Hive2基础搭建（记录）
安装hive之前先搭建好hadoop集群、mysql元数据库
软件准备
到官网下载hive软件包apache-hive-2.3.2-bin.tar.gz
安装
tar -xivf apache-hive-2.3.2-bin.tar.gz -C /usr/local
mv apache-hive-2.3.2-bin hive2
配置hive-env.sh
export JAVA_HOME=/usr/local/jdk1.8.0_121
export HADOOP_HOM=/usr/local/hadoop
export HIVE_HOME=/usr/local/hive2
export HIVE_CONF_DIR=/usr/local/hive2/conf
export HADOOP_HEAPSIZE=4096
配置hive-site.xml
#
# tez.lib.uris
# ${fs.default.name}/apps/apache-tez-0.9.0-bin.tar.gz
#
hive.exec.script.wrapper
hive.exec.plan
hive.exec.stagingdir
.hive-staging
Directory name that will be created inside table locations in order to support HDFS encryption. This is replaces ${hive.exec.scratchdir} for query results with the exception of read-only tables. In all cases ${hive.exec.scratchdir} is still used for other temporary files, such as job plans.
hive.exec.scratchdir
/user/hive/tmp
HDFS root scratch dir for Hive jobs which gets created with write all (733) permission. For each connecting user, an HDFS scratch dir: ${hive.exec.scratchdir}/<username> is created, with ${hive.scratch.dir.permission}.
hive.repl.rootdir
/user/hive/repl/
HDFS root dir for all replication dumps.
hive.repl.cm.enabled
false
Turn on ChangeManager, so delete files will go to cmrootdir.
hive.repl.cmrootdir
/user/hive/cmroot/
Root dir for ChangeManager, used for deleted files.
hive.repl.cm.retain
24h
Expects a time value with unit (d/day, h/hour, m/min, s/sec, ms/msec, us/usec, ns/nsec), which is hour if not specified.
Time to retain removed files in cmrootdir.
hive.repl.cm.interval
3600s
Expects a time value with unit (d/day, h/hour, m/min, s/sec, ms/msec, us/usec, ns/nsec), which is sec if not specified.
Inteval for cmroot cleanup thread.
hive.exec.local.scratchdir
/bak/hive
Local scratch space for Hive jobs
hive.downloaded.resources.dir
/bak/hive/resources
Temporary local directory for added resources in the remote file system.
hive.scratch.dir.permission
700
The permission for the user specific scratch directories that get created.
hive.exec.submitviachild
false
hive.exec.submit.local.task.via.child
true
Determines whether local tasks (typically mapjoin hashtable generation phase) runs in
separate JVM (true recommended) or not.
Avoids the overhead of spawning new JVM, but can lead to out-of-memory issues.
hive.exec.script.maxerrsize
100000
Maximum number of bytes a script is allowed to emit to standard error (per map-reduce task).
This prevents runaway scripts from filling logs partitions to capacity
hive.exec.script.allow.partial.consumption
false
When enabled, this option allows a user script to exit successfully without consuming
all the data from the standard input.
stream.stderr.reporter.prefix
reporter:
Streaming jobs that log to standard error with this prefix can log counter or status information.
stream.stderr.reporter.enabled
true
Enable consumption of status and counter messages for streaming jobs.
hive.exec.compress.output
false
This controls whether the final outputs of a query (to a local/HDFS file or a Hive table) is compressed.
The compression codec and other options are determined from Hadoop config variables mapred.output.compress*
hive.exec.compress.intermediate
false
This controls whether intermediate files produced by Hive between multiple map-reduce jobs are compressed.
The compression codec and other options are determined from Hadoop config variables mapred.output.compress*
hive.intermediate.compression.codec
hive.intermediate.compression.type
hive.exec.reducers.bytes.per.reducer
256000000
size per reducer.The default is 256Mb, i.e if the input size is 1G, it will use 4 reducers.
hive.exec.reducers.max
1009
max number of reducers will be used. If the one specified in the configuration parameter mapred.reduce.tasks is
negative, Hive will use this one as the max number of reducers when automatically determine number of reducers.
hive.exec.pre.hooks
Comma-separated list of pre-execution hooks to be invoked for each statement.
A pre-execution hook is specified as the name of a Java class which implements the
org.apache.hadoop.hive.ql.hooks.ExecuteWithHookContext interface.
hive.exec.post.hooks
Comma-separated list of post-execution hooks to be invoked for each statement.
A post-execution hook is specified as the name of a Java class which implements the
org.apache.hadoop.hive.ql.hooks.ExecuteWithHookContext interface.
hive.exec.failure.hooks
Comma-separated list of on-failure hooks to be invoked for each statement.
An on-failure hook is specified as the name of Java class which implements the
org.apache.hadoop.hive.ql.hooks.ExecuteWithHookContext interface.
hive.exec.query.redactor.hooks
Comma-separated list of hooks to be invoked for each query which can
tranform the query before it's placed in the job.xml file. Must be a Java class which
extends from the org.apache.hadoop.hive.ql.hooks.Redactor abstract class.
hive.client.stats.publishers
Comma-separated list of statistics publishers to be invoked on counters on each job.
A client stats publisher is specified as the name of a Java class which implements the
org.apache.hadoop.hive.ql.stats.ClientStatsPublisher interface.
hive.ats.hook.queue.capacity
64
Queue size for the ATS Hook executor. If the number of outstanding submissions
to the ATS executor exceed this amount, the Hive ATS Hook will not try to log queries to ATS.
hive.exec.parallel
false
Whether to execute jobs in parallel
hive.exec.parallel.thread.number
8
How many jobs at most can be executed in parallel
hive.mapred.reduce.tasks.speculative.execution
true
Whether speculative execution for reducers should be turned on.
hive.exec.counters.pull.interval
1000
The interval with which to poll the JobTracker for the counters the running job.
The smaller it is the more load there will be on the jobtracker, the higher it is the less granular the caught will be.
hive.exec.dynamic.partition
true
Whether or not to allow dynamic partitions in DML/DDL.
hive.exec.dynamic.partition.mode
nonstrict
In strict mode, the user must specify at least one static partition
in case the user accidentally overwrites all partitions.
In nonstrict mode all partitions are allowed to be dynamic.
hive.exec.max.dynamic.partitions
1000
Maximum number of dynamic partitions allowed to be created in total.
hive.exec.max.dynamic.partitions.pernode
100
Maximum number of dynamic partitions allowed to be created in each mapper/reducer node.
hive.exec.max.created.files
100000
Maximum number of HDFS files created by all mappers/reducers in a MapReduce job.
hive.exec.default.partition.name
__HIVE_DEFAULT_PARTITION__
The default partition name in case the dynamic partition column value is null/empty string or any other values that cannot be escaped.
This value must not contain any special character used in HDFS URI (e.g., ':', '%', '/' etc).
The user has to be aware that the dynamic partition value should not contain this value to avoid confusions.
hive.lockmgr.zookeeper.default.partition.name
__HIVE_DEFAULT_ZOOKEEPER_PARTITION__
hive.exec.show.job.failure.debug.info
true
If a job fails, whether to provide a link in the CLI to the task with the
most failures, along with debugging hints if applicable.
hive.exec.job.debug.capture.stacktraces
true
Whether or not stack traces parsed from the task logs of a sampled failed task
for each failed job should be stored in the SessionState
hive.exec.job.debug.timeout
30000
hive.exec.tasklog.debug.timeout
20000
hive.output.file.extension
String used as a file extension for output files.
If not set, defaults to the codec extension for text files (e.g. ".gz"), or no extension otherwise.
hive.exec.mode.local.auto
false
Let Hive determine whether to run in local mode automatically
hive.exec.mode.local.auto.inputbytes.max
134217728
When hive.exec.mode.local.auto is true, input bytes should less than this for local mode.
hive.exec.mode.local.auto.input.files.max
4
When hive.exec.mode.local.auto is true, the number of tasks should less than this for local mode.
hive.exec.drop.ignorenonexistent
true
Do not report an error if DROP TABLE/VIEW/Index/Function specifies a non-existent table/view/index/function
hive.ignore.mapjoin.hint
true
Ignore the mapjoin hint
hive.file.max.footer
100
maximum number of lines for footer user can define for a table file
hive.resultset.use.unique.column.names
true
Make column names unique in the result set by qualifying column names with table alias if needed.
Table alias will be added to column names for queries of type "select *" or
if query explicitly uses table alias "select r1.x..".
fs.har.impl
org.apache.hadoop.hive.shims.HiveHarFileSystem
The implementation for accessing Hadoop Archives. Note that this won't be applicable to Hadoop versions less than 0.20
hive.metastore.warehouse.dir
/user/hive/warehouse
location of default database for the warehouse
hive.metastore.uris
thrift://10.242.154.186:9083,thrift://10.242.154.186:9084,thrift://10.242.154.186:9085
Thrift URI for the remote metastore. Used by metastore client to connect to remote metastore.
hive.metastore.client.capability.check
true
Whether to check client capabilities for potentially breaking API usage.
hive.metastore.fastpath
false
Used to avoid all of the proxies and object copies in the metastore. Note, if this is set, you MUST use a local metastore (hive.metastore.uris must be empty) otherwise undefined and most likely undesired behavior will result
hive.metastore.fshandler.threads
15
Number of threads to be allocated for metastore handler for fs operations.
hive.metastore.hbase.catalog.cache.size
50000
Maximum number of objects we will place in the hbase metastore catalog cache. The objects will be divided up by types that we need to cache.
hive.metastore.hbase.aggregate.stats.cache.size
10000
Maximum number of aggregate stats nodes that we will place in the hbase metastore aggregate stats cache.
hive.metastore.hbase.aggregate.stats.max.partitions
10000
Maximum number of partitions that are aggregated per cache node.
hive.metastore.hbase.aggregate.stats.false.positive.probability
0.01
Maximum false positive probability for the Bloom Filter used in each aggregate stats cache node (default 1%).
hive.metastore.hbase.aggregate.stats.max.variance
0.1
Maximum tolerable variance in number of partitions between a cached node and our request (default 10%).
hive.metastore.hbase.cache.ttl
600s
Expects a time value with unit (d/day, h/hour, m/min, s/sec, ms/msec, us/usec, ns/nsec), which is sec if not specified.
Number of seconds for a cached node to be active in the cache before they become stale.
hive.metastore.hbase.cache.max.writer.wait
5000ms
Expects a time value with unit (d/day, h/hour, m/min, s/sec, ms/msec, us/usec, ns/nsec), which is msec if not specified.
Number of milliseconds a writer will wait to acquire the writelock before giving up.
hive.metastore.hbase.cache.max.reader.wait
1000ms
Expects a time value with unit (d/day, h/hour, m/min, s/sec, ms/msec, us/usec, ns/nsec), which is msec if not specified.
Number of milliseconds a reader will wait to acquire the readlock before giving up.
hive.metastore.hbase.cache.max.full
0.9
Maximum cache full % after which the cache cleaner thread kicks in.
hive.metastore.hbase.cache.clean.until
0.8
The cleaner thread cleans until cache reaches this % full size.
hive.metastore.hbase.connection.class
org.apache.hadoop.hive.metastore.hbase.VanillaHBaseConnection
Class used to connection to HBase
hive.metastore.hbase.aggr.stats.cache.entries
10000
How many in stats objects to cache in memory
hive.metastore.hbase.aggr.stats.memory.ttl
60s
Expects a time value with unit (d/day, h/hour, m/min, s/sec, ms/msec, us/usec, ns/nsec), which is sec if not specified.
Number of seconds stats objects live in memory after they are read from HBase.
hive.metastore.hbase.aggr.stats.invalidator.frequency
5s
Expects a time value with unit (d/day, h/hour, m/min, s/sec, ms/msec, us/usec, ns/nsec), which is sec if not specified.
How often the stats cache scans its HBase entries and looks for expired entries
hive.metastore.hbase.aggr.stats.hbase.ttl
604800s
Expects a time value with unit (d/day, h/hour, m/min, s/sec, ms/msec, us/usec, ns/nsec), which is sec if not specified.
Number of seconds stats entries live in HBase cache after they are created. They may be invalided by updates or partition drops before this. Default is one week.
hive.metastore.hbase.file.metadata.threads
1
Number of threads to use to read file metadata in background to cache it.
hive.metastore.connect.retries
3
Number of retries while opening a connection to metastore
hive.metastore.failure.retries
1
Number of retries upon failure of Thrift metastore calls
hive.metastore.port
9083
Hive metastore listener port
hive.metastore.client.connect.retry.delay
1s
Expects a time value with unit (d/day, h/hour, m/min, s/sec, ms/msec, us/usec, ns/nsec), which is sec if not specified.
Number of seconds for the client to wait between consecutive connection attempts
hive.metastore.client.socket.timeout
600s
Expects a time value with unit (d/day, h/hour, m/min, s/sec, ms/msec, us/usec, ns/nsec), which is sec if not specified.
MetaStore Client socket timeout in seconds
hive.metastore.client.socket.lifetime
0s
Expects a time value with unit (d/day, h/hour, m/min, s/sec, ms/msec, us/usec, ns/nsec), which is sec if not specified.
MetaStore Client socket lifetime in seconds. After this time is exceeded, client
reconnects on the next MetaStore operation. A value of 0s means the connection
has an infinite lifetime.
javax.jdo.option.ConnectionPassword
hivepw
password to use against metastore database
hive.metastore.ds.connection.url.hook
Name of the hook to use for retrieving the JDO connection URL. If empty, the value in javax.jdo.option.ConnectionURL is used
javax.jdo.option.Multithreaded
true
Set this to true if multiple threads access metastore through JDO concurrently.
javax.jdo.option.ConnectionURL
jdbc:mysql://10.242.126.25:3306/hive_metadata?createDatabaseIfNotExist=true
JDBC connect string for a JDBC metastore.
To use SSL to encrypt/authenticate the connection, provide database-specific SSL flag in the connection URL.
For example, jdbc:postgresql://myhost/db?ssl=true for postgres database.
hive.metastore.dbaccess.ssl.properties
Comma-separated SSL properties for metastore to access database when JDO connection URL
enables SSL access. e.g. javax.net.ssl.trustStore=/tmp/truststore,javax.net.ssl.trustStorePassword=pwd.
hive.hmshandler.retry.attempts
10
The number of times to retry a HMSHandler call if there were a connection error.
hive.hmshandler.retry.interval
2000ms
Expects a time value with unit (d/day, h/hour, m/min, s/sec, ms/msec, us/usec, ns/nsec), which is msec if not specified.
The time between HMSHandler retry attempts on failure.
hive.hmshandler.force.reload.conf
false
Whether to force reloading of the HMSHandler configuration (including
the connection URL, before the next metastore query that accesses the
datastore. Once reloaded, this value is reset to false. Used for
testing only.
hive.metastore.server.max.message.size
104857600
Maximum message size in bytes a HMS will accept.
hive.metastore.server.min.threads
200
Minimum number of worker threads in the Thrift server's pool.
hive.metastore.server.max.threads
1000
Maximum number of worker threads in the Thrift server's pool.
hive.metastore.server.tcp.keepalive
true
Whether to enable TCP keepalive for the metastore server. Keepalive will prevent accumulation of half-open connections.
hive.metastore.archive.intermediate.original
_INTERMEDIATE_ORIGINAL
Intermediate dir suffixes used for archiving. Not important what they
are, as long as collisions are avoided
hive.metastore.archive.intermediate.archived
_INTERMEDIATE_ARCHIVED
hive.metastore.archive.intermediate.extracted
_INTERMEDIATE_EXTRACTED
hive.metastore.kerberos.keytab.file
The path to the Kerberos Keytab file containing the metastore Thrift server's service principal.
hive.metastore.kerberos.principal
hive-metastore/[email protected]
The service principal for the metastore Thrift server.
The special string _HOST will be replaced automatically with the correct host name.
hive.metastore.sasl.enabled
false
If true, the metastore Thrift interface will be secured with SASL. Clients must authenticate with Kerberos.
hive.metastore.thrift.framed.transport.enabled
false
If true, the metastore Thrift interface will use TFramedTransport. When false (default) a standard TTransport is used.
hive.metastore.thrift.compact.protocol.enabled
false
If true, the metastore Thrift interface will use TCompactProtocol. When false (default) TBinaryProtocol will be used.
Setting it to true will break compatibility with older clients running TBinaryProtocol.
hive.metastore.token.signature
The delegation token service name to match when selecting a token from the current user's tokens.
hive.cluster.delegation.token.store.class
org.apache.hadoop.hive.thrift.MemoryTokenStore
The delegation token store implementation. Set to org.apache.hadoop.hive.thrift.ZooKeeperTokenStore for load-balanced cluster.
hive.cluster.delegation.token.store.zookeeper.connectString
The ZooKeeper token store connect string. You can re-use the configuration value
set in hive.zookeeper.quorum, by leaving this parameter unset.
hive.cluster.delegation.token.store.zookeeper.znode
/hivedelegation
The root path for token store data. Note that this is used by both HiveServer2 and
MetaStore to store delegation Token. One directory gets created for each of them.
The final directory names would have the servername appended to it (HIVESERVER2,
METASTORE).
hive.cluster.delegation.token.store.zookeeper.acl
ACL for token store entries. Comma separated list of ACL entries. For example:
sasl:hive/[email protected]:cdrwa,sasl:hive/[email protected]:cdrwa
Defaults to all permissions for the hiveserver2/metastore process user.
hive.metastore.cache.pinobjtypes
Table,StorageDescriptor,SerDeInfo,Partition,Database,Type,FieldSchema,Order
List of comma separated metastore object types that should be pinned in the cache
datanucleus.connectionPoolingType
BONECP
Expects one of [bonecp, dbcp, hikaricp, none].
Specify connection pool library for datanucleus
datanucleus.connectionPool.maxPoolSize
10
Specify the maximum number of connections in the connection pool. Note: The configured size will be used by
2 connection pools (TxnHandler and ObjectStore). When configuring the max connection pool size, it is
recommended to take into account the number of metastore instances and the number of HiveServer2 instances
configured with embedded metastore. To get optimal performance, set config to meet the following condition
(2 * pool_size * metastore_instances + 2 * pool_size * HS2_instances_with_embedded_metastore) =
(2 * physical_core_count + hard_disk_count).
datanucleus.rdbms.initializeColumnInfo
NONE
initializeColumnInfo setting for DataNucleus; set to NONE at least on Postgres.
datanucleus.schema.validateTables
false
validates existing schema against code. turn this on if you want to verify existing schema
datanucleus.schema.validateColumns
false
validates existing schema against code. turn this on if you want to verify existing schema
datanucleus.schema.validateConstraints
false
validates existing schema against code. turn this on if you want to verify existing schema
datanucleus.storeManagerType
rdbms
metadata store type
datanucleus.schema.autoCreateAll
false
Auto creates necessary schema on a startup if one doesn't exist. Set this to false, after creating it once.To enable auto create also set hive.metastore.schema.verification=false. Auto creation is not recommended for production use cases, run schematool command instead.
hive.metastore.schema.verification
true
Enforce metastore schema version consistency.
