HBase的这些配置参数你都懂了吗？

测试时发现理解这些参数都代表什么意义非常的重要，而且通过参数调优可以提高性能，希望仔细阅读一下每个属性代表的意义！

 

hbase.rootdir file:///tmp/hbase-${user.name}/hbase The directory shared by region servers and into which HBase persists. The URL should be 'fully-qualified' to include the filesystem scheme. For example, to specify the HDFS directory '/hbase' where the HDFS instance's namenode is running at namenode.example.org on port 9000, set this value to: hdfs://namenode.example.org:9000/hbase. By default HBase writes into /tmp. Change this configuration else all data will be lost on machine restart. hbase.master.port 60000 The port the HBase Master should bind to. hbase.cluster.distributed false The mode the cluster will be in. Possible values are false for standalone mode and true for distributed mode. If false, startup will run all HBase and ZooKeeper daemons together in the one JVM. hbase.tmp.dir /tmp/hbase-${user.name} Temporary directory on the local filesystem. Change this setting to point to a location more permanent than '/tmp' (The '/tmp' directory is often cleared on machine restart). hbase.master.info.port 60010 The port for the HBase Master web UI. Set to -1 if you do not want a UI instance run. hbase.master.info.bindAddress 0.0.0.0 The bind address for the HBase Master web UI hbase.client.write.buffer 2097152 Default size of the HTable clien write buffer in bytes. A bigger buffer takes more memory -- on both the client and server side since server instantiates the passed write buffer to process it -- but a larger buffer size reduces the number of RPCs made. For an estimate of server-side memory-used, evaluate hbase.client.write.buffer * hbase.regionserver.handler.count hbase.regionserver.port 60020 The port the HBase RegionServer binds to. hbase.regionserver.info.port 60030 The port for the HBase RegionServer web UI Set to -1 if you do not want the RegionServer UI to run. hbase.regionserver.info.port.auto false Whether or not the Master or RegionServer UI should search for a port to bind to. Enables automatic port search if hbase.regionserver.info.port is already in use. Useful for testing, turned off by default. hbase.regionserver.info.bindAddress 0.0.0.0 The address for the HBase RegionServer web UI hbase.regionserver.class org.apache.hadoop.hbase.ipc.HRegionInterface The RegionServer interface to use. Used by the client opening proxy to remote region server. hbase.client.pause 1000 General client pause value. Used mostly as value to wait before running a retry of a failed get, region lookup, etc. hbase.client.retries.number 10 Maximum retries. Used as maximum for all retryable operations such as fetching of the root region from root region server, getting a cell's value, starting a row update, etc. Default: 10. hbase.client.scanner.caching 1 Number of rows that will be fetched when calling next on a scanner if it is not served from (local, client) memory. Higher caching values will enable faster scanners but will eat up more memory and some calls of next may take longer and longer times when the cache is empty. Do not set this value such that the time between invocations is greater than the scanner timeout; i.e. hbase.regionserver.lease.period hbase.client.keyvalue.maxsize 10485760 Specifies the combined maximum allowed size of a KeyValue instance. This is to set an upper boundary for a single entry saved in a storage file. Since they cannot be split it helps avoiding that a region cannot be split any further because the data is too large. It seems wise to set this to a fraction of the maximum region size. Setting it to zero or less disables the check. hbase.regionserver.lease.period 60000 HRegion server lease period in milliseconds. Default is 60 seconds. Clients must report in within this period else they are considered dead. hbase.regionserver.handler.count 10 Count of RPC Server instances spun up on RegionServers Same property is used by the Master for count of master handlers. Default is 10. hbase.regionserver.msginterval 3000 Interval between messages from the RegionServer to Master in milliseconds. hbase.regionserver.flushlogentries 1 Sync the HLog to HDFS when it has accumulated this many entries. Default 1. Value is checked on every HLog.hflush hbase.regionserver.optionallogflushinterval 1000 Sync the HLog to the HDFS after this interval if it has not accumulated enough entries to trigger a sync. Default 1 second. Units: milliseconds. hbase.regionserver.regionSplitLimit 2147483647 Limit for the number of regions after which no more region splitting should take place. This is not a hard limit for the number of regions but acts as a guideline for the regionserver to stop splitting after a certain limit. Default is set to MAX_INT; i.e. do not block splitting. hbase.regionserver.logroll.period 3600000 Period at which we will roll the commit log regardless of how many edits it has. hbase.regionserver.hlog.reader.impl org.apache.hadoop.hbase.regionserver.wal.SequenceFileLogReader The HLog file reader implementation. hbase.regionserver.hlog.writer.impl org.apache.hadoop.hbase.regionserver.wal.SequenceFileLogWriter The HLog file writer implementation. hbase.regionserver.thread.splitcompactcheckfrequency 20000 How often a region server runs the split/compaction check. hbase.regionserver.nbreservationblocks 4 The number of resevoir blocks of memory release on OOME so we can cleanup properly before server shutdown. hbase.zookeeper.dns.interface default The name of the Network Interface from which a ZooKeeper server should report its IP address. hbase.zookeeper.dns.nameserver default The host name or IP address of the name server (DNS) which a ZooKeeper server should use to determine the host name used by the master for communication and display purposes. hbase.regionserver.dns.interface default The name of the Network Interface from which a region server should report its IP address. hbase.regionserver.dns.nameserver default The host name or IP address of the name server (DNS) which a region server should use to determine the host name used by the master for communication and display purposes. hbase.master.dns.interface default The name of the Network Interface from which a master should report its IP address. hbase.master.dns.nameserver default The host name or IP address of the name server (DNS) which a master should use to determine the host name used for communication and display