True: Verify that version information stored in is compatible with one from Hive jars. Also disable automatic
schema migration attempt. Users are required to manually migrate schema after Hive upgrade which ensures
proper metastore schema migration. (Default)
False: Warn if the version information stored in metastore doesn't match with one from in Hive jars.
hive.metastore.schema.verification.record.version
false
When true the current MS version is recorded in the VERSION table. If this is disabled and verification is
enabled the MS will be unusable.
datanucleus.transactionIsolation
read-committed
Default transaction isolation level for identity generation.
datanucleus.cache.level2
false
Use a level 2 cache. Turn this off if metadata is changed independently of Hive metastore server
datanucleus.cache.level2.type
none
datanucleus.identifierFactory
datanucleus1
Name of the identifier factory to use when generating table/column names etc.
'datanucleus1' is used for backward compatibility with DataNucleus v1
datanucleus.rdbms.useLegacyNativeValueStrategy
true
datanucleus.plugin.pluginRegistryBundleCheck
LOG
Defines what happens when plugin bundles are found and are duplicated [EXCEPTION|LOG|NONE]
hive.metastore.batch.retrieve.max
300
Maximum number of objects (tables/partitions) can be retrieved from metastore in one batch.
The higher the number, the less the number of round trips is needed to the Hive metastore server,
but it may also cause higher memory requirement at the client side.
hive.metastore.batch.retrieve.table.partition.max
1000
Maximum number of objects that metastore internally retrieves in one batch.
hive.metastore.init.hooks
A comma separated list of hooks to be invoked at the beginning of HMSHandler initialization.
An init hook is specified as the name of Java class which extends org.apache.hadoop.hive.metastore.MetaStoreInitListener.
hive.metastore.pre.event.listeners
List of comma separated listeners for metastore events.
hive.metastore.event.listeners
A comma separated list of Java classes that implement the org.apache.hadoop.hive.metastore.MetaStoreEventListener interface. The metastore event and corresponding listener method will be invoked in separate JDO transactions. Alternatively, configure hive.metastore.transactional.event.listeners to ensure both are invoked in same JDO transaction.
hive.metastore.transactional.event.listeners
A comma separated list of Java classes that implement the org.apache.hadoop.hive.metastore.MetaStoreEventListener interface. Both the metastore event and corresponding listener method will be invoked in the same JDO transaction.
hive.metastore.event.db.listener.timetolive
86400s
Expects a time value with unit (d/day, h/hour, m/min, s/sec, ms/msec, us/usec, ns/nsec), which is sec if not specified.
time after which events will be removed from the database listener queue
hive.metastore.authorization.storage.checks
false
Should the metastore do authorization checks against the underlying storage (usually hdfs)
for operations like drop-partition (disallow the drop-partition if the user in
question doesn't have permissions to delete the corresponding directory
on the storage).
hive.metastore.authorization.storage.check.externaltable.drop
true
Should StorageBasedAuthorization check permission of the storage before dropping external table.
StorageBasedAuthorization already does this check for managed table. For external table however,
anyone who has read permission of the directory could drop external table, which is surprising.
The flag is set to false by default to maintain backward compatibility.
hive.metastore.event.clean.freq
0s
Expects a time value with unit (d/day, h/hour, m/min, s/sec, ms/msec, us/usec, ns/nsec), which is sec if not specified.
Frequency at which timer task runs to purge expired events in metastore.
hive.metastore.event.expiry.duration
0s
Expects a time value with unit (d/day, h/hour, m/min, s/sec, ms/msec, us/usec, ns/nsec), which is sec if not specified.
Duration after which events expire from events table
hive.metastore.event.message.factory
org.apache.hadoop.hive.metastore.messaging.json.JSONMessageFactory
Factory class for making encoding and decoding messages in the events generated.
hive.metastore.execute.setugi
true
In unsecure mode, setting this property to true will cause the metastore to execute DFS operations using
the client's reported user and group permissions. Note that this property must be set on
both the client and server sides. Further note that its best effort.
If client sets its to true and server sets it to false, client setting will be ignored.
hive.metastore.partition.name.whitelist.pattern
Partition names will be checked against this regex pattern and rejected if not matched.
hive.metastore.integral.jdo.pushdown
false
Allow JDO query pushdown for integral partition columns in metastore. Off by default. This
improves metastore perf for integral columns, especially if there's a large number of partitions.
However, it doesn't work correctly with integral values that are not normalized (e.g. have
leading zeroes, like 0012). If metastore direct SQL is enabled and works, this optimization
is also irrelevant.
hive.metastore.try.direct.sql
true
Whether the Hive metastore should try to use direct SQL queries instead of the
DataNucleus for certain read paths. This can improve metastore performance when
fetching many partitions or column statistics by orders of magnitude; however, it
is not guaranteed to work on all RDBMS-es and all versions. In case of SQL failures,
the metastore will fall back to the DataNucleus, so it's safe even if SQL doesn't
work for all queries on your datastore. If all SQL queries fail (for example, your
metastore is backed by MongoDB), you might want to disable this to save the
try-and-fall-back cost.
hive.metastore.direct.sql.batch.size
0
Batch size for partition and other object retrieval from the underlying DB in direct
SQL. For some DBs like Oracle and MSSQL, there are hardcoded or perf-based limitations
that necessitate this. For DBs that can handle the queries, this isn't necessary and
may impede performance. -1 means no batching, 0 means automatic batching.
hive.metastore.try.direct.sql.ddl
true
Same as hive.metastore.try.direct.sql, for read statements within a transaction that
modifies metastore data. Due to non-standard behavior in Postgres, if a direct SQL
select query has incorrect syntax or something similar inside a transaction, the
entire transaction will fail and fall-back to DataNucleus will not be possible. You
should disable the usage of direct SQL inside transactions if that happens in your case.
hive.direct.sql.max.query.length
100
The maximum
size of a query string (in KB).
hive.direct.sql.max.elements.in.clause
1000
The maximum number of values in a IN clause. Once exceeded, it will be broken into
multiple OR separated IN clauses.
hive.direct.sql.max.elements.values.clause
1000
The maximum number of values in a VALUES clause for INSERT statement.
hive.metastore.orm.retrieveMapNullsAsEmptyStrings
false
Thrift does not support nulls in maps, so any nulls present in maps retrieved from ORM must either be pruned or converted to empty strings. Some backing dbs such as Oracle persist empty strings as nulls, so we should set this parameter if we wish to reverse that behaviour. For others, pruning is the correct behaviour
hive.metastore.disallow.incompatible.col.type.changes
true
If true (default is false), ALTER TABLE operations which change the type of a
column (say STRING) to an incompatible type (say MAP) are disallowed.
RCFile default SerDe (ColumnarSerDe) serializes the values in such a way that the
datatypes can be converted from string to any type. The map is also serialized as
a string, which can be read as a string as well. However, with any binary
serialization, this is not true. Blocking the ALTER TABLE prevents ClassCastExceptions
when subsequently trying to access old partitions.
Primitive types like INT, STRING, BIGINT, etc., are compatible with each other and are
not blocked.
See HIVE-4409 for more details.
hive.metastore.limit.partition.request
-1
This limits the number of partitions that can be requested from the metastore for a given table.
The default value "-1" means no limit.
hive.table.parameters.default
Default property values for newly created tables
hive.ddl.createtablelike.properties.whitelist
Table Properties to copy over when executing a Create Table Like.
hive.metastore.rawstore.impl
org.apache.hadoop.hive.metastore.ObjectStore
Name of the class that implements org.apache.hadoop.hive.metastore.rawstore interface.
This class is used to store and retrieval of raw metadata objects such as table, database
hive.metastore.txn.store.impl
org.apache.hadoop.hive.metastore.txn.CompactionTxnHandler
Name of class that implements org.apache.hadoop.hive.metastore.txn.TxnStore. This class is used to store and retrieve transactions and locks
javax.jdo.option.ConnectionDriverName
com.mysql.jdbc.Driver
Driver class name for a JDBC metastore
javax.jdo.PersistenceManagerFactoryClass
org.datanucleus.api.jdo.JDOPersistenceManagerFactory
class implementing the jdo persistence
hive.metastore.expression.proxy
org.apache.hadoop.hive.ql.optimizer.ppr.PartitionExpressionForMetastore
javax.jdo.option.DetachAllOnCommit
true
Detaches all objects from session so that they can be used after transaction is committed
javax.jdo.option.NonTransactionalRead
true
Reads outside of transactions
javax.jdo.option.ConnectionUserName
husr
Username to use against metastore database
hive.metastore.end.function.listeners
List of comma separated listeners for the end of metastore functions.
hive.metastore.partition.inherit.table.properties
List of comma separated keys occurring in table properties which will get inherited to newly created partitions.
* implies all the keys will get inherited.
hive.metastore.filter.hook
org.apache.hadoop.hive.metastore.DefaultMetaStoreFilterHookImpl
Metastore hook class for filtering the metadata read results. If hive.security.authorization.manageris set to instance of HiveAuthorizerFactory, then this value is ignored.
hive.metastore.dml.events
false
If true, the metastore will be asked to fire events for DML operations
hive.metastore.client.drop.partitions.using.expressions
true
Choose whether dropping partitions with HCatClient pushes the partition-predicate to the metastore, or drops partitions iteratively
hive.metastore.aggregate.stats.cache.enabled
true
Whether aggregate stats caching is enabled or not.
hive.metastore.aggregate.stats.cache.size
10000
Maximum number of aggregate stats nodes that we will place in the metastore aggregate stats cache.
hive.metastore.aggregate.stats.cache.max.partitions
10000
Maximum number of partitions that are aggregated per cache node.
hive.metastore.aggregate.stats.cache.fpp
0.01
Maximum false positive probability for the Bloom Filter used in each aggregate stats cache node (default 1%).
hive.metastore.aggregate.stats.cache.max.variance
0.01
Maximum tolerable variance in number of partitions between a cached node and our request (default 1%).
hive.metastore.aggregate.stats.cache.ttl
600s
Expects a time value with unit (d/day, h/hour, m/min, s/sec, ms/msec, us/usec, ns/nsec), which is sec if not specified.
Number of seconds for a cached node to be active in the cache before they become stale.
hive.metastore.aggregate.stats.cache.max.writer.wait
5000ms
Expects a time value with unit (d/day, h/hour, m/min, s/sec, ms/msec, us/usec, ns/nsec), which is msec if not specified.
Number of milliseconds a writer will wait to acquire the writelock before giving up.
hive.metastore.aggregate.stats.cache.max.reader.wait
1000ms
Expects a time value with unit (d/day, h/hour, m/min, s/sec, ms/msec, us/usec, ns/nsec), which is msec if not specified.
Number of milliseconds a reader will wait to acquire the readlock before giving up.
hive.metastore.aggregate.stats.cache.max.full
0.9
Maximum cache full % after which the cache cleaner thread kicks in.
hive.metastore.aggregate.stats.cache.clean.until
0.8
The cleaner thread cleans until cache reaches this % full size.
hive.metastore.metrics.enabled
false
Enable metrics on the metastore.
hive.metastore.initial.metadata.count.enabled
true
Enable a metadata count at metastore startup for metrics.
hive.metastore.use.SSL
false
Set this to true for using SSL encryption in HMS server.
hive.metastore.keystore.path
Metastore SSL certificate keystore location.
hive.metastore.keystore.password
Metastore SSL certificate keystore password.
hive.metastore.truststore.path
Metastore SSL certificate truststore location.
hive.metastore.truststore.password
Metastore SSL certificate truststore password.
hive.metadata.export.location
When used in conjunction with the org.apache.hadoop.hive.ql.parse.MetaDataExportListener pre event listener,
it is the location to which the metadata will be exported. The default is an empty string, which results in the
metadata being exported to the current user's home directory on HDFS.
hive.metadata.move.exported.metadata.to.trash
true
When used in conjunction with the org.apache.hadoop.hive.ql.parse.MetaDataExportListener pre event listener,
this setting determines if the metadata that is exported will subsequently be moved to the user's trash directory
alongside the dropped table data. This ensures that the metadata will be cleaned up along with the dropped table data.
hive.cli.errors.ignore
false
hive.cli.print.current.db
false
Whether to include the current database in the Hive prompt.
hive.cli.prompt
hive
Command line prompt configuration value. Other hiveconf can be used in this configuration value.
Variable substitution will only be invoked at the Hive CLI startup.
hive.cli.pretty.output.num.cols
-1
The number of columns to use when formatting output generated by the DESCRIBE PRETTY table_name command.
If the value of this property is -1, then Hive will use the auto-detected terminal width.
hive.metastore.fs.handler.class
org.apache.hadoop.hive.metastore.HiveMetaStoreFsImpl
hive.session.id
hive.session.silent
false
hive.session.history.enabled
false
Whether to log Hive query, query plan, runtime statistics etc.
hive.query.string
Query being executed (might be multiple per a session)
hive.query.id
ID for query being executed (might be multiple per a session)
hive.jobname.length
50
max jobname length
hive.jar.path
The location of hive_cli.jar that is used when submitting jobs in a separate jvm.
hive.aux.jars.path
The location of the plugin jars that contain implementations of user defined functions and serdes.
hive.reloadable.aux.jars.path
The locations of the plugin jars, which can be a comma-separated folders or jars. Jars can be renewed
by executing reload command. And these jars can be used as the auxiliary classes like creating a UDF or SerDe.
hive.added.files.path
This an internal parameter.
hive.added.jars.path
This an internal parameter.
hive.added.archives.path
This an internal parameter.
hive.auto.progress.timeout
0s
Expects a time value with unit (d/day, h/hour, m/min, s/sec, ms/msec, us/usec, ns/nsec), which is sec if not specified.
How long to run autoprogressor for the script/UDTF operators.
Set to 0 for forever.
hive.script.auto.progress
false
Whether Hive Transform/Map/Reduce Clause should automatically send progress information to TaskTracker
to avoid the task getting killed because of inactivity. Hive sends progress information when the script is
outputting to stderr. This option removes the need of periodically producing stderr messages,
but users should be cautious because this may prevent infinite loops in the scripts to be killed by TaskTracker.
hive.script.operator.id.env.var
HIVE_SCRIPT_OPERATOR_ID
Name of the environment variable that holds the unique script operator ID in the user's
transform function (the custom mapper/reducer that the user has specified in the query)
hive.script.operator.truncate.env
false
Truncate each environment variable for external script in scripts operator to 20KB (to fit system limits)
hive.script.operator.env.blacklist
hive.txn.valid.txns,hive.script.operator.env.blacklist
Comma separated list of keys from the configuration file not to convert to environment variables when envoking the script operator
hive.strict.checks.large.query
false
Enabling strict large query checks disallows the following:
Orderby without limit.
No partition being picked up for a query against partitioned table.
Note that these checks currently do not consider data size, only the query pattern.
hive.strict.checks.type.safety
true
Enabling strict type safety checks disallows the following:
Comparing bigints and strings.
Comparing bigints and doubles.
hive.strict.checks.cartesian.product
true
Enabling strict Cartesian join checks disallows the following:
Cartesian product (cross join).
hive.strict.checks.bucketing
true
Enabling strict bucketing checks disallows the following:
Load into bucketed tables.
hive.mapred.mode
Deprecated; use hive.strict.checks.* settings instead.
hive.alias
hive.map.aggr
true
Whether to use map-side aggregation in Hive Group By queries
hive.groupby.skewindata
false
Whether there is skew in data to optimize group by queries
hive.join.emit.interval
1000
How many rows in the right-most join operand Hive should buffer before emitting the join result.
hive.join.cache.size
25000
How many rows in the joining tables (except the streaming table) should be cached in memory.
hive.cbo.enable
true
Flag to control enabling Cost Based Optimizations using Calcite framework.
hive.cbo.cnf.maxnodes
-1
When converting to conjunctive normal form (CNF), fail ifthe expression exceeds this threshold; the threshold is expressed in terms of number of nodes (leaves andinterior nodes). -1 to not set up a threshold.
hive.cbo.returnpath.hiveop
false
Flag to control calcite plan to hive operator conversion
hive.cbo.costmodel.extended
false
Flag to control enabling the extended cost model based onCPU, IO and cardinality. Otherwise, the cost model is based on cardinality.
hive.cbo.costmodel.cpu
0.000001
Default cost of a comparison
hive.cbo.costmodel.network
150.0
Default cost of a transfering a byte over network; expressed as multiple of CPU cost
hive.cbo.costmodel.local.fs.write
4.0
Default cost of writing a byte to local FS; expressed as multiple of NETWORK cost
hive.cbo.costmodel.local.fs.read
4.0
Default cost of reading a byte from local FS; expressed as multiple of NETWORK cost
hive.cbo.costmodel.hdfs.write
10.0
Default cost of writing a byte to HDFS; expressed as multiple of Local FS write cost
hive.cbo.costmodel.hdfs.read
1.5
Default cost of reading a byte from HDFS; expressed as multiple of Local FS read cost
hive.cbo.show.warnings
true
Toggle display of CBO warnings like missing column stats
hive.transpose.aggr.join
false
push aggregates through join
hive.optimize.semijoin.conversion
true
convert group by followed by inner equi join into semijoin
hive.order.columnalignment
true
Flag to control whether we want to try to aligncolumns in operators such as Aggregate or Join so that we try to reduce the number of shuffling stages
hive.materializedview.rewriting
false
Whether to try to rewrite queries using the materialized views enabled for rewriting
hive.materializedview.fileformat
ORC
Expects one of [none, textfile, sequencefile, rcfile, orc].
Default file format for CREATE MATERIALIZED VIEW statement
hive.materializedview.serde
org.apache.hadoop.hive.ql.io.orc.OrcSerde
Default SerDe used for materialized views
hive.mapjoin.bucket.cache.size
100
hive.mapjoin.optimized.hashtable
true
Whether Hive should use memory-optimized hash table for MapJoin.
Only works on Tez and Spark, because memory-optimized hashtable cannot be serialized.
hive.mapjoin.optimized.hashtable.probe.percent
0.5
Probing space percentage of the optimized hashtable
hive.mapjoin.hybridgrace.hashtable
true
Whether to use hybridgrace hash join as the join method for mapjoin. Tez only.
hive.mapjoin.hybridgrace.memcheckfrequency
1024
For hybrid grace hash join, how often (how many rows apart) we check if memory is full. This number should be power of 2.
hive.mapjoin.hybridgrace.minwbsize
524288
For hybrid graceHash join, the minimum write buffer size used by optimized hashtable. Default is 512 KB.
hive.mapjoin.hybridgrace.minnumpartitions
16
ForHybrid grace hash join, the minimum number of partitions to create.
hive.mapjoin.optimized.hashtable.wbsize
8388608
Optimized hashtable (see hive.mapjoin.optimized.hashtable) uses a chain of buffers to
store data. This is one buffer size. HT may be slightly faster if this is larger, but for small
joins unnecessary memory will be allocated and then trimmed.
hive.mapjoin.hybridgrace.bloomfilter
true
Whether to use BloomFilter in Hybrid grace hash join to minimize unnecessary spilling.
hive.smbjoin.cache.rows
10000
How many rows with the same key value should be cached in memory per smb joined table.
hive.groupby.mapaggr.checkinterval
100000
Number of rows after which size of the grouping keys/aggregation classes is performed
hive.map.aggr.hash.percentmemory
0.5
Portion of total memory to be used by map-side group aggregation hash table
hive.mapjoin.followby.map.aggr.hash.percentmemory
0.3
Portion of total memory to be used by map-side group aggregation hash table, when this group by is followed by map join
hive.map.aggr.hash.force.flush.memory.threshold
0.9
The max memory to be used by map-side group aggregation hash table.
If the memory usage is higher than this number, force to flush data
hive.map.aggr.hash.min.reduction
0.5
Hash aggregation will be turned off if the ratio between hash table size and input rows is bigger than this number.
Set to 1 to make sure hash aggregation is never turned off.
hive.multigroupby.singlereducer
true
Whether to optimize multi group by query to generate single M/R job plan. If the multi group by query has
common group by keys, it will be optimized to generate single M/R job.
hive.map.groupby.sorted
true
If the bucketing/sorting properties of the table exactly match the grouping key, whether to perform
the group by in the mapper by using BucketizedHiveInputFormat. The only downside to this
is that it limits the number of mappers to the number of files.
hive.groupby.position.alias
false
Whether to enable using Column Position Alias in Group By
hive.orderby.position.alias
true
Whether to enable using Column Position Alias in Order By
hive.groupby.orderby.position.alias
false
Whether to enable using Column Position Alias in Group By or Order By (deprecated).
Use hive.orderby.position.alias or hive.groupby.position.alias instead
hive.new.job.grouping.set.cardinality
30
Whether a new map-reduce job should be launched for grouping sets/rollups/cubes.
For a query like: select a, b, c, count(1) from T group by a, b, c with rollup;
4 rows are created per row: (a, b, c), (a, b, null), (a, null, null), (null, null, null).
This can lead to explosion across map-reduce boundary if the cardinality of T is very high,
and map-side aggregation does not do a very good job.
This parameter decides if Hive should add an additional map-reduce job. If the grouping set
cardinality (4 in the example above), is more than this value, a new MR job is added under the
assumption that the original group by will reduce the data size.
hive.groupby.limit.extrastep
true
This parameter decides if Hive should
create new MR job for sorting final output
hive.exec.copyfile.maxnumfiles
1
Maximum number of files Hive uses to do sequential HDFS copies between directories.Distributed copies (distcp) will be used instead for larger numbers of files so that copies can be done faster.
hive.exec.copyfile.maxsize
33554432
Maximum file size (in bytes) that Hive uses to do single HDFS copies between directories.Distributed copies (distcp) will be used instead for bigger files so that copies can be done faster.
hive.udtf.auto.progress
false
Whether Hive should automatically send progress information to TaskTracker
when using UDTF's to prevent the task getting killed because of inactivity. Users should be cautious
because this may prevent TaskTracker from killing tasks with infinite loops.
hive.default.fileformat
TextFile
Expects one of [textfile, sequencefile, rcfile, orc, parquet].
Default file format for CREATE TABLE statement. Users can explicitly override it by CREATE TABLE ... STORED AS [FORMAT]
hive.default.fileformat.managed
none
Expects one of [none, textfile, sequencefile, rcfile, orc, parquet].
Default file format for CREATE TABLE statement applied to managed tables only. External tables will be
created with format specified by hive.default.fileformat. Leaving this null will result in using hive.default.fileformat
for all tables.
hive.query.result.fileformat
SequenceFile
Expects one of [textfile, sequencefile, rcfile, llap].
Default file format for storing result of the query.
hive.fileformat.check
true
Whether to check file format or not when loading data files
hive.default.rcfile.serde
org.apache.hadoop.hive.serde2.columnar.LazyBinaryColumnarSerDe
The default SerDe Hive will use for the RCFile format
hive.default.serde
org.apache.hadoop.hive.serde2.lazy.LazySimpleSerDe
The default SerDe Hive will use for storage formats that do not specify a SerDe.
hive.serdes.using.metastore.for.schema
org.apache.hadoop.hive.ql.io.orc.OrcSerde,org.apache.hadoop.hive.serde2.lazy.LazySimpleSerDe,org.apache.hadoop.hive.serde2.columnar.ColumnarSerDe,org.apache.hadoop.hive.serde2.dynamic_type.DynamicSerDe,org.apache.hadoop.hive.serde2.MetadataTypedColumnsetSerDe,org.apache.hadoop.hive.serde2.columnar.LazyBinaryColumnarSerDe,org.apache.hadoop.hive.ql.io.parquet.serde.ParquetHiveSerDe,org.apache.hadoop.hive.serde2.lazybinary.LazyBinarySerDe
SerDes retrieving schema from metastore. This is an internal parameter.
hive.querylog.location
/bak/hive
Location of Hive run time structured log file
hive.querylog.enable.plan.progress
true
Whether to log the plan's progress every time a job's progress is checked.
These logs are written to the location specified by hive.querylog.location
hive.querylog.plan.progress.interval
60000ms
Expects a time value with unit (d/day, h/hour, m/min, s/sec, ms/msec, us/usec, ns/nsec), which is msec if not specified.
The interval to wait between logging the plan's progress.
If there is a whole number percentage change in the progress of the mappers or the reducers,
the progress is logged regardless of this value.
The actual interval will be the ceiling of (this value divided by the value of
hive.exec.counters.pull.interval) multiplied by the value of hive.exec.counters.pull.interval
I.e. if it is not divide evenly by the value of hive.exec.counters.pull.interval it will be
logged less frequently than specified.
This only has an effect if hive.querylog.enable.plan.progress is set to true.
hive.script.serde
org.apache.hadoop.hive.serde2.lazy.LazySimpleSerDe
The default SerDe for transmitting input data to and reading output data from the user scripts.
hive.script.recordreader
org.apache.hadoop.hive.ql.exec.TextRecordReader
The default record reader for reading data from the user scripts.
hive.script.recordwriter
org.apache.hadoop.hive.ql.exec.TextRecordWriter
The default record writer for writing data to the user scripts.
hive.transform.escape.input
false
This adds an option to escape special chars (newlines, carriage returns and
tabs) when they are passed to the user script. This is useful if the Hive tables
can contain data that contains special characters.
hive.binary.record.max.length
1000
Read from a binary stream and treat each hive.binary.record.max.length bytes as a record.
The last record before the end of stream can have less than hive.binary.record.max.length bytes
hive.mapred.local.mem
0
mapper/reducer memory in local mode
hive.mapjoin.smalltable.filesize
25000000
The threshold for the input file size of the small tables; if the file size is smaller
than this threshold, it will try to convert the common join into map join
hive.exec.schema.evolution
true
Use schema evolution to convert self-describing file format's data to the schema desired by the reader.
hive.transactional.events.mem
10000000
Vectorized ACID readers can often load all the delete events from all the delete deltas
into memory to optimize for performance. To prevent out-of-memory errors, this is a rough heuristic
that limits the total number of delete events that can be loaded into memory at once.
Roughly it has been set to 10 million delete events per bucket (~160 MB).
hive.sample.seednumber
0
A number used to percentage sampling. By changing this number, user will change the subsets of data sampled.
hive.test.mode
false
Whether Hive is running in test mode. If yes, it turns on sampling and prefixes the output tablename.
hive.test.mode.prefix
test_
In test mode, specfies prefixes for the output table
hive.test.mode.samplefreq
32
In test mode, specfies sampling frequency for table, which is not bucketed,
For example, the following query:
INSERT OVERWRITE TABLE dest SELECT col1 from src
would be converted to
INSERT OVERWRITE TABLE test_dest
SELECT col1 from src TABLESAMPLE (BUCKET 1 out of 32 on rand(1))
hive.test.mode.nosamplelist
In test mode, specifies comma separated table names which would not apply sampling
hive.test.dummystats.aggregator
internal variable for test
hive.test.dummystats.publisher
internal variable for test
hive.test.currenttimestamp
current timestamp for test
hive.test.rollbacktxn
false
For testing only. Will mark every ACID transaction aborted
hive.test.fail.compaction
false
For testing only. Will cause CompactorMR to fail.
hive.test.fail.heartbeater
false
For testing only. Will cause Heartbeater to fail.
hive.merge.mapfiles
true
Merge small files at the end of a map-only job
hive.merge.mapredfiles
false
Merge small files at the end of a map-reduce job
hive.merge.tezfiles
false
Merge small files at the end of a Tez DAG
hive.merge.sparkfiles
false
Merge small files at the end of a Spark DAG Transformation
hive.merge.size.per.task
256000000
Size of merged files at the end of the job
hive.merge.smallfiles.avgsize
16000000
When the average output file size of a job is less than this number, Hive will start an additional
map-reduce job to merge the output files into bigger files. This is only done for map-only jobs
if hive.merge.mapfiles is true, and for map-reduce jobs if hive.merge.mapredfiles is true.
hive.merge.rcfile.block.level
true
hive.merge.orcfile.stripe.level
true
When hive.merge.mapfiles, hive.merge.mapredfiles or hive.merge.tezfiles is enabled
while writing a table with ORC file format, enabling this config will do stripe-level
fast merge for small ORC files. Note that enabling this config will not honor the
padding tolerance config (hive.exec.orc.block.padding.tolerance).
hive.exec.rcfile.use.explicit.header
true
If this is set the header for RCFiles will simply be RCF. If this is not
set the header will be that borrowed from sequence files, e.g. SEQ- followed
by the input and output RCFile formats.
hive.exec.rcfile.use.sync.cache
true
hive.io.rcfile.record.interval
2147483647
hive.io.rcfile.column.number.conf
0
hive.io.rcfile.tolerate.corruptions
false
hive.io.rcfile.record.buffer.size
4194304
parquet.memory.pool.ratio
0.5
Maximum fraction of heap that can be used by Parquet file writers in one task.
It is for avoiding OutOfMemory error in tasks. Work with Parquet 1.6.0 and above.
This config parameter is defined in Parquet, so that it does not start with 'hive.'.
hive.parquet.timestamp.skip.conversion
true
Current Hive implementation of parquet stores timestamps to UTC, this flag allows skipping of the conversionon reading parquet files from other tools
hive.int.timestamp.conversion.in.seconds
false
Boolean/tinyint/smallint/int/bigint value is interpreted as milliseconds during the timestamp conversion.
Set this flag to true to interpret the value as seconds to be consistent with float/double.
hive.exec.orc.base.delta.ratio
8
The ratio of base writer and
delta writer in terms of STRIPE_SIZE and BUFFER_SIZE.
hive.exec.orc.split.strategy
HYBRID
Expects one of [hybrid, bi, etl].
This is not a user level config. BI strategy is used when the requirement is to spend less time in split generation as opposed to query execution (split generation does not read or cache file footers). ETL strategy is used when spending little more time in split generation is acceptable (split generation reads and caches file footers). HYBRID chooses between the above strategies based on heuristics.
hive.orc.splits.ms.footer.cache.enabled
false
Whether to enable using file metadata cache in metastore for ORC file footers.
hive.orc.splits.ms.footer.cache.ppd.enabled
true
Whether to enable file footer cache PPD (hive.orc.splits.ms.footer.cache.enabled
must also be set to true for this to work).
hive.orc.splits.include.file.footer
false
If turned on splits generated by orc will include metadata about the stripes in the file. This
data is read remotely (from the client or HS2 machine) and sent to all the tasks.
hive.orc.splits.directory.batch.ms
0
How long, in ms, to wait to batch input directories for processing during ORC split
generation. 0 means process directories individually. This can increase the number of
metastore calls if metastore metadata cache is used.
hive.orc.splits.include.fileid
true
Include file ID in splits on file systems that support it.
hive.orc.splits.allow.synthetic.fileid
true
Allow synthetic file ID in splits on file systems that don't have a native one.
hive.orc.cache.stripe.details.mem.size
256Mb
Expects a byte size value with unit (blank for bytes, kb, mb, gb, tb, pb).
Maximum size of orc splits cached in the client.
hive.orc.compute.splits.num.threads
10
How many threads orc should use to create splits in parallel.
hive.orc.cache.use.soft.references
false
By default, the cache that ORC input format uses to store orc file footer use hard
references for the cached object. Setting this to true can help avoid out of memory
issues under memory pressure (in some cases) at the cost of slight unpredictability in
overall query performance.
hive.io.sarg.cache.max.weight.mb
10
The max weight allowed for the SearchArgument Cache. By default, the cache allows a max-weight of 10MB, after which entries will be evicted.
hive.lazysimple.extended_boolean_literal
false
LazySimpleSerde uses this property to determine if it treats 'T', 't', 'F', 'f',
'1', and '0' as extened, legal boolean literal, in addition to 'TRUE' and 'FALSE'.
The default is false, which means only 'TRUE' and 'FALSE' are treated as legal
boolean literal.
hive.optimize.skewjoin
false
Whether to enable skew join optimization.
The algorithm is as follows: At runtime, detect the keys with a large skew. Instead of
processing those keys, store them temporarily in an HDFS directory. In a follow-up map-reduce
job, process those skewed keys. The same key need not be skewed for all the tables, and so,
the follow-up map-reduce job (for the skewed keys) would be much faster, since it would be a
map-join.
hive.optimize.dynamic.partition.hashjoin
false
Whether to enable dynamically partitioned hash join optimization.
This setting is also dependent on enabling hive.auto.convert.join
hive.auto.convert.join
true
Whether Hive enables the optimization about converting common join into mapjoin based on the input file size
hive.auto.convert.join.noconditionaltask
true
Whether Hive enables the optimization about converting common join into mapjoin based on the input file size.
If this parameter is on, and the sum of size for n-1 of the tables/partitions for a n-way join is smaller than the
specified size, the join is directly converted to a mapjoin (there is no conditional task).
hive.auto.convert.join.noconditionaltask.size
10000000
If hive.auto.convert.join.noconditionaltask is off, this parameter does not take affect.
However, if it is on, and the sum of size for n-1 of the tables/partitions for a n-way join is smaller than this size,
the join is directly converted to a mapjoin(there is no conditional task). The default is 10MB
hive.auto.convert.join.use.nonstaged
false
For conditional joins, if input stream from a small alias can be directly applied to join operator without
filtering or projection, the alias need not to be pre-staged in distributed cache via mapred local task.
Currently, this is not working with vectorization or tez execution engine.
hive.skewjoin.key
100000
Determine if we get a skew key in join. If we see more than the specified number of rows with the same key in join operator,
we think the key as a skew join key.
hive.skewjoin.mapjoin.map.tasks
10000
Determine the number of map task used in the follow up map join job for a skew join.
It should be used together with hive.skewjoin.mapjoin.min.split to perform a fine grained control.
hive.skewjoin.mapjoin.min.split
33554432
Determine the number of map task at most used in the follow up map join job for a skew join by specifying
the minimum split size. It should be used together with hive.skewjoin.mapjoin.map.tasks to perform a fine grained control.
hive.heartbeat.interval
1000
Send a heartbeat after this interval - used by mapjoin and filter operators
hive.limit.row.max.size
100000
When trying a smaller subset of data for simple LIMIT, how much size we need to guarantee each row to have at least.
hive.limit.optimize.limit.file
10
When trying a smaller subset of data for simple LIMIT, maximum number of files we can sample.
hive.limit.optimize.enable
false
Whether to enable to optimization to trying a smaller subset of data for simple LIMIT first.
hive.limit.optimize.fetch.max
50000
Maximum number of rows allowed for a smaller subset of data for simple LIMIT, if it is a fetch query.
Insert queries are not restricted by this limit.
hive.limit.pushdown.memory.usage
0.1
Expects value between 0.0f and 1.0f.
The fraction of available memory to be used for buffering rows in Reducesink operator for limit pushdown optimization.
hive.limit.query.max.table.partition
-1
This controls how many partitions can be scanned for each partitioned table.
The default value "-1" means no limit. (DEPRECATED: Please use hive.metastore.limit.partition.request in the metastore instead.)
hive.auto.convert.join.hashtable.max.entries
40000000
If hive.auto.convert.join.noconditionaltask is off, this parameter does not take affect.
However, if it is on, and the predicated number of entries in hashtable for a given join
input is larger than this number, the join will not be converted to a mapjoin.
The value "-1" means no limit.
hive.hashtable.key.count.adjustment
1.0
Adjustment to mapjoin hashtable size derived from table and column statistics; the estimate of the number of keys is divided by this value. If the value is 0, statistics are not usedand hive.hashtable.initialCapacity is used instead.
hive.hashtable.initialCapacity
100000
Initial capacity of mapjoin hashtable if statistics are absent, or if hive.hashtable.key.count.adjustment is set to 0
hive.hashtable.loadfactor
0.75
hive.mapjoin.followby.gby.localtask.max.memory.usage
0.55
This number means how much memory the local task can take to hold the key/value into an in-memory hash table
when this map join is followed by a group by. If the local task's memory usage is more than this number,
the local task will abort by itself. It means the data of the small table is too large to be held in memory.
hive.mapjoin.localtask.max.memory.usage
0.9
This number means how much memory the local task can take to hold the key/value into an in-memory hash table.
If the local task's memory usage is more than this number, the local task will abort by itself.
It means the data of the small table is too large to be held in memory.
hive.mapjoin.check.memory.rows
100000
The number means after how many rows processed it needs to check the memory usage
hive.debug.localtask
false
hive.input.format
org.apache.hadoop.hive.ql.io.CombineHiveInputFormat
The default input format. Set this to HiveInputFormat if you encounter problems with CombineHiveInputFormat.
hive.tez.input.format
org.apache.hadoop.hive.ql.io.HiveInputFormat
The default input format for tez. Tez groups splits in the AM.
hive.tez.container.size
-1
By default Tez will spawn containers of the size of a mapper. This can be used to overwrite.
hive.tez.cpu.vcores
-1
By default Tez will ask for however many cpus map-reduce is configured to use per container.
This can be used to overwrite.
hive.tez.java.opts
By default Tez will use the Java options from map tasks. This can be used to overwrite.
hive.tez.log.level
INFO
The log level to use for tasks executing as part of the DAG.
Used only if hive.tez.java.opts is used to configure Java options.
hive.tez.hs2.user.access
true
Whether to grant access to the hs2/hive user for queries
hive.query.name
This named is used by Tez to set the dag name. This name in turn will appear on
the Tez UI representing the work that was done.
hive.optimize.bucketingsorting
true
Don't create a reducer for enforcing
bucketing/sorting for queries of the form:
insert overwrite table T2 select * from T1;
where T1 and T2 are bucketed/sorted by the same keys into the same number of buckets.
hive.mapred.partitioner
org.apache.hadoop.hive.ql.io.DefaultHivePartitioner
hive.enforce.sortmergebucketmapjoin
false
If the user asked for sort-merge bucketed map-side join, and it cannot be performed, should the query fail or not ?
hive.enforce.bucketmapjoin
false
If the user asked for bucketed map-side join, and it cannot be performed,
should the query fail or not ? For example, if the buckets in the tables being joined are
not a multiple of each other, bucketed map-side join cannot be performed, and the
query will fail if hive.enforce.bucketmapjoin is set to true.
hive.auto.convert.sortmerge.join
false
Will the join be automatically converted to a sort-merge join, if the joined tables pass the criteria for sort-merge join.
hive.auto.convert.sortmerge.join.reduce.side
true
Whether hive.auto.convert.sortmerge.join (if enabled) should be applied to reduce side.
hive.auto.convert.sortmerge.join.bigtable.selection.policy
org.apache.hadoop.hive.ql.optimizer.AvgPartitionSizeBasedBigTableSelectorForAutoSMJ
The policy to choose the big table for automatic conversion to sort-merge join.
By default, the table with the largest partitions is assigned the big table. All policies are:
. based on position of the table - the leftmost table is selected
org.apache.hadoop.hive.ql.optimizer.LeftmostBigTableSMJ.
. based on total size (all the partitions selected in the query) of the table
org.apache.hadoop.hive.ql.optimizer.TableSizeBasedBigTableSelectorForAutoSMJ.
. based on average size (all the partitions selected in the query) of the table
org.apache.hadoop.hive.ql.optimizer.AvgPartitionSizeBasedBigTableSelectorForAutoSMJ.
New policies can be added in future.
hive.auto.convert.sortmerge.join.to.mapjoin
false
If hive.auto.convert.sortmerge.join is set to true, and a join was converted to a sort-merge join,
this parameter decides whether each table should be tried as a big table, and effectively a map-join should be
tried. That would create a conditional task with n+1 children for a n-way join (1 child for each table as the
big table), and the backup task will be the sort-merge join. In some cases, a map-join would be faster than a
sort-merge join, if there is no advantage of having the output bucketed and sorted. For example, if a very big sorted
and bucketed table with few files (say 10 files) are being joined with a very small sorter and bucketed table
with few files (10 files), the sort-merge join will only use 10 mappers, and a simple map-only join might be faster
if the complete small table can fit in memory, and a map-join can be performed.
hive.exec.script.trust
false
hive.exec.rowoffset
false
Whether to provide the row offset virtual column
hive.optimize.index.filter
false
Whether to enable automatic use of indexes
hive.optimize.index.autoupdate
false
Whether to update stale indexes automatically
hive.optimize.ppd
true
Whether to enable predicate pushdown
hive.optimize.ppd.windowing
true
Whether to enable predicate pushdown through windowing
hive.ppd.recognizetransivity
true
Whether to transitively replicate predicate filters over equijoin conditions.
hive.ppd.remove.duplicatefilters
true
During query optimization, filters may be pushed down in the operator tree.
If this config is true only pushed down filters remain in the operator tree,
and the original filter is removed. If this config is false, the original filter
is also left in the operator tree at the original place.
hive.optimize.point.lookup
true
Whether to transform OR clauses in Filter operators into IN clauses
hive.optimize.point.lookup.min
31
Minimum number of OR clauses needed to transform into IN clauses
hive.optimize.partition.columns.separate
true
Extract partition columns from IN clauses
hive.optimize.constant.propagation
true
Whether to enable constant propagation optimizer
hive.optimize.remove.identity.project
true
Removes identity project from operator tree
hive.optimize.metadataonly
false
Whether to eliminate scans of the tables from which no columns are selected. Note
that, when selecting from empty tables with data files, this can produce incorrect
results, so it's disabled by default. It works correctly for normal tables.
hive.optimize.null.scan
true
Dont scan relations which are guaranteed to not generate any rows
hive.optimize.ppd.storage
true
Whether to push predicates down to storage handlers
hive.optimize.groupby
true
Whether to enable the bucketed group by from bucketed partitions/tables.
hive.optimize.bucketmapjoin
false
Whether to try bucket mapjoin
hive.optimize.bucketmapjoin.sortedmerge
false
Whether to try sorted bucket merge map join
hive.optimize.reducededuplication
true
Remove extra map-reduce jobs if the data is already clustered by the same key which needs to be used again.
This should always be set to true. Since it is a new feature, it has been made configurable.
hive.optimize.reducededuplication.min.reducer
4
Reduce deduplication merges two RSs by moving key/parts/reducer-num of the child RS to parent RS.
That means if reducer-num of the child RS is fixed (order by or forced bucketing) and small, it can make very slow, single MR.
The optimization will be automatically disabled if number of reducers would be less than specified value.
hive.optimize.sort.dynamic.partition
false
When enabled dynamic partitioning column will be globally sorted.
This way we can keep only one record writer open for each partition value
in the reducer thereby reducing the memory pressure on reducers.
hive.optimize.sampling.orderby
false
Uses sampling on order-by clause for parallel execution.
hive.optimize.sampling.orderby.number
1000
Total number of samples to be obtained.
hive.optimize.sampling.orderby.percent
0.1
Expects value between 0.0f and 1.0f.
Probability with which a row will be chosen.
hive.optimize.distinct.rewrite
true
When applicable this optimization rewrites distinct aggregates from a single stage to multi-stage aggregation. This may not be optimal in all cases. Ideally, whether to trigger it or not should be cost based decision. Until Hive formalizes cost model for this, this is config driven.
hive.optimize.union.remove
false
Whether to remove the union and push the operators between union and the filesink above union.
This avoids an extra scan of the output by union. This is independently useful for union
queries, and specially useful when hive.optimize.skewjoin.compiletime is set to true, since an
extra union is inserted.
The merge is triggered if either of hive.merge.mapfiles or hive.merge.mapredfiles is set to true.
If the user has set hive.merge.mapfiles to true and hive.merge.mapredfiles to false, the idea was the
number of reducers are few, so the number of files anyway are small. However, with this optimization,
we are increasing the number of files possibly by a big margin. So, we merge aggressively.
hive.optimize.correlation
false
exploit intra-query correlations.
hive.optimize.limittranspose
false
Whether to push a limit through left/right outer join or union. If the value is true and the size of the outer
input is reduced enough (as specified in hive.optimize.limittranspose.reduction), the limit is pushed
to the outer input or union; to remain semantically correct, the limit is kept on top of the join or the union too.
hive.optimize.limittranspose.reductionpercentage
1.0
When hive.optimize.limittranspose is true, this variable specifies the minimal reduction of the
size of the outer input of the join or input of the union that we should get in order to apply the rule.
hive.optimize.limittranspose.reductiontuples
0
When hive.optimize.limittranspose is true, this variable specifies the minimal reduction in the
number of tuples of the outer input of the join or the input of the union that you should get in order to apply the rule.
hive.optimize.filter.stats.reduction
false
Whether to simplify comparison
expressions in filter operators using column stats
hive.optimize.skewjoin.compiletime
false
Whether to create a separate plan for skewed keys for the tables in the join.
This is based on the skewed keys stored in the metadata. At compile time, the plan is broken
into different joins: one for the skewed keys, and the other for the remaining keys. And then,
a union is performed for the 2 joins generated above. So unless the same skewed key is present
in both the joined tables, the join for the skewed key will be performed as a map-side join.
The main difference between this parameter and hive.optimize.skewjoin is that this parameter
uses the skew information stored in the metastore to optimize the plan at compile time itself.
If there is no skew information in the metadata, this parameter will not have any affect.
Both hive.optimize.skewjoin.compiletime and hive.optimize.skewjoin should be set to true.
Ideally, hive.optimize.skewjoin should be renamed as hive.optimize.skewjoin.runtime, but not doing
so for backward compatibility.
If the skew information is correctly stored in the metadata, hive.optimize.skewjoin.compiletime
would change the query plan to take care of it, and hive.optimize.skewjoin will be a no-op.
hive.optimize.cte.materialize.threshold
-1
If the number of references to a CTE clause exceeds this threshold, Hive will materialize it
before executing the main query block. -1 will disable this feature.
hive.optimize.index.filter.compact.minsize
5368709120
Minimum size (in bytes) of the inputs on which a compact index is automatically used.
hive.optimize.index.filter.compact.maxsize
-1
Maximum size (in bytes) of the inputs on which a compact index is automatically used. A negative number is equivalent to infinity.
hive.index.compact.query.max.entries
10000000
The maximum number of index entries to read during a query that uses the compact index. Negative value is equivalent to infinity.
hive.index.compact.query.max.size
10737418240
The maximum number of bytes that a query using the compact index can read. Negative value is equivalent to infinity.
hive.index.compact.binary.search
true
Whether or not to use a binary search to find the entries in an index table that match the filter, where possible
hive.stats.autogather
true
A flag to gather statistics (only basic) automatically during the INSERT OVERWRITE command.
hive.stats.column.autogather
false
A flag to gather column statistics automatically.
hive.stats.dbclass
fs
Expects one of the pattern in [custom, fs].
The storage that stores temporary Hive statistics. In filesystem based statistics collection ('fs'),
each task writes statistics it has collected in a file on the filesystem, which will be aggregated
after the job has finished. Supported values are fs (filesystem) and custom as defined in StatsSetupConst.java.
hive.stats.default.publisher
The Java class (implementing the StatsPublisher interface) that is used by default if hive.stats.dbclass is custom type.
hive.stats.default.aggregator
The Java class (implementing the StatsAggregator interface) that is used by default if hive.stats.dbclass is custom type.
hive.stats.atomic
false
whether to update metastore stats only if all stats are available
hive.client.stats.counters
Subset of counters that should be of interest for hive.client.stats.publishers (when one wants to limit their publishing).
Non-display names should be used
hive.stats.reliable
false
Whether queries will fail because stats cannot be collected completely accurately.
If this is set to true, reading/writing from/into a partition may fail because the stats
could not be computed accurately.
hive.analyze.stmt.collect.partlevel.stats
true
analyze table T compute statistics for columns. Queries like these should compute partitionlevel stats for partitioned table even when no part spec is specified.
hive.stats.gather.num.threads
10
Number of threads used by partialscan/noscan analyze command for partitioned tables.
This is applicable only for file formats that implement StatsProvidingRecordReader (like ORC).
hive.stats.collect.tablekeys
false
Whether join and group by keys on tables are derived and maintained in the QueryPlan.
This is useful to identify how tables are accessed and to determine if they should be bucketed.
hive.stats.collect.scancols
false
Whether column accesses are tracked in the QueryPlan.
This is useful to identify how tables are accessed and to determine if there are wasted columns that can be trimmed.
hive.stats.ndv.error
20.0
Standard error expressed in percentage. Provides a tradeoff between accuracy and compute cost.
A lower value for error indicates higher accuracy and a higher compute cost.
hive.metastore.stats.ndv.tuner
0.0
Provides a tunable parameter between the lower bound and the higher bound of ndv for aggregate ndv across all the partitions.
The lower bound is equal to the maximum of ndv of all the partitions. The higher bound is equal to the sum of ndv of all the partitions.
Its value should be between 0.0 (i.e., choose lower bound) and 1.0 (i.e., choose higher bound)
hive.metastore.stats.ndv.densityfunction
false
Whether to use density function to estimate the NDV for the whole table based on the NDV of partitions
hive.stats.max.variable.length
100
To estimate the size of data flowing through operators in Hive/Tez(for reducer estimation etc.),
average row size is multiplied with the total number of rows coming out of each operator.
Average row size is computed from average column size of all columns in the row. In the absence
of column statistics, for variable length columns (like string, bytes etc.), this value will be
used. For fixed length columns their corresponding Java equivalent sizes are used
(float - 4 bytes, double - 8 bytes etc.).
hive.stats.list.num.entries
10
To estimate the size of data flowing through operators in Hive/Tez(for reducer estimation etc.),
average row size is multiplied with the total number of rows coming out of each operator.
Average row size is computed from average column size of all columns in the row. In the absence
of column statistics and for variable length complex columns like list, the average number of
entries/values can be specified using this config.
hive.stats.map.num.entries
10
To estimate the size of data flowing through operators in Hive/Tez(for reducer estimation etc.),
average row size is multiplied with the total number of rows coming out of each operator.
Average row size is computed from average column size of all columns in the row. In the absence
of column statistics and for variable length complex columns like map, the average number of
entries/values can be specified using this config.
hive.stats.fetch.partition.stats
true
Annotation of operator tree with statistics information requires partition level basic
statistics like number of rows, data size and file size. Partition statistics are fetched from
metastore. Fetching partition statistics for each needed partition can be expensive when the
number of partitions is high. This flag can be used to disable fetching of partition statistics
from metastore. When this flag is disabled, Hive will make calls to filesystem to get file sizes
and will estimate the number of rows from row schema.
hive.stats.fetch.column.stats
false
Annotation of operator tree with statistics information requires column statistics.
Column statistics are fetched from metastore. Fetching column statistics for each needed column
can be expensive when the number of columns is high. This flag can be used to disable fetching
of column statistics from metastore.
hive.stats.join.factor
1.1
Hive/Tez optimizer estimates the data size flowing through each of the operators. JOIN operator
uses column statistics to estimate the number of rows flowing out of it and hence the data size.
In the absence of column statistics, this factor determines the amount of rows that flows out
of JOIN operator.
hive.stats.deserialization.factor
1.0
Hive/Tez optimizer estimates the data size flowing through each of the operators. In the absence
of basic statistics like number of rows and data size, file size is used to estimate the number
of rows and data size. Since files in tables/partitions are serialized (and optionally
compressed) the estimates of number of rows and data size cannot be reliably determined.
This factor is multiplied with the file size to account for serialization and compression.
hive.stats.filter.in.factor
1.0
Currently column distribution is assumed to be uniform. This can lead to overestimation/underestimation
in the number of rows filtered by a certain operator, which in turn might lead to overprovision or
underprovision of resources. This factor is applied to the cardinality estimation of IN clauses in
filter operators.
hive.support.concurrency
true
Whether Hive supports concurrency control or not.
A ZooKeeper instance must be up and running when using zookeeper Hive lock manager
hive.lock.manager
org.apache.hadoop.hive.ql.lockmgr.zookeeper.ZooKeeperHiveLockManager
hive.lock.numretries
100
The number of times you want to try to get all the locks
hive.unlock.numretries
10
The number of times you want to retry to do one unlock
hive.lock.sleep.between.retries
60s
Expects a time value with unit (d/day, h/hour, m/min, s/sec, ms/msec, us/usec, ns/nsec), which is sec if not specified.
The time should be in between 0 sec (exclusive) and 9223372036854775807 sec (exclusive).
The maximum sleep time between various retries
hive.lock.mapred.only.operation
false
This param is to control whether or not only do lock on queries
that need to execute at least one mapred job.
hive.zookeeper.quorum
List of ZooKeeper servers to talk to. This is needed for:
1. Read/write locks - when hive.lock.manager is set to
org.apache.hadoop.hive.ql.lockmgr.zookeeper.ZooKeeperHiveLockManager,
2. When HiveServer2 supports service discovery via Zookeeper.
3. For delegation token storage if zookeeper store is used, if
hive.cluster.delegation.token.store.zookeeper.connectString is not set
4. LLAP daemon registry service
hive.zookeeper.client.port
2181
The port of ZooKeeper servers to talk to.
If the list of Zookeeper servers specified in hive.zookeeper.quorum
does not contain port numbers, this value is used.
hive.zookeeper.session.timeout
1200000ms
Expects a time value with unit (d/day, h/hour, m/min, s/sec, ms/msec, us/usec, ns/nsec), which is msec if not specified.
ZooKeeper client's session timeout (in milliseconds). The client is disconnected, and as a result, all locks released,
if a heartbeat is not sent in the timeout.
hive.zookeeper.namespace
hive_zookeeper_namespace
The parent node under which all ZooKeeper nodes are created.
hive.zookeeper.clean.extra.nodes
false
Clean extra nodes at the end of the session.
hive.zookeeper.connection.max.retries
3
Max number of times to retry when connecting to the ZooKeeper server.
hive.zookeeper.connection.basesleeptime
1000ms
Expects a time value with unit (d/day, h/hour, m/min, s/sec, ms/msec, us/usec, ns/nsec), which is msec if not specified.
Initial amount of time (in milliseconds) to wait between retries
when connecting to the ZooKeeper server when using ExponentialBackoffRetry policy.
hive.txn.manager
org.apache.hadoop.hive.ql.lockmgr.DbTxnManager
Set to org.apache.hadoop.hive.ql.lockmgr.DbTxnManager as part of turning on Hive
transactions, which also requires appropriate settings for hive.compactor.initiator.on,
hive.compactor.worker.threads, hive.support.concurrency (true),
and hive.exec.dynamic.partition.mode (nonstrict).
The default DummyTxnManager replicates pre-Hive-0.13 behavior and provides
no transactions.
hive.txn.strict.locking.mode
true
In strict mode non-ACID
resources use standard R/W lock semantics, e.g. INSERT will acquire exclusive lock.
In nonstrict mode, for non-ACID resources, INSERT will only acquire shared lock, which
allows two concurrent writes to the same partition but still lets lock manager prevent
DROP TABLE etc. when the table is being written to
hive.txn.timeout
300s
Expects a time value with unit (d/day, h/hour, m/min, s/sec, ms/msec, us/usec, ns/nsec), which is sec if not specified.
time after which transactions are declared aborted if the client has not sent a heartbeat.
hive.txn.heartbeat.threadpool.size
5
The number of threads to use for heartbeating. For Hive CLI, 1 is enough. For HiveServer2, we need a few
hive.txn.manager.dump.lock.state.on.acquire.timeout
false
Set this to true so that when attempt to acquire a lock on resource times out, the current state of the lock manager is dumped to log file. This is for debugging. See also hive.lock.numretries and hive.lock.sleep.between.retries.
hive.txn.operational.properties
0
Sets the operational properties that control the appropriate behavior for various
versions of the Hive ACID subsystem. Setting it to zero will turn on the legacy mode
for ACID, while setting it to one will enable a split-update feature found in the newer
version of Hive ACID subsystem. Mostly it is intended to be used as an internal property
for future versions of ACID. (See HIVE-14035 for details.)
hive.max.open.txns
100000
Maximum number of open transactions. If
current open transactions reach this limit, future open transaction requests will be
rejected, until this number goes below the limit.
hive.count.open.txns.interval
1s
Expects a time value with unit (d/day, h/hour, m/min, s/sec, ms/msec, us/usec, ns/nsec), which is sec if not specified.
Time in seconds between checks to count open transactions.
hive.txn.max.open.batch
1000
Maximum number of transactions that can be fetched in one call to open_txns().
This controls how many transactions streaming agents such as Flume or Storm open
simultaneously. The streaming agent then writes that number of entries into a single
file (per Flume agent or Storm bolt). Thus increasing this value decreases the number
of delta files created by streaming agents. But it also increases the number of open
transactions that Hive has to track at any given time, which may negatively affect
read performance.
hive.txn.retryable.sqlex.regex
Comma separated list
of regular expression patterns for SQL state, error code, and error message of
retryable SQLExceptions, that's suitable for the metastore DB.
For example: Can't serialize.*,40001$,^Deadlock,.*ORA-08176.*
The string that the regex will be matched against is of the following form, where ex is a SQLException:
ex.getMessage() + " (SQLState=" + ex.getSQLState() + ", ErrorCode=" + ex.getErrorCode() + ")"
hive.compactor.initiator.on
true
Whether to run the initiator and cleaner threads on this metastore instance or not.
Set this to true on one instance of the Thrift metastore service as part of turning
on Hive transactions. For a complete list of parameters required for turning on
transactions, see hive.txn.manager.
hive.compactor.worker.threads
10
How many compactor worker threads to run on this metastore instance. Set this to a
positive number on one or more instances of the Thrift metastore service as part of
turning on Hive transactions. For a complete list of parameters required for turning
on transactions, see hive.txn.manager.
Worker threads spawn MapReduce jobs to do compactions. They do not do the compactions
themselves. Increasing the number of worker threads will decrease the time it takes
tables or partitions to be compacted once they are determined to need compaction.
It will also increase the background load on the Hadoop cluster as more MapReduce jobs
will be running in the background.
hive.compactor.worker.timeout
86400s
Expects a time value with unit (d/day, h/hour, m/min, s/sec, ms/msec, us/usec, ns/nsec), which is sec if not specified.
Time in seconds after which a compaction job will be declared failed and the
compaction re-queued.
hive.compactor.check.interval
100s
Expects a time value with unit (d/day, h/hour, m/min, s/sec, ms/msec, us/usec, ns/nsec), which is sec if not specified.
Time in seconds between checks to see if any tables or partitions need to be
compacted. This should be kept high because each check for compaction requires
many calls against the NameNode.
Decreasing this value will reduce the time it takes for compaction to be started
for a table or partition that requires compaction. However, checking if compaction
is needed requires several calls to the NameNode for each table or partition that
has had a transaction done on it since the last major compaction. So decreasing this
value will increase the load on the NameNode.
hive.compactor.delta.num.threshold
5
Number of delta directories in a table or partition that will trigger a minor
compaction.
hive.compactor.delta.pct.threshold
0.001
Percentage (fractional) size of the delta files relative to the base that will trigger
a major compaction. (1.0 = 100%, so the default 0.1 = 10%.)
hive.compactor.max.num.delta
500
Maximum number of delta files that the compactor will attempt to handle in a single job.
hive.compactor.abortedtxn.threshold
100
Number of aborted transactions involving a given table or partition that will trigger
a major compaction.
hive.compactor.initiator.failed.compacts.threshold
2
Expects value between 1 and 20.
Number of consecutive compaction failures (per table/partition) after which automatic compactions will not be scheduled any more. Note that this must be less than hive.compactor.history.retention.failed.
hive.compactor.cleaner.run.interval
5000ms
Expects a time value with unit (d/day, h/hour, m/min, s/sec, ms/msec, us/usec, ns/nsec), which is msec if not specified.
Time between runs of the cleaner thread
hive.compactor.job.queue
Used to specify name of Hadoop queue to which
Compaction jobs will be submitted. Set to empty string to let Hadoop choose the queue.
hive.compactor.history.retention.succeeded
3
Expects value between 0 and 100.
Determines how many successful compaction records will be retained in compaction history for a given table/partition.
hive.compactor.history.retention.failed
3
Expects value between 0 and 100.
Determines how many failed compaction records will be retained in compaction history for a given table/partition.
hive.compactor.history.retention.attempted
2
Expects value between 0 and 100.
Determines how many attempted compaction records will be retained in compaction history for a given table/partition.
hive.compactor.history.reaper.interval
2m
Expects a time value with unit (d/day, h/hour, m/min, s/sec, ms/msec, us/usec, ns/nsec), which is msec if not specified.
Determines how often compaction history reaper runs
hive.timedout.txn.reaper.start
100s
Expects a time value with unit (d/day, h/hour, m/min, s/sec, ms/msec, us/usec, ns/nsec), which is msec if not specified.
Time delay of 1st reaper run after metastore start
hive.timedout.txn.reaper.interval
180s
Expects a time value with unit (d/day, h/hour, m/min, s/sec, ms/msec, us/usec, ns/nsec), which is msec if not specified.
Time interval describing how often the reaper runs
hive.writeset.reaper.interval
60s
Expects a time value with unit (d/day, h/hour, m/min, s/sec, ms/msec, us/usec, ns/nsec), which is msec if not specified.
Frequency of WriteSet reaper runs
hive.merge.cardinality.check
true
Set to true to ensure that each SQL Merge statement ensures that for each row in the target
table there is at most 1 matching row in the source table per SQL Specification.
hive.druid.indexer.segments.granularity
DAY
Expects one of the pattern in [YEAR, MONTH, WEEK, DAY, HOUR, MINUTE, SECOND].
Granularity for the segments created by the Druid storage handler
hive.druid.indexer.partition.size.max
5000000
Maximum number of records per segment partition
hive.druid.indexer.memory.rownum.max
75000
Maximum number of records in memory while storing data in Druid
hive.druid.broker.address.default
localhost:8082
Address of the Druid broker. If we are querying Druid from Hive, this address needs to be
declared
hive.druid.coordinator.address.default
localhost:8081
Address of the Druid coordinator. It is used to check the load status of newly created segments
hive.druid.select.distribute
true
If it is set to true, we distribute the execution of Druid Select queries. Concretely, we retrieve
the result for Select queries directly from the Druid nodes containing the segments data.
In particular, first we contact the Druid broker node to obtain the nodes containing the segments
for the given query, and then we contact those nodes to retrieve the results for the query.
If it is set to false, we do not execute the Select queries in a distributed fashion. Instead, results
for those queries are returned by the Druid broker node.
hive.druid.select.threshold
10000
Takes only effect when hive.druid.select.distribute is set to false.
When we can split a Select query, this is the maximum number of rows that we try to retrieve
per query. In order to do that, we obtain the estimated size for the complete result. If the
number of records of the query results is larger than this threshold, we split the query in
total number of rows/threshold parts across the time dimension. Note that we assume the
records to be split uniformly across the time dimension.
hive.druid.http.numConnection
20
Number of connections used by
the HTTP client.
hive.druid.http.read.timeout
PT1M
Read timeout period for the HTTP
client in ISO8601 format (for example P2W, P3M, PT1H30M, PT0.750S), default is period of 1 minute.
hive.druid.sleep.time
PT10S
Sleep time between retries in ISO8601 format (for example P2W, P3M, PT1H30M, PT0.750S), default is period of 10 seconds.
hive.druid.basePersistDirectory
Local temporary directory used to persist intermediate indexing state, will default to JVM system property java.io.tmpdir.
hive.druid.storage.storageDirectory
/druid/segments
druid deep storage location.
hive.druid.metadata.base
druid
Default prefix for metadata tables
hive.druid.metadata.db.type
mysql
Expects one of the pattern in [mysql, postgresql].
Type of the metadata database.
hive.druid.metadata.username
Username to connect to Type of the metadata DB.
hive.druid.metadata.password
Password to connect to Type of the metadata DB.
hive.druid.metadata.uri
URI to connect to the database (for example jdbc:mysql://hostname:port/DBName).
hive.druid.working.directory
/tmp/workingDirectory
Default hdfs working directory used to store some intermediate metadata
hive.druid.maxTries
5
Maximum number of retries before giving up
hive.druid.passiveWaitTimeMs
30000
Wait time in ms default to 30 seconds.
hive.hbase.wal.enabled
true
Whether writes to HBase should be forced to the write-ahead log.
Disabling this improves HBase write performance at the risk of lost writes in case of a crash.
hive.hbase.generatehfiles
false
True when HBaseStorageHandler should generate hfiles instead of operate against the online table.
hive.hbase.snapshot.name
The HBase table snapshot name to use.
hive.hbase.snapshot.restoredir
/tmp
The directory in which to restore the HBase table snapshot.
hive.archive.enabled
false
Whether archiving operations are permitted
hive.optimize.index.groupby
false
Whether to enable optimization of group-by queries using Aggregate indexes.
hive.fetch.task.conversion
more
Expects one of [none, minimal, more].
Some select queries can be converted to single FETCH task minimizing latency.
Currently the query should be single sourced not having any subquery and should not have
any aggregations or distincts (which incurs RS), lateral views and joins.
0. none : disable hive.fetch.task.conversion
1. minimal : SELECT STAR, FILTER on partition columns, LIMIT only
2. more : SELECT, FILTER, LIMIT only (support TABLESAMPLE and virtual columns)
hive.fetch.task.conversion.threshold
1073741824
Input threshold for applying hive.fetch.task.conversion. If target table is native, input length
is calculated by summation of file lengths. If it's not native, storage handler for the table
can optionally implement org.apache.hadoop.hive.ql.metadata.InputEstimator interface.
hive.fetch.task.aggr
false
Aggregation queries with no group-by clause (for example, select count(*) from src) execute
final aggregations in single reduce task. If this is set true, Hive delegates final aggregation
stage to fetch task, possibly decreasing the query time.
hive.compute.query.using.stats
true
When set to true Hive will answer a few queries like count(1) purely using stats
stored in metastore. For basic stats collection turn on the config hive.stats.autogather to true.
For more advanced stats collection need to run analyze table queries.
hive.fetch.output.serde
org.apache.hadoop.hive.serde2.DelimitedJSONSerDe
The SerDe used by FetchTask to serialize the fetch output.
hive.cache.expr.evaluation
true
If true, the evaluation result of a deterministic expression referenced twice or more
will be cached.
For example, in a filter condition like '.. where key + 10 = 100 or key + 10 = 0'
the expression 'key + 10' will be evaluated/cached once and reused for the following
expression ('key + 10 = 0'). Currently, this is applied only to expressions in select
or filter operators.
hive.variable.substitute
true
This enables substitution using syntax like ${var} ${system:var} and ${env:var}.
hive.variable.substitute.depth
40
The maximum replacements the substitution engine will do.
hive.conf.validation
true
Enables type checking for registered Hive configurations
hive.semantic.analyzer.hook
hive.security.authorization.enabled
false
enable or disable the Hive client authorization
hive.security.authorization.manager
org.apache.hadoop.hive.ql.security.authorization.plugin.sqlstd.SQLStdHiveAuthorizerFactory
The Hive client authorization manager class name. The user defined authorization class should implement
interface org.apache.hadoop.hive.ql.security.authorization.HiveAuthorizationProvider.
hive.security.authenticator.manager
org.apache.hadoop.hive.ql.security.HadoopDefaultAuthenticator
hive client authenticator manager class name. The user defined authenticator should implement
interface org.apache.hadoop.hive.ql.security.HiveAuthenticationProvider.
hive.security.metastore.authorization.manager
org.apache.hadoop.hive.ql.security.authorization.DefaultHiveMetastoreAuthorizationProvider
Names of authorization manager classes (comma separated) to be used in the metastore
for authorization. The user defined authorization class should implement interface
org.apache.hadoop.hive.ql.security.authorization.HiveMetastoreAuthorizationProvider.
All authorization manager classes have to successfully authorize the metastore API
call for the command execution to be allowed.
hive.security.metastore.authorization.auth.reads
true
If this is true, metastore authorizer authorizes read actions on database, table
hive.security.metastore.authenticator.manager
org.apache.hadoop.hive.ql.security.HadoopDefaultMetastoreAuthenticator
authenticator manager class name to be used in the metastore for authentication.
The user defined authenticator should implement interface org.apache.hadoop.hive.ql.security.HiveAuthenticationProvider.
hive.security.authorization.createtable.user.grants
the privileges automatically granted to some users whenever a table gets created.
An example like "userX,userY:select;userZ:create" will grant select privilege to userX and userY,
and grant create privilege to userZ whenever a new table created.
hive.security.authorization.createtable.group.grants
the privileges automatically granted to some groups whenever a table gets created.
An example like "groupX,groupY:select;groupZ:create" will grant select privilege to groupX and groupY,
and grant create privilege to groupZ whenever a new table created.
hive.security.authorization.createtable.role.grants
the privileges automatically granted to some roles whenever a table gets created.
An example like "roleX,roleY:select;roleZ:create" will grant select privilege to roleX and roleY,
and grant create privilege to roleZ whenever a new table created.
hive.security.authorization.createtable.owner.grants
The privileges automatically granted to the owner whenever a table gets created.
An example like "select,drop" will grant select and drop privilege to the owner
of the table. Note that the default gives the creator of a table no access to the
table (but see HIVE-8067).
hive.security.authorization.task.factory
org.apache.hadoop.hive.ql.parse.authorization.HiveAuthorizationTaskFactoryImpl
Authorization DDL task factory implementation
hive.security.authorization.sqlstd.confwhitelist
List of comma separated Java regexes. Configurations parameters that match these
regexes can be modified by user when SQL standard authorization is enabled.
To get the default value, use the 'set <param>' command.
Note that the hive.conf.restricted.list checks are still enforced after the white list
check
hive.security.authorization.sqlstd.confwhitelist.append
List of comma separated Java regexes, to be appended to list set in
hive.security.authorization.sqlstd.confwhitelist. Using this list instead
of updating the original list means that you can append to the defaults
set by SQL standard authorization instead of replacing it entirely.
hive.cli.print.header
false
Whether to print the names of the columns in query output.
hive.cli.tez.session.async
true
Whether to start Tez
session in background when running CLI with Tez, allowing CLI to be available earlier.
hive.error.on.empty.partition
false
Whether to throw an exception if dynamic partition insert generates empty results.
hive.index.compact.file
internal variable
hive.index.blockfilter.file
internal variable
hive.index.compact.file.ignore.hdfs
false
When true the HDFS location stored in the index file will be ignored at runtime.
If the data got moved or the name of the cluster got changed, the index data should still be usable.
hive.exim.uri.scheme.whitelist
hdfs,pfile,file,s3,s3a
A comma separated list of acceptable URI schemes for import and export.
hive.exim.strict.repl.tables
true
Parameter that determines if 'regular' (non-replication) export dumps can be
imported on to tables that are the target of replication. If this parameter is
set, regular imports will check if the destination table(if it exists) has a 'repl.last.id' set on it. If so, it will fail.
hive.repl.task.factory
org.apache.hive.hcatalog.api.repl.exim.EximReplicationTaskFactory
Parameter that can be used to override which ReplicationTaskFactory will be
used to instantiate ReplicationTask events. Override for third party repl plugins
hive.mapper.cannot.span.multiple.partitions
false
hive.rework.mapredwork
false
should rework the mapred work or not.
This is first introduced by SymlinkTextInputFormat to replace symlink files with real paths at compile time.
hive.exec.concatenate.check.index
true
If this is set to true, Hive will throw error when doing
'alter table tbl_name [partSpec] concatenate' on a table/partition
that has indexes on it. The reason the user want to set this to true
is because it can help user to avoid handling all index drop, recreation,
rebuild work. This is very helpful for tables with thousands of partitions.
hive.io.exception.handlers
A list of io exception handler class names. This is used
to construct a list exception handlers to handle exceptions thrown
by record readers
hive.log4j.file
Hive log4j configuration file.
If the property is not set, then logging will be initialized using hive-log4j2.properties found on the classpath.
If the property is set, the value must be a valid URI (java.net.URI, e.g. "file:///tmp/my-logging.xml"),
which you can then extract a URL from and pass to PropertyConfigurator.configure(URL).
hive.exec.log4j.file
Hive log4j configuration file for execution mode(sub command).
If the property is not set, then logging will be initialized using hive-exec-log4j2.properties found on the classpath.
If the property is set, the value must be a valid URI (java.net.URI, e.g. "file:///tmp/my-logging.xml"),
which you can then extract a URL from and pass to PropertyConfigurator.configure(URL).
hive.async.log.enabled
true
Whether to enable Log4j2's asynchronous logging. Asynchronous logging can give
significant performance improvement as logging will be handled in separate thread
that uses LMAX disruptor queue for buffering log messages.
Refer https://logging.apache.org/log4j/2.x/manual/async.html for benefits and
drawbacks.
hive.log.explain.output
false
Whether to log explain output for every query.
When enabled, will log EXPLAIN EXTENDED output for the query at INFO log4j log level.
hive.explain.user
true
Whether to show explain result at user level.
When enabled, will log EXPLAIN output for the query at user level.
hive.autogen.columnalias.prefix.label
_c
String used as a prefix when auto generating column alias.
By default the prefix label will be appended with a column position number to form the column alias.
Auto generation would happen if an aggregate function is used in a select clause without an explicit alias.
hive.autogen.columnalias.prefix.includefuncname
false
Whether to include function name in the column alias auto generated by Hive.
hive.service.metrics.class
org.apache.hadoop.hive.common.metrics.metrics2.CodahaleMetrics
Expects one of [org.apache.hadoop.hive.common.metrics.metrics2.codahalemetrics, org.apache.hadoop.hive.common.metrics.legacymetrics].
Hive metrics subsystem implementation class.
hive.service.metrics.reporter
JSON_FILE, JMX
Reporter type for metric class org.apache.hadoop.hive.common.metrics.metrics2.CodahaleMetrics, comma separated list of JMX, CONSOLE, JSON_FILE, HADOOP2
hive.service.metrics.file.location
/tmp/report.json
For metric class org.apache.hadoop.hive.common.metrics.metrics2.CodahaleMetrics JSON_FILE reporter, the location of local JSON metrics file. This file will get overwritten at every interval.
hive.service.metrics.file.frequency
5s
Expects a time value with unit (d/day, h/hour, m/min, s/sec, ms/msec, us/usec, ns/nsec), which is msec if not specified.
For metric class org.apache.hadoop.hive.common.metrics.metrics2.CodahaleMetrics JSON_FILE reporter, the frequency of updating JSON metrics file.
hive.service.metrics.hadoop2.frequency
30s
Expects a time value with unit (d/day, h/hour, m/min, s/sec, ms/msec, us/usec, ns/nsec), which is sec if not specified.
For metric class org.apache.hadoop.hive.common.metrics.metrics2.CodahaleMetrics HADOOP2 reporter, the frequency of updating the HADOOP2 metrics system.
hive.service.metrics.hadoop2.component
hive
Component name to provide to Hadoop2 Metrics system. Ideally 'hivemetastore' for the MetaStore and and 'hiveserver2' for HiveServer2.
hive.exec.perf.logger
org.apache.hadoop.hive.ql.log.PerfLogger
The class responsible for logging client side performance metrics.
Must be a subclass of org.apache.hadoop.hive.ql.log.PerfLogger
hive.start.cleanup.scratchdir
false
To cleanup the Hive scratchdir when starting the Hive Server
hive.scratchdir.lock
false
To hold a lock file in scratchdir to prevent to be removed by cleardanglingscratchdir
hive.insert.into.multilevel.dirs
false
Where to insert into multilevel directories like
"insert directory '/HIVEFT25686/chinna/' from table"
hive.warehouse.subdir.inherit.perms
true
Set this to false if the table directories should be created
with the permissions derived from dfs umask instead of
inheriting the permission of the warehouse or database directory.
hive.insert.into.external.tables
true
whether insert into external tables is allowed
hive.exec.temporary.table.storage
default
Expects one of [memory, ssd, default].
Define the storage policy for temporary tables.Choices between memory, ssd and default
hive.query.lifetime.hooks
A comma separated list of hooks which implement QueryLifeTimeHook. These will be triggered before/after query compilation and before/after query execution, in the order specified
hive.exec.driver.run.hooks
A comma separated list of hooks which implement HiveDriverRunHook. Will be run at the beginning and end of Driver.run, these will be run in the order specified.
hive.ddl.output.format
The data format to use for DDL output. One of "text" (for human
readable text) or "json" (for a json object).
hive.entity.separator
@
Separator used to construct names of tables and partitions. For example, dbname@tablename@partitionname
hive.entity.capture.transform
false
Compiler to capture transform URI referred in the query
hive.display.partition.cols.separately
true
In older Hive version (0.10 and earlier) no distinction was made between
partition columns or non-partition columns while displaying columns in describe
table. From 0.12 onwards, they are displayed separately. This flag will let you
get old behavior, if desired. See, test-case in patch for HIVE-6689.
hive.ssl.protocol.blacklist
SSLv2,SSLv3
SSL Versions to disable for all Hive Servers
hive.server2.clear.dangling.scratchdir
false
Clear dangling scratch dir periodically in HS2
hive.server2.clear.dangling.scratchdir.interval
1800s
Expects a time value with unit (d/day, h/hour, m/min, s/sec, ms/msec, us/usec, ns/nsec), which is sec if not specified.
Interval to clear dangling scratch dir periodically in HS2
hive.server2.sleep.interval.between.start.attempts
60s
Expects a time value with unit (d/day, h/hour, m/min, s/sec, ms/msec, us/usec, ns/nsec), which is msec if not specified.
The time should be in between 0 msec (inclusive) and 9223372036854775807 msec (inclusive).
Amount of time to sleep between HiveServer2 start attempts. Primarily meant for tests
hive.server2.max.start.attempts
30
Expects value bigger than 0.
Number of times HiveServer2 will attempt to start before exiting. The sleep interval between retries is determined by hive.server2.sleep.interval.between.start.attempts
The default of 30 will keep trying for 30 minutes.
hive.server2.support.dynamic.service.discovery
false
Whether HiveServer2 supports dynamic service discovery for its clients. To support this, each instance of HiveServer2 currently uses ZooKeeper to register itself, when it is brought up. JDBC/ODBC clients should use the ZooKeeper ensemble: hive.zookeeper.quorum in their connection string.
hive.server2.zookeeper.namespace
hiveserver2
The parent node in ZooKeeper used by HiveServer2 when supporting dynamic service discovery.
hive.server2.zookeeper.publish.configs
true
Whether we should publish HiveServer2's configs to ZooKeeper.
hive.server2.global.init.file.location
${env:HIVE_CONF_DIR}
Either the location of a HS2 global init file or a directory containing a .hiverc file. If the
property is set, the value must be a valid path to an init file or directory where the init file is located.
hive.server2.transport.mode
binary
Expects one of [binary, http].
Transport mode of HiveServer2.
hive.server2.thrift.bind.host
Bind host on which to run the HiveServer2 Thrift service.
hive.driver.parallel.compilation
false
Whether to
enable parallel compilation of the queries between sessions and within the same session on HiveServer2. The default is false.
hive.server2.compile.lock.timeout
0s
Expects a time value with unit (d/day, h/hour, m/min, s/sec, ms/msec, us/usec, ns/nsec), which is sec if not specified.
Number of seconds a request will wait to acquire the compile lock before giving up. Setting it to 0s disables the timeout.
hive.server2.parallel.ops.in.session
true
Whether to allow several parallel operations (such as SQL statements) in one session.
hive.server2.webui.host
0.0.0.0
The host address the HiveServer2 WebUI will listen on
hive.server2.webui.port
10002
The port the HiveServer2 WebUI will listen on. This can beset to 0 or a negative integer to disable the web UI
hive.server2.webui.max.threads
50
The max HiveServer2 WebUI threads
hive.server2.webui.use.ssl
false
Set this to true for using SSL encryption for HiveServer2 WebUI.
hive.server2.webui.keystore.path
SSL certificate keystore location for HiveServer2 WebUI.
hive.server2.webui.keystore.password
SSL certificate keystore password for HiveServer2 WebUI.
hive.server2.webui.use.spnego
false
If true, the HiveServer2 WebUI will be secured with SPNEGO. Clients must authenticate with Kerberos.
hive.server2.webui.spnego.keytab
The path to the Kerberos Keytab file containing the HiveServer2 WebUI SPNEGO service principal.
hive.server2.webui.spnego.principal
HTTP/[email protected]
The HiveServer2 WebUI SPNEGO service principal.
The special string _HOST will be replaced automatically with
the value of hive.server2.webui.host or the correct host name.
hive.server2.webui.max.historic.queries
25
The maximum number of past queries to show in HiverSever2 WebUI.
hive.server2.tez.default.queues
A list of comma separated values corresponding to YARN queues of the same name.
When HiveServer2 is launched in Tez mode, this configuration needs to be set
for multiple Tez sessions to run in parallel on the cluster.
hive.server2.tez.sessions.per.default.queue
1
A positive integer that determines the number of Tez sessions that should be
launched on each of the queues specified by "hive.server2.tez.default.queues".
Determines the parallelism on each queue.
hive.server2.tez.initialize.default.sessions
false
This flag is used in HiveServer2 to enable a user to use HiveServer2 without
turning on Tez for HiveServer2. The user could potentially want to run queries
over Tez without the pool of sessions.
hive.server2.tez.session.lifetime
162h
Expects a time value with unit (d/day, h/hour, m/min, s/sec, ms/msec, us/usec, ns/nsec), which is hour if not specified.
The lifetime of the Tez sessions launched by HS2 when default sessions are enabled.
Set to 0 to disable session expiration.
hive.server2.tez.session.lifetime.jitter
3h
Expects a time value with unit (d/day, h/hour, m/min, s/sec, ms/msec, us/usec, ns/nsec), which is hour if not specified.
The jitter for Tez session lifetime; prevents all the sessions from restarting at once.
hive.server2.tez.sessions.init.threads
16
If hive.server2.tez.initialize.default.sessions is enabled, the maximum number of
threads to use to initialize the default sessions.
hive.server2.tez.sessions.restricted.configs
The configuration settings that cannot be set when submitting jobs to HiveServer2. If
any of these are set to values different from those in the server configuration, an
exception will be thrown.
hive.server2.tez.sessions.custom.queue.allowed
true
Expects one of [true, false, ignore].
Whether Tez session pool should allow submitting queries to custom queues. The options
are true, false (error out), ignore (accept the query but ignore the queue setting).
hive.server2.logging.operation.enabled
true
When true, HS2 will save operation logs and make them available for clients
hive.server2.logging.operation.log.location
/bak/hive/operation_logs
Top level directory where operation logs are stored if logging functionality is enabled
hive.server2.logging.operation.level
EXECUTION
Expects one of [none, execution, performance, verbose].
HS2 operation logging mode available to clients to be set at session level.
For this to work, hive.server2.logging.operation.enabled should be set to true.
NONE: Ignore any logging
EXECUTION: Log completion of tasks
PERFORMANCE: Execution + Performance logs
VERBOSE: All logs
hive.server2.metrics.enabled
false
Enable metrics on the HiveServer2.
hive.server2.thrift.http.port
10001
Port number of HiveServer2 Thrift interface when hive.server2.transport.mode is 'http'.
hive.server2.thrift.http.path
cliservice
Path component of URL endpoint when in HTTP mode.
hive.server2.thrift.max.message.size
104857600
Maximum message size in bytes a HS2 server will accept.
hive.server2.thrift.http.max.idle.time
1800s
Expects a time value with unit (d/day, h/hour, m/min, s/sec, ms/msec, us/usec, ns/nsec), which is msec if not specified.
Maximum idle time for a connection on the server when in HTTP mode.
hive.server2.thrift.http.worker.keepalive.time
60s
Expects a time value with unit (d/day, h/hour, m/min, s/sec, ms/msec, us/usec, ns/nsec), which is sec if not specified.
Keepalive time for an idle http worker thread. When the number of workers exceeds min workers, excessive threads are killed after this time interval.
hive.server2.thrift.http.request.header.size
6144
Request header size in bytes, when using HTTP transport mode. Jetty defaults used.
hive.server2.thrift.http.response.header.size
6144
Response header size in bytes, when using HTTP transport mode. Jetty defaults used.
hive.server2.thrift.http.cookie.auth.enabled
true
When true, HiveServer2 in HTTP transport mode, will use cookie based authentication mechanism.
hive.server2.thrift.http.cookie.max.age
86400s
Expects a time value with unit (d/day, h/hour, m/min, s/sec, ms/msec, us/usec, ns/nsec), which is sec if not specified.
Maximum age in seconds for server side cookie used by HS2 in HTTP mode.
hive.server2.thrift.http.cookie.domain
Domain for the HS2 generated cookies
hive.server2.thrift.http.cookie.path
Path for the HS2 generated cookies
hive.server2.thrift.http.cookie.is.secure
true
Deprecated: Secure attribute of the HS2 generated cookie (this is automatically enabled for SSL enabled HiveServer2).
hive.server2.thrift.http.cookie.is.httponly
true
HttpOnly attribute of the HS2 generated cookie.
hive.server2.thrift.port
10000
Port number of HiveServer2 Thrift interface when hive.server2.transport.mode is 'binary'.
hive.server2.thrift.sasl.qop
auth
Expects one of [auth, auth-int, auth-conf].
Sasl QOP value; set it to one of following values to enable higher levels of
protection for HiveServer2 communication with clients.
Setting hadoop.rpc.protection to a higher level than HiveServer2 does not
make sense in most situations. HiveServer2 ignores hadoop.rpc.protection in favor
of hive.server2.thrift.sasl.qop.
"auth" - authentication only (default)
"auth-int" - authentication plus integrity protection
"auth-conf" - authentication plus integrity and confidentiality protection
This is applicable only if HiveServer2 is configured to use Kerberos authentication.
hive.server2.thrift.min.worker.threads
5
Minimum number of Thrift worker threads
hive.server2.thrift.max.worker.threads
500
Maximum number of Thrift worker threads
hive.server2.thrift.exponential.backoff.slot.length
100ms
Expects a time value with unit (d/day, h/hour, m/min, s/sec, ms/msec, us/usec, ns/nsec), which is msec if not specified.
Binary exponential backoff slot time for Thrift clients during login to HiveServer2,
for retries until hitting Thrift client timeout
hive.server2.thrift.login.timeout
20s
Expects a time value with unit (d/day, h/hour, m/min, s/sec, ms/msec, us/usec, ns/nsec), which is sec if not specified.
Timeout for Thrift clients during login to HiveServer2
hive.server2.thrift.worker.keepalive.time
60s
Expects a time value with unit (d/day, h/hour, m/min, s/sec, ms/msec, us/usec, ns/nsec), which is sec if not specified.
Keepalive time (in seconds) for an idle worker thread. When the number of workers exceeds min workers, excessive threads are killed after this time interval.
hive.server2.async.exec.threads
100
Number of threads in the async thread pool for HiveServer2
hive.server2.async.exec.shutdown.timeout
10s
Expects a time value with unit (d/day, h/hour, m/min, s/sec, ms/msec, us/usec, ns/nsec), which is sec if not specified.
How long HiveServer2 shutdown will wait for async threads to terminate.
hive.server2.async.exec.wait.queue.size
100
Size of the wait queue for async thread pool in HiveServer2.
After hitting this limit, the async thread pool will reject new requests.
hive.server2.async.exec.keepalive.time
10s
Expects a time value with unit (d/day, h/hour, m/min, s/sec, ms/msec, us/usec, ns/nsec), which is sec if not specified.
Time that an idle HiveServer2 async thread (from the thread pool) will wait for a new task
to arrive before terminating
hive.server2.async.exec.async.compile
false
Whether to enable compiling async query asynchronously. If enabled, it is unknown if the query will have any resultset before compilation completed.
hive.server2.long.polling.timeout
5000ms
Expects a time value with unit (d/day, h/hour, m/min, s/sec, ms/msec, us/usec, ns/nsec), which is msec if not specified.
Time that HiveServer2 will wait before responding to asynchronous calls that use long polling
hive.session.impl.classname
Classname for custom implementation of hive session
hive.session.impl.withugi.classname
Classname for custom implementation of hive session with UGI
hive.server2.authentication
NONE
Expects one of [nosasl, none, ldap, kerberos, pam, custom].
Client authentication types.
NONE: no authentication check
LDAP: LDAP/AD based authentication
KERBEROS: Kerberos/GSSAPI authentication
CUSTOM: Custom authentication provider
(Use with property hive.server2.custom.authentication.class)
PAM: Pluggable authentication module
NOSASL: Raw transport
hive.server2.allow.user.substitution
true
Allow alternate user to be specified as part of HiveServer2 open connection request.
hive.server2.authentication.kerberos.keytab
Kerberos keytab file for server principal
hive.server2.authentication.kerberos.principal
Kerberos server principal
hive.server2.authentication.spnego.keytab
keytab file for SPNego principal, optional,
typical value would look like /etc/security/keytabs/spnego.service.keytab,
This keytab would be used by HiveServer2 when Kerberos security is enabled and
HTTP transport mode is used.
This needs to be set only if SPNEGO is to be used in authentication.
SPNego authentication would be honored only if valid
hive.server2.authentication.spnego.principal
and
hive.server2.authentication.spnego.keytab
are specified.
hive.server2.authentication.spnego.principal
SPNego service principal, optional,
typical value would look like HTTP/[email protected]
SPNego service principal would be used by HiveServer2 when Kerberos security is enabled
and HTTP transport mode is used.
This needs to be set only if SPNEGO is to be used in authentication.
hive.server2.authentication.ldap.url
LDAP connection URL(s),
this value could contain URLs to mutiple LDAP servers instances for HA,
each LDAP URL is separated by a SPACE character. URLs are used in the
order specified until a connection is successful.
hive.server2.authentication.ldap.baseDN
LDAP base DN
hive.server2.authentication.ldap.Domain
hive.server2.authentication.ldap.groupDNPattern
COLON-separated list of patterns to use to find DNs for group entities in this directory.
Use %s where the actual group name is to be substituted for.
For example: CN=%s,CN=Groups,DC=subdomain,DC=domain,DC=com.
hive.server2.authentication.ldap.groupFilter
COMMA-separated list of LDAP Group names (short name not full DNs).
For example: HiveAdmins,HadoopAdmins,Administrators
hive.server2.authentication.ldap.userDNPattern
COLON-separated list of patterns to use to find DNs for users in this directory.
Use %s where the actual group name is to be substituted for.
For example: CN=%s,CN=Users,DC=subdomain,DC=domain,DC=com.
hive.server2.authentication.ldap.userFilter
COMMA-separated list of LDAP usernames (just short names, not full DNs).
For example: hiveuser,impalauser,hiveadmin,hadoopadmin
hive.server2.authentication.ldap.guidKey
uid
LDAP attribute name whose values are unique in this LDAP server.
For example: uid or CN.
hive.server2.authentication.ldap.groupMembershipKey
member
LDAP attribute name on the group object that contains the list of distinguished names
for the user, group, and contact objects that are members of the group.
For example: member, uniqueMember or memberUid
hive.server2.authentication.ldap.userMembershipKey
LDAP attribute name on the user object that contains groups of which the user is
a direct member, except for the primary group, which is represented by the
primaryGroupId.
For example: memberOf
hive.server2.authentication.ldap.groupClassKey
groupOfNames
LDAP attribute name on the group entry that is to be used in LDAP group searches.
For example: group, groupOfNames or groupOfUniqueNames.
hive.server2.authentication.ldap.customLDAPQuery
A full LDAP query that LDAP Atn provider uses to execute against LDAP Server.
If this query returns a null resultset, the LDAP Provider fails the Authentication
request, succeeds if the user is part of the resultset.For example: (&(objectClass=group)(objectClass=top)(instanceType=4)(cn=Domain*))
(&(objectClass=person)(|(sAMAccountName=admin)(|(memberOf=CN=Domain Admins,CN=Users,DC=domain,DC=com)(memberOf=CN=Administrators,CN=Builtin,DC=domain,DC=com))))
hive.server2.custom.authentication.class
Custom authentication class. Used when property
'hive.server2.authentication' is set to 'CUSTOM'. Provided class
must be a proper implementation of the interface
org.apache.hive.service.auth.PasswdAuthenticationProvider. HiveServer2
will call its Authenticate(user, passed) method to authenticate requests.
The implementation may optionally implement Hadoop's
org.apache.hadoop.conf.Configurable class to grab Hive's Configuration object.
hive.server2.authentication.pam.services
List of the underlying pam services that should be used when auth type is PAM
A file with the same name must exist in /etc/pam.d
hive.server2.enable.doAs
true
Setting this property to true will have HiveServer2 execute
Hive operations as the user making the calls to it.
hive.server2.table.type.mapping
CLASSIC
Expects one of [classic, hive].
This setting reflects how HiveServer2 will report the table types for JDBC and other
client implementations that retrieve the available tables and supported table types
HIVE : Exposes Hive's native table types like MANAGED_TABLE, EXTERNAL_TABLE, VIRTUAL_VIEW
CLASSIC : More generic types like TABLE and VIEW
hive.server2.session.hook
hive.server2.use.SSL
false
Set this to true for using SSL encryption in HiveServer2.
hive.server2.keystore.path
SSL certificate keystore location.
hive.server2.keystore.password
SSL certificate keystore password.
hive.server2.map.fair.scheduler.queue
true
If the YARN fair scheduler is configured and HiveServer2 is running in non-impersonation mode,
this setting determines the user for fair scheduler queue mapping.
If set to true (default), the logged-in user determines the fair scheduler queue
for submitted jobs, so that map reduce resource usage can be tracked by user.
If set to false, all Hive jobs go to the 'hive' user's queue.
hive.server2.builtin.udf.whitelist
Comma separated list of builtin udf names allowed in queries.
An empty whitelist allows all builtin udfs to be executed. The udf black list takes precedence over udf white list
hive.server2.builtin.udf.blacklist
Comma separated list of udfs names. These udfs will not be allowed in queries. The udf black list takes precedence over udf white list
hive.allow.udf.load.on.demand
false
Whether enable loading UDFs from metastore on demand; this is mostly relevant for
HS2 and was the default behavior before Hive 1.2. Off by default.
hive.server2.session.check.interval
6h
Expects a time value with unit (d/day, h/hour, m/min, s/sec, ms/msec, us/usec, ns/nsec), which is msec if not specified.
The time should be bigger than or equal to 3000 msec.
The check interval for session/operation timeout, which can be disabled by setting to zero or negative value.
hive.server2.close.session.on.disconnect
true
Session will be closed when connection is closed. Set this to false to have session outlive its parent connection.
hive.server2.idle.session.timeout
7d
Expects a time value with unit (d/day, h/hour, m/min, s/sec, ms/msec, us/usec, ns/nsec), which is msec if not specified.
Session will be closed when it's not accessed for this duration, which can be disabled by setting to zero or negative value.
hive.server2.idle.operation.timeout
5d
Expects a time value with unit (d/day, h/hour, m/min, s/sec, ms/msec, us/usec, ns/nsec), which is msec if not specified.
Operation will be closed when it's not accessed for this duration of time, which can be disabled by setting to zero value.
With positive value, it's checked for operations in terminal state only (FINISHED, CANCELED, CLOSED, ERROR).
With negative value, it's checked for all of the operations regardless of state.
hive.server2.idle.session.check.operation
true
Session will be considered to be idle only if there is no activity, and there is no pending operation.
This setting takes effect only if session idle timeout (hive.server2.idle.session.timeout) and checking
(hive.server2.session.check.interval) are enabled.
hive.server2.thrift.client.retry.limit
1
Number of retries upon failure of Thrift HiveServer2 calls
hive.server2.thrift.client.connect.retry.limit
1
Number of retries while opening a connection to HiveServe2
hive.server2.thrift.client.retry.delay.seconds
1s
Expects a time value with unit (d/day, h/hour, m/min, s/sec, ms/msec, us/usec, ns/nsec), which is sec if not specified.
Number of seconds for the HiveServer2 thrift client to wait between consecutive connection attempts. Also specifies the time to wait between retrying thrift calls upon failures
hive.server2.thrift.client.user
anonymous
Username to use against thrift client
hive.server2.thrift.client.password
anonymous
Password to use against thrift client
hive.server2.thrift.resultset.serialize.in.tasks
false
Whether we should serialize the Thrift structures used in JDBC ResultSet RPC in task nodes.
We use SequenceFile and ThriftJDBCBinarySerDe to read and write the final results if this is true.
hive.server2.thrift.resultset.max.fetch.size
10000
Max number of rows sent in one Fetch RPC call by the server to the client.
hive.server2.thrift.resultset.default.fetch.size
1000
The number of rows sent in one Fetch RPC call by the server to the client, if not
specified by the client.
hive.server2.xsrf.filter.enabled
false
If enabled, HiveServer2 will block any requests made to it over http if an X-XSRF-HEADER header is not present
hive.security.command.whitelist
set,reset,dfs,add,list,delete,reload,compile
Comma separated list of non-SQL Hive commands users are authorized to execute
hive.server2.job.credential.provider.path
If set, this configuration property should provide a comma-separated list of URLs that indicates the type and location of providers to be used by hadoop credential provider API. It provides HiveServer2 the ability to provide job-specific credential providers for jobs run using MR and Spark execution engines. This functionality has not been tested against Tez.
hive.mv.files.thread
15
Expects a byte size value with unit (blank for bytes, kb, mb, gb, tb, pb).
The size should be in between 0Pb (inclusive) and 1Kb (inclusive).
Number of threads used to move files in move task. Set it to 0 to disable multi-threaded file moves. This parameter is also used by MSCK to check tables.
hive.load.dynamic.partitions.thread
15
Expects a byte size value with unit (blank for bytes, kb, mb, gb, tb, pb).
The size should be in between 1 bytes (inclusive) and 1Kb (inclusive).
Number of threads used to load dynamic partitions.
hive.multi.insert.move.tasks.share.dependencies
false
If this is set all move tasks for tables/partitions (not directories) at the end of a
multi-insert query will only begin once the dependencies for all these move tasks have been
met.
Advantages: If concurrency is enabled, the locks will only be released once the query has
finished, so with this config enabled, the time when the table/partition is
generated will be much closer to when the lock on it is released.
Disadvantages: If concurrency is not enabled, with this disabled, the tables/partitions which
are produced by this query and finish earlier will be available for querying
much earlier. Since the locks are only released once the query finishes, this
does not apply if concurrency is enabled.
hive.exec.infer.bucket.sort
false
If this is set, when writing partitions, the metadata will include the bucketing/sorting
properties with which the data was written if any (this will not overwrite the metadata
inherited from the table if the table is bucketed/sorted)
hive.exec.infer.bucket.sort.num.buckets.power.two
false
If this is set, when setting the number of reducers for the map reduce task which writes the
final output files, it will choose a number which is a power of two, unless the user specifies
the number of reducers to use using mapred.reduce.tasks. The number of reducers
may be set to a power of two, only to be followed by a merge task meaning preventing
anything from being inferred.
With hive.exec.infer.bucket.sort set to true:
Advantages: If this is not set, the number of buckets for partitions will seem arbitrary,
which means that the number of mappers used for optimized joins, for example, will
be very low. With this set, since the number of buckets used for any partition is
a power of two, the number of mappers used for optimized joins will be the least
number of buckets used by any partition being joined.
Disadvantages: This may mean a much larger or much smaller number of reducers being used in the
final map reduce job, e.g. if a job was originally going to take 257 reducers,
it will now take 512 reducers, similarly if the max number of reducers is 511,
and a job was going to use this many, it will now use 256 reducers.
hive.optimize.listbucketing
false
Enable list bucketing optimizer. Default value is false so that we disable it by default.
hive.server.read.socket.timeout
10s
Expects a time value with unit (d/day, h/hour, m/min, s/sec, ms/msec, us/usec, ns/nsec), which is sec if not specified.
Timeout for the HiveServer to close the connection if no response from the client. By default, 10 seconds.
hive.server.tcp.keepalive
true
Whether to enable TCP keepalive for the Hive Server. Keepalive will prevent accumulation of half-open connections.
hive.decode.partition.name
false
Whether to show the unquoted partition names in query results.
hive.execution.engine
#tez
mr
Expects one of [mr, tez, spark].
Chooses execution engine. Options are: mr (Map reduce, default), tez, spark. While MR
remains the default engine for historical reasons, it is itself a historical engine
and is deprecated in Hive 2 line. It may be removed without further warning.
hive.execution.mode
container
Expects one of [container, llap].
Chooses whether query fragments will run in container or in llap
hive.jar.directory
This is the location hive in tez mode will look for to find a site wide
installed hive instance.
hive.user.install.directory
/user/
If hive (in tez mode only) cannot find a usable hive jar in "hive.jar.directory",
it will upload the hive jar to "hive.user.install.directory/user.name"
and use it to run queries.
hive.vectorized.execution.enabled
false
This flag should be set to true to enable vectorized mode of query execution.
The default value is false.
hive.vectorized.execution.reduce.enabled
true
This flag should be set to true to enable vectorized mode of the reduce-side of query execution.
The default value is true.
hive.vectorized.execution.reduce.groupby.enabled
true
This flag should be set to true to enable vectorized mode of the reduce-side GROUP BY query execution.
The default value is true.
hive.vectorized.execution.mapjoin.native.enabled
true
This flag should be set to true to enable native (i.e. non-pass through) vectorization
of queries using MapJoin.
The default value is true.
hive.vectorized.execution.mapjoin.native.multikey.only.enabled
false
This flag should be set to true to restrict use of native vector map join hash tables to
the MultiKey in queries using MapJoin.
The default value is false.
hive.vectorized.execution.mapjoin.minmax.enabled
false
This flag should be set to true to enable vector map join hash tables to
use max / max filtering for integer join queries using MapJoin.
The default value is false.
hive.vectorized.execution.mapjoin.overflow.repeated.threshold
-1
The number of small table rows for a match in vector map join hash tables
where we use the repeated field optimization in overflow vectorized row batch for join queries using MapJoin.
A value of -1 means do use the join result optimization. Otherwise, threshold value can be 0 to maximum integer.
hive.vectorized.execution.mapjoin.native.fast.hashtable.enabled
false
This flag should be set to true to enable use of native fast vector map join hash tables in
queries using MapJoin.
The default value is false.
hive.vectorized.groupby.checkinterval
100000
Number of entries added to the group by aggregation hash before a recomputation of average entry size is performed.
hive.vectorized.groupby.maxentries
1000000
Max number of entries in the vector group by aggregation hashtables.
Exceeding this will trigger a flush irrelevant of memory pressure condition.
hive.vectorized.groupby.flush.percent
0.1
Percent of entries in the group by aggregation hash flushed when the memory threshold is exceeded.
hive.vectorized.execution.reducesink.new.enabled
true
This flag should be set to true to enable the new vectorization
of queries using ReduceSink.
iThe default value is true.
hive.vectorized.use.vectorized.input.format
true
This flag should be set to true to enable vectorizing with vectorized input file format capable SerDe.
The default value is true.
hive.vectorized.use.vector.serde.deserialize
true
This flag should be set to true to enable vectorizing rows using vector deserialize.
The default value is true.
hive.vectorized.use.row.serde.deserialize
false
This flag should be set to true to enable vectorizing using row deserialize.
The default value is false.
hive.vectorized.adaptor.usage.mode
all
Expects one of [none, chosen, all].
Specifies the extent to which the VectorUDFAdaptor will be used for UDFs that do not have a cooresponding vectorized class.
0. none : disable any usage of VectorUDFAdaptor
1. chosen : use VectorUDFAdaptor for a small set of UDFs that were choosen for good performance
2. all : use VectorUDFAdaptor for all UDFs
hive.typecheck.on.insert
true
This property has been extended to control whether to check, convert, and normalize partition value to conform to its column type in partition operations including but not limited to insert, such as alter, describe etc.
hive.hadoop.classpath
For Windows OS, we need to pass HIVE_HADOOP_CLASSPATH Java parameter while starting HiveServer2
using "-hiveconf hive.hadoop.classpath=%HIVE_LIB%".
hive.rpc.query.plan
false
Whether to send the query plan via local resource or RPC
hive.compute.splits.in.am
true
Whether to generate the splits locally or in the AM (tez only)
hive.tez.input.generate.consistent.splits
true
Whether to generate consistent split locations when generating splits in the AM
hive.prewarm.enabled
false
Enables container prewarm for Tez/Spark (Hadoop 2 only)
hive.prewarm.numcontainers
10
Controls the number of containers to prewarm for Tez/Spark (Hadoop 2 only)
hive.stageid.rearrange
none
Expects one of [none, idonly, traverse, execution].
hive.explain.dependency.append.tasktype
false
hive.counters.group.name
HIVE
The name of counter group for internal Hive variables (CREATED_FILE, FATAL_ERROR, etc.)
hive.support.quoted.identifiers
column
Expects one of [none, column].
Whether to use quoted identifier. 'none' or 'column' can be used.
none: default(past) behavior. Implies only alphaNumeric and underscore are valid characters in identifiers.
column: implies column names can contain any character.
hive.support.special.characters.tablename
true
This flag should be set to true to enable support for special characters in table names.
When it is set to false, only [a-zA-Z_0-9]+ are supported.
The only supported special character right now is '/'. This flag applies only to quoted table names.
The default value is true.
hive.users.in.admin.role
Comma separated list of users who are in admin role for bootstrapping.
More users can be added in ADMIN role later.
hive.compat
0.12
Enable (configurable) deprecated behaviors by setting desired level of backward compatibility.
Setting to 0.12:
Maintains division behavior: int / int = double
hive.convert.join.bucket.mapjoin.tez
false
Whether joins can be automatically converted to bucket map joins in hive
when tez is used as the execution engine.
hive.exec.check.crossproducts
true
Check if a plan contains a Cross Product. If there is one, output a warning to the Session's console.
hive.localize.resource.wait.interval
5000ms
Expects a time value with unit (d/day, h/hour, m/min, s/sec, ms/msec, us/usec, ns/nsec), which is msec if not specified.
Time to wait for another thread to localize the same resource for hive-tez.
hive.localize.resource.num.wait.attempts
5
The number of attempts waiting for localizing a resource in hive-tez.
hive.tez.auto.reducer.parallelism
false
Turn on Tez' auto reducer parallelism feature. When enabled, Hive will still estimate data sizes
and set parallelism estimates. Tez will sample source vertices' output sizes and adjust the estimates at runtime as
necessary.
hive.tez.max.partition.factor
2.0
When auto reducer parallelism is enabled this factor will be used to over-partition data in shuffle edges.
hive.tez.min.partition.factor
0.25
When auto reducer parallelism is enabled this factor will be used to put a lower limit to the number
of reducers that tez specifies.
hive.tez.bucket.pruning
false
When pruning is enabled, filters on bucket columns will be processed by
filtering the splits against a bitset of included buckets. This needs predicates
produced by hive.optimize.ppd and hive.optimize.index.filters.
hive.tez.bucket.pruning.compat
true
When pruning is enabled, handle possibly broken inserts due to negative hashcodes.
This occasionally doubles the data scan cost, but is default enabled for safety
hive.tez.dynamic.partition.pruning
true
When dynamic pruning is enabled, joins on partition keys will be processed by sending
events from the processing vertices to the Tez application master. These events will be
used to prune unnecessary partitions.
hive.tez.dynamic.partition.pruning.max.event.size
1048576
Maximum size of events sent by processors in dynamic pruning. If this size is crossed no pruning will take place.
hive.tez.dynamic.partition.pruning.max.data.size
104857600
Maximum total data size of events in dynamic pruning.
hive.tez.dynamic.semijoin.reduction
true
When dynamic semijoin is enabled, shuffle joins will perform a leaky semijoin before shuffle. This requires hive.tez.dynamic.partition.pruning to be enabled.
hive.tez.min.bloom.filter.entries
1000000
Bloom filter should be of at min certain size to be effective
hive.tez.max.bloom.filter.entries
100000000
Bloom filter should be of at max certain size to be effective
hive.tez.bloom.filter.factor
2.0
Bloom filter should be a multiple of this factor with nDV
hive.tez.bigtable.minsize.semijoin.reduction
1000000
Big table for runtime filteting should be of atleast this size
hive.tez.dynamic.semijoin.reduction.threshold
0.5
Only perform semijoin optimization if the estimated benefit at or above this fraction of the target table
hive.tez.smb.number.waves
0.5
The number of waves in which to run the SMB join. Account for cluster being occupied. Ideally should be 1 wave.
hive.tez.exec.print.summary
false
Display breakdown of execution steps, for every query executed by the shell.
hive.tez.exec.inplace.progress
true
Updates tez job execution progress in-place in the terminal when hive-cli is used.
hive.server2.in.place.progress
true
Allows hive server 2 to send progress bar update information. This is currently available only if the execution engine is tez.
hive.spark.exec.inplace.progress
true
Updates spark job execution progress in-place in the terminal.
hive.tez.container.max.java.heap.fraction
0.8
This is to override the tez setting with the same name
hive.tez.task.scale.memory.reserve-fraction.min
0.3
This is to override the tez setting tez.task.scale.memory.reserve-fraction
hive.tez.task.scale.memory.reserve.fraction.max
0.5
The maximum fraction of JVM memory which Tez will reserve for the processor
hive.tez.task.scale.memory.reserve.fraction
-1.0
The customized fraction of JVM memory which Tez will reserve for the processor
hive.llap.io.enabled
Whether the LLAP IO layer is enabled.
hive.llap.io.nonvector.wrapper.enabled
true
Whether the LLAP IO layer is enabled for non-vectorized queries that read inputs
that can be vectorized
hive.llap.io.memory.mode
cache
Expects one of [cache, none].
LLAP IO memory usage; 'cache' (the default) uses data and metadata cache with a
custom off-heap allocator, 'none' doesn't use either (this mode may result in
significant performance degradation)
hive.llap.io.allocator.alloc.min
256Kb
Expects a byte size value with unit (blank for bytes, kb, mb, gb, tb, pb).
Minimum allocation possible from LLAP buddy allocator. Allocations below that are
padded to minimum allocation. For ORC, should generally be the same as the expected
compression buffer size, or next lowest power of 2. Must be a power of 2.
hive.llap.io.allocator.alloc.max
16Mb
Expects a byte size value with unit (blank for bytes, kb, mb, gb, tb, pb).
Maximum allocation possible from LLAP buddy allocator. For ORC, should be as large as
the largest expected ORC compression buffer size. Must be a power of 2.
hive.llap.io.metadata.fraction
0.1
Temporary setting for on-heap metadata cache fraction of xmx, set to avoid potential
heap problems on very large datasets when on-heap metadata cache takes over
everything. -1 managed metadata and data together (which is more flexible). This
setting will be removed (in effect become -1) once ORC metadata cache is moved off-heap.
hive.llap.io.allocator.arena.count
8
Arena count for LLAP low-level cache; cache will be allocated in the steps of
(size/arena_count) bytes. This size must be <= 1Gb and >= max allocation; if it is
not the case, an adjusted size will be used. Using powers of 2 is recommended.
hive.llap.io.memory.size
1Gb
Expects a byte size value with unit (blank for bytes, kb, mb, gb, tb, pb).
Maximum size for IO allocator or ORC low-level cache.
hive.llap.io.allocator.direct
true
Whether ORC low-level cache should use direct allocation.
hive.llap.io.allocator.mmap
false
Whether ORC low-level cache should use memory mapped allocation (direct I/O).
This is recommended to be used along-side NVDIMM (DAX) or NVMe flash storage.
hive.llap.io.allocator.mmap.path
/tmp
Expects a writable directory on the local filesystem.
The directory location for mapping NVDIMM/NVMe flash storage into the ORC low-level cache.
hive.llap.io.use.lrfu
true
Whether ORC low-level cache should use LRFU cache policy instead of default (FIFO).
hive.llap.io.lrfu.lambda
0.01
Lambda for ORC low-level cache LRFU cache policy. Must be in [0, 1]. 0 makes LRFU
behave like LFU, 1 makes it behave like LRU, values in between balance accordingly.
hive.llap.cache.allow.synthetic.fileid
false
Whether LLAP cache should use synthetic file ID if real one is not available. Systems
like HDFS, Isilon, etc. provide a unique file/inode ID. On other FSes (e.g. local
FS), the cache would not work by default because LLAP is unable to uniquely track the
files; enabling this setting allows LLAP to generate file ID from the path, size and
modification time, which is almost certain to identify file uniquely. However, if you
use a FS without file IDs and rewrite files a lot (or are paranoid), you might want
to avoid this setting.
hive.llap.orc.gap.cache
true
Whether LLAP cache for ORC should remember gaps in ORC compression buffer read
estimates, to avoid re-reading the data that was read once and discarded because it
is unneeded. This is only necessary for ORC files written before HIVE-9660.
hive.llap.io.use.fileid.path
true
Whether LLAP should use fileId (inode)-based path to ensure better consistency for the
cases of file overwrites. This is supported on HDFS.
hive.llap.io.encode.enabled
true
Whether LLAP should try to re-encode and cache data for non-ORC formats. This is used
on LLAP Server side to determine if the infrastructure for that is initialized.
hive.llap.io.encode.formats
org.apache.hadoop.mapred.TextInputFormat,
The table input formats for which LLAP IO should re-encode and cache data.
Comma-separated list.
hive.llap.io.encode.alloc.size
256Kb
Expects a byte size value with unit (blank for bytes, kb, mb, gb, tb, pb).
Allocation size for the buffers used to cache encoded data from non-ORC files. Must
be a power of two between hive.llap.io.allocator.alloc.min and
hive.llap.io.allocator.alloc.max.
hive.llap.io.encode.vector.serde.enabled
true
Whether LLAP should use vectorized SerDe reader to read text data when re-encoding.
hive.llap.io.encode.vector.serde.async.enabled
true
Whether LLAP should use async mode in vectorized SerDe reader to read text data.
hive.llap.io.encode.slice.row.count
100000
Row count to use to separate cache slices when reading encoded data from row-based
inputs into LLAP cache, if this feature is enabled.
hive.llap.io.encode.slice.lrr
true
Whether to separate cache slices when reading encoded data from text inputs via MR
MR LineRecordRedader into LLAP cache, if this feature is enabled. Safety flag.
hive.llap.io.orc.time.counters
true
Whether to enable time counters for LLAP IO layer (time spent in HDFS, etc.)
hive.llap.auto.allow.uber
false
Whether or not to allow the planner to run vertices in the AM.
hive.llap.auto.enforce.tree
true
Enforce that all parents are in llap, before considering vertex
hive.llap.auto.enforce.vectorized
true
Enforce that inputs are vectorized, before considering vertex
hive.llap.auto.enforce.stats
true
Enforce that col stats are available, before considering vertex
hive.llap.auto.max.input.size
10737418240
Check input size, before considering vertex (-1 disables check)
hive.llap.auto.max.output.size
1073741824
Check output size, before considering vertex (-1 disables check)
hive.llap.skip.compile.udf.check
false
Whether to skip the compile-time check for non-built-in UDFs when deciding whether to
execute tasks in LLAP. Skipping the check allows executing UDFs from pre-localized
jars in LLAP; if the jars are not pre-localized, the UDFs will simply fail to load.
hive.llap.allow.permanent.fns
true
Whether LLAP decider should allow permanent UDFs.
hive.llap.execution.mode
none
Expects one of [auto, none, all, map, only].
Chooses whether query fragments will run in container or in llap
hive.llap.object.cache.enabled
true
Cache objects (plans, hashtables, etc) in llap
hive.llap.io.decoding.metrics.percentiles.intervals
30
Comma-delimited set of integers denoting the desired rollover intervals (in seconds)
for percentile latency metrics on the LLAP daemon IO decoding time.
hive.llap.queue.metrics.percentiles.intervals
hive.llap.io.threadpool.size
10
Specify the number of threads to use for low-level IO thread pool.
hive.llap.daemon.service.principal
The name of the LLAP daemon's service principal.
hive.llap.daemon.keytab.file
The path to the Kerberos Keytab file containing the LLAP daemon's service principal.
hive.llap.zk.sm.principal
The name of the principal to use to talk to ZooKeeper for ZooKeeper SecretManager.
hive.llap.zk.sm.keytab.file
The path to the Kerberos Keytab file containing the principal to use to talk to
ZooKeeper for ZooKeeper SecretManager.
hive.llap.webui.spnego.keytab
The path to the Kerberos Keytab file containing the LLAP WebUI SPNEGO principal.
Typical value would look like /etc/security/keytabs/spnego.service.keytab.
hive.llap.webui.spnego.principal
The LLAP WebUI SPNEGO service principal. Configured similarly to
hive.server2.webui.spnego.principal
hive.llap.task.principal
The name of the principal to use to run tasks. By default, the clients are required
to provide tokens to access HDFS/etc.
hive.llap.task.keytab.file
The path to the Kerberos Keytab file containing the principal to use to run tasks.
By default, the clients are required to provide tokens to access HDFS/etc.
hive.llap.zk.sm.connectionString
ZooKeeper connection string for ZooKeeper SecretManager.
hive.llap.zk.registry.user
In the LLAP ZooKeeper-based registry, specifies the username in the Zookeeper path.
This should be the hive user or whichever user is running the LLAP daemon.
hive.llap.zk.registry.namespace
In the LLAP ZooKeeper-based registry, overrides the ZK path namespace. Note that
using this makes the path management (e.g. setting correct ACLs) your responsibility.
hive.llap.daemon.acl
*
The ACL for LLAP daemon.
hive.llap.daemon.acl.blocked
The deny ACL for LLAP daemon.
hive.llap.management.acl
*
The ACL for LLAP daemon management.
hive.llap.management.acl.blocked
The deny ACL for LLAP daemon management.
hive.llap.remote.token.requires.signing
true
Expects one of [false, except_llap_owner, true].
Whether the token returned from LLAP management API should require fragment signing.
True by default; can be disabled to allow CLI to get tokens from LLAP in a secure
cluster by setting it to true or 'except_llap_owner' (the latter returns such tokens
to everyone except the user LLAP cluster is authenticating under).
hive.llap.daemon.delegation.token.lifetime
14d
Expects a time value with unit (d/day, h/hour, m/min, s/sec, ms/msec, us/usec, ns/nsec), which is sec if not specified.
LLAP delegation token lifetime, in seconds if specified without a unit.
hive.llap.management.rpc.port
15004
RPC port for LLAP daemon management service.
hive.llap.auto.auth
false
Whether or not to set Hadoop configs to enable auth in LLAP web app.
hive.llap.daemon.rpc.num.handlers
5
Number of RPC handlers for LLAP daemon.
hive.llap.daemon.work.dirs
Working directories for the daemon. This should not be set if running as a YARN
application via Slider. It must be set when not running via Slider on YARN. If the value
is set when running as a Slider YARN application, the specified value will be used.
hive.llap.daemon.yarn.shuffle.port
15551
YARN shuffle port for LLAP-daemon-hosted shuffle.
hive.llap.daemon.yarn.container.mb
-1
llap server yarn container size in MB. Used in LlapServiceDriver and package.py
hive.llap.daemon.queue.name
Queue name within which the llap slider application will run. Used in LlapServiceDriver and package.py
hive.llap.daemon.container.id
ContainerId of a running LlapDaemon. Used to publish to the registry
hive.llap.daemon.nm.address
NM Address host:rpcPort for the NodeManager on which the instance of the daemon is running.
Published to the llap registry. Should never be set by users
hive.llap.daemon.shuffle.dir.watcher.enabled
false
TODO doc
hive.llap.daemon.am.liveness.heartbeat.interval.ms
10000ms
Expects a time value with unit (d/day, h/hour, m/min, s/sec, ms/msec, us/usec, ns/nsec), which is msec if not specified.
Tez AM-LLAP heartbeat interval (milliseconds). This needs to be below the task timeout
interval, but otherwise as high as possible to avoid unnecessary traffic.
hive.llap.am.liveness.connection.timeout.ms
10000ms
Expects a time value with unit (d/day, h/hour, m/min, s/sec, ms/msec, us/usec, ns/nsec), which is msec if not specified.
Amount of time to wait on connection failures to the AM from an LLAP daemon before
considering the AM to be dead.
hive.llap.am.use.fqdn
false
Whether to use FQDN of the AM machine when submitting work to LLAP.
hive.llap.am.liveness.connection.sleep.between.retries.ms
2000ms
Expects a time value with unit (d/day, h/hour, m/min, s/sec, ms/msec, us/usec, ns/nsec), which is msec if not specified.
Sleep duration while waiting to retry connection failures to the AM from the daemon for
the general keep-alive thread (milliseconds).
hive.llap.task.scheduler.timeout.seconds
60s
Expects a time value with unit (d/day, h/hour, m/min, s/sec, ms/msec, us/usec, ns/nsec), which is sec if not specified.
Amount of time to wait before failing the query when there are no llap daemons running
(alive) in the cluster.
hive.llap.daemon.num.executors
4
Number of executors to use in LLAP daemon; essentially, the number of tasks that can be
executed in parallel.
hive.llap.daemon.am-reporter.max.threads
4
Maximum number of threads to be used for AM reporter. If this is lower than number of
executors in llap daemon, it would be set to number of executors at runtime.
hive.llap.daemon.rpc.port
0
The LLAP daemon RPC port.
hive.llap.daemon.memory.per.instance.mb
4096
The total amount of memory to use for the executors inside LLAP (in megabytes).
hive.llap.daemon.xmx.headroom
5%
The total amount of heap memory set aside by LLAP and not used by the executors. Can
be specified as size (e.g. '512Mb'), or percentage (e.g. '5%'). Note that the latter is
derived from the total daemon XMX, which can be different from the total executor
memory if the cache is on-heap; although that's not the default configuration.
hive.llap.daemon.vcpus.per.instance
4
The total number of vcpus to use for the executors inside LLAP.
hive.llap.daemon.num.file.cleaner.threads
1
Number of file cleaner threads in LLAP.
hive.llap.file.cleanup.delay.seconds
300s
Expects a time value with unit (d/day, h/hour, m/min, s/sec, ms/msec, us/usec, ns/nsec), which is sec if not specified.
How long to delay before cleaning up query files in LLAP (in seconds, for debugging).
hive.llap.daemon.service.hosts
Explicitly specified hosts to use for LLAP scheduling. Useful for testing. By default,
YARN registry is used.
hive.llap.daemon.service.refresh.interval.sec
60s
Expects a time value with unit (d/day, h/hour, m/min, s/sec, ms/msec, us/usec, ns/nsec), which is sec if not specified.
LLAP YARN registry service list refresh delay, in seconds.
hive.llap.daemon.communicator.num.threads
10
Number of threads to use in LLAP task communicator in Tez AM.
hive.llap.daemon.download.permanent.fns
false
Whether LLAP daemon should localize the resources for permanent UDFs.
hive.llap.task.scheduler.node.reenable.min.timeout.ms
200ms
Expects a time value with unit (d/day, h/hour, m/min, s/sec, ms/msec, us/usec, ns/nsec), which is msec if not specified.
Minimum time after which a previously disabled node will be re-enabled for scheduling,
in milliseconds. This may be modified by an exponential back-off if failures persist.
hive.llap.task.scheduler.node.reenable.max.timeout.ms
10000ms
Expects a time value with unit (d/day, h/hour, m/min, s/sec, ms/msec, us/usec, ns/nsec), which is msec if not specified.
Maximum time after which a previously disabled node will be re-enabled for scheduling,
in milliseconds. This may be modified by an exponential back-off if failures persist.
hive.llap.task.scheduler.node.disable.backoff.factor
1.5
Backoff factor on successive blacklists of a node due to some failures. Blacklist times
start at the min timeout and go up to the max timeout based on this backoff factor.
hive.llap.task.scheduler.num.schedulable.tasks.per.node
0
The number of tasks the AM TaskScheduler will try allocating per node. 0 indicates that
this should be picked up from the Registry. -1 indicates unlimited capacity; positive
values indicate a specific bound.
hive.llap.task.scheduler.locality.delay
0ms
Expects a time value with unit (d/day, h/hour, m/min, s/sec, ms/msec, us/usec, ns/nsec), which is msec if not specified.
The time should be in between -1 msec (inclusive) and 9223372036854775807 msec (inclusive).
Amount of time to wait before allocating a request which contains location information, to a location other than the ones requested. Set to -1 for an infinite delay, 0for no delay.
hive.llap.daemon.task.preemption.metrics.intervals
30,60,300
Comma-delimited set of integers denoting the desired rollover intervals (in seconds)
for percentile latency metrics. Used by LLAP daemon task scheduler metrics for
time taken to kill task (due to pre-emption) and useful time wasted by the task that
is about to be preempted.
hive.llap.daemon.task.scheduler.wait.queue.size
10
LLAP scheduler maximum queue size.
hive.llap.daemon.wait.queue.comparator.class.name
org.apache.hadoop.hive.llap.daemon.impl.comparator.ShortestJobFirstComparator
The priority comparator to use for LLAP scheduler prioroty queue. The built-in options
are org.apache.hadoop.hive.llap.daemon.impl.comparator.ShortestJobFirstComparator and
.....FirstInFirstOutComparator
hive.llap.daemon.task.scheduler.enable.preemption
true
Whether non-finishable running tasks (e.g. a reducer waiting for inputs) should be
preempted by finishable tasks inside LLAP scheduler.
hive.llap.task.communicator.connection.timeout.ms
16000ms
Expects a time value with unit (d/day, h/hour, m/min, s/sec, ms/msec, us/usec, ns/nsec), which is msec if not specified.
Connection timeout (in milliseconds) before a failure to an LLAP daemon from Tez AM.
hive.llap.task.communicator.listener.thread-count
30
The number of task communicator listener threads.
hive.llap.task.communicator.connection.sleep.between.retries.ms
2000ms
Expects a time value with unit (d/day, h/hour, m/min, s/sec, ms/msec, us/usec, ns/nsec), which is msec if not specified.
Sleep duration (in milliseconds) to wait before retrying on error when obtaining a
connection to LLAP daemon from Tez AM.
hive.llap.daemon.web.port
15002
LLAP daemon web UI port.
hive.llap.daemon.web.ssl
false
Whether LLAP daemon web UI should use SSL.
hive.llap.client.consistent.splits
false
Whether to setup split locations to match nodes on which llap daemons are running, instead of using the locations provided by the split itself. If there is no llap daemon running, fall back to locations provided by the split. This is effective only if hive.execution.mode is llap
hive.llap.validate.acls
true
Whether LLAP should reject permissive ACLs in some cases (e.g. its own management
protocol or ZK paths), similar to how ssh refuses a key with bad access permissions.
hive.llap.daemon.output.service.port
15003
LLAP daemon output service port
hive.llap.daemon.output.stream.timeout
120s
Expects a time value with unit (d/day, h/hour, m/min, s/sec, ms/msec, us/usec, ns/nsec), which is sec if not specified.
The timeout for the client to connect to LLAP output service and start the fragment
output after sending the fragment. The fragment will fail if its output is not claimed.
hive.llap.daemon.output.service.send.buffer.size
131072
Send buffer size to be used by LLAP daemon output service
hive.llap.daemon.output.service.max.pending.writes
8
Maximum number of queued writes allowed per connection when sending data
via the LLAP output service to external clients.
hive.llap.enable.grace.join.in.llap
false
Override if grace join should be allowed to run in llap.
hive.llap.hs2.coordinator.enabled
true
Whether to create the LLAP coordinator; since execution engine and container vs llap
settings are both coming from job configs, we don't know at start whether this should
be created. Default true.
hive.llap.daemon.logger
query-routing
Expects one of [query-routing, rfa, console].
logger used for llap-daemons.
hive.spark.use.op.stats
true
Whether to use operator stats to determine reducer parallelism for Hive on Spark. If this is false, Hive will use source table stats to determine reducer parallelism for all first level reduce tasks, and the maximum reducer parallelism from all parents for all the rest (second level and onward) reducer tasks.
hive.spark.use.file.size.for.mapjoin
false
If this is set to true, mapjoin optimization in Hive/Spark will use source file sizes associated with TableScan operator on the root of operator tree, instead of using operator statistics.
hive.spark.client.future.timeout
60s
Expects a time value with unit (d/day, h/hour, m/min, s/sec, ms/msec, us/usec, ns/nsec), which is sec if not specified.
Timeout for requests from Hive client to remote Spark driver.
hive.spark.job.monitor.timeout
60s
Expects a time value with unit (d/day, h/hour, m/min, s/sec, ms/msec, us/usec, ns/nsec), which is sec if not specified.
Timeout for job monitor to get Spark job state.
hive.spark.client.connect.timeout
1000ms
Expects a time value with unit (d/day, h/hour, m/min, s/sec, ms/msec, us/usec, ns/nsec), which is msec if not specified.
Timeout for remote Spark driver in connecting back to Hive client.
hive.spark.client.server.connect.timeout
90000ms
Expects a time value with unit (d/day, h/hour, m/min, s/sec, ms/msec, us/usec, ns/nsec), which is msec if not specified.
Timeout for handshake between Hive client and remote Spark driver. Checked by both processes.
hive.spark.client.secret.bits
256
Number of bits of randomness in the generated secret for communication between Hive client and remote Spark driver. Rounded down to the nearest multiple of 8.
hive.spark.client.rpc.threads
8
Max