purposes. hbase.balancer.period 300000 Period at which the region balancer runs in the Master. hbase.master.logcleaner.ttl 600000 Maximum time a HLog can stay in the .oldlogdir directory, after which it will be cleaned by a Master thread. hbase.master.logcleaner.plugins org.apache.hadoop.hbase.master.TimeToLiveLogCleaner A comma-separated list of LogCleanerDelegate invoked by the LogsCleaner service. These WAL/HLog cleaners are called in order, so put the HLog cleaner that prunes the most HLog files in front. To implement your own LogCleanerDelegate, just put it in HBase's classpath and add the fully qualified class name here. Always add the above default log cleaners in the list. hbase.regionserver.global.memstore.upperLimit 0.4 Maximum size of all memstores in a region server before new updates are blocked and flushes are forced. Defaults to 40% of heap hbase.regionserver.global.memstore.lowerLimit 0.35 When memstores are being forced to flush to make room in memory, keep flushing until we hit this mark. Defaults to 35% of heap. This value equal to hbase.regionserver.global.memstore.upperLimit causes the minimum possible flushing to occur when updates are blocked due to memstore limiting. hbase.server.thread.wakefrequency 10000 Time to sleep in between searches for work (in milliseconds). Used as sleep interval by service threads such as log roller. hbase.hregion.memstore.flush.size 67108864 Memstore will be flushed to disk if size of the memstore exceeds this number of bytes. Value is checked by a thread that runs every hbase.server.thread.wakefrequency. hbase.hregion.preclose.flush.size 5242880 If the memstores in a region are this size or larger when we go to close, run a "pre-flush" to clear out memstores before we put up the region closed flag and take the region offline. On close, a flush is run under the close flag to empty memory. During this time the region is offline and we are not taking on any writes. If the memstore content is large, this flush could take a long time to complete. The preflush is meant to clean out the bulk of the memstore before putting up the close flag and taking the region offline so the flush that runs under the close flag has little to do. hbase.hregion.memstore.block.multiplier 2 Block updates if memstore has hbase.hregion.block.memstore time hbase.hregion.flush.size bytes. Useful preventing runaway memstore during spikes in update traffic. Without an upper-bound, memstore fills such that when it flushes the resultant flush files take a long time to compact or split, or worse, we OOME. hbase.hregion.max.filesize 268435456 Maximum HStoreFile size. If any one of a column families' HStoreFiles has grown to exceed this value, the hosting HRegion is split in two. Default: 256M. hbase.hstore.compactionThreshold 3 If more than this number of HStoreFiles in any one HStore (one HStoreFile is written per flush of memstore) then a compaction is run to rewrite all HStoreFiles files as one. Larger numbers put off compaction but when it runs, it takes longer to complete. hbase.hstore.blockingStoreFiles 7 If more than this number of StoreFiles in any one Store (one StoreFile is written per flush of MemStore) then updates are blocked for this HRegion until a compaction is completed, or until hbase.hstore.blockingWaitTime has been exceeded. hbase.hstore.blockingWaitTime 90000 The time an HRegion will block updates for after hitting the StoreFile limit defined by hbase.hstore.blockingStoreFiles. After this time has elapsed, the HRegion will stop blocking updates even if a compaction has not been completed. Default: 90 seconds. hbase.hstore.compaction.max 10 Max number of HStoreFiles to compact per 'minor' compaction. hbase.hregion.majorcompaction 86400000 The time (in miliseconds) between 'major' compactions of all HStoreFiles in a region. Default: 1 day. Set to 0 to disable automated major compactions. hbase.mapreduce.hfileoutputformat.blocksize 65536 The mapreduce HFileOutputFormat writes storefiles/hfiles. This is the minimum hfile blocksize to emit. Usually in hbase, writing hfiles, the blocksize is gotten from the table schema (HColumnDescriptor) but in the mapreduce outputformat context, we don't have access to the schema so get blocksize from Configuation. The smaller you make the blocksize, the bigger your index and the less you fetch on a random-access. Set the blocksize down if you have small cells and want faster random-access of individual cells. hfile.block.cache.size 0.2 Percentage of maximum heap (-Xmx setting) to allocate to block cache used by HFile/StoreFile. Default of 0.2 means allocate 20%. Set to 0 to disable. hbase.hash.type murmur The hashing algorithm for use in HashFunction. Two values are supported now: murmur (MurmurHash) and jenkins (JenkinsHash). Used by bloom filters. zookeeper.session.timeout 180000 ZooKeeper session timeout. HBase passes this to the zk quorum as suggested maximum time for a session. See http://hadoop.apache.org/zookeeper/docs/current/zookeeperProgrammers.html#ch_zkSessions "The client sends a requested timeout, the server responds with the timeout that it can give the client. " In milliseconds. zookeeper.znode.parent /hbase Root ZNode for HBase in ZooKeeper. All of HBase's ZooKeeper files that are configured with a relative path will go under this node. By default, all of HBase's ZooKeeper file path are configured with a relative path, so they will all go under this directory unless changed. zookeeper.znode.rootserver root-region-server Path to ZNode holding root region location. This is written by the master and read by clients and region servers. If a relative path is given, the parent folder will be ${zookeeper.znode.parent}. By default, this means the root location is stored at /hbase/root-region-server. hbase.zookeeper.quorum localhost Comma separated list of servers in the ZooKeeper Quorum. For example, "host1.mydomain.com,host2.mydomain.com,host3.mydomain.com". By default this is set to localhost for local and pseudo-distributed modes of operation. For a fully-distributed setup, this should be set to a full list of ZooKeeper quorum servers. If HBASE_MANAGES_ZK is set in hbase-env.sh this is the list of servers which we will start/stop ZooKeeper on. hbase.zookeeper.peerport 2888 Port used by ZooKeeper peers to talk to each other. See http://hadoop.apache.org/zookeeper/docs/r3.1.1/zookeeperStarted.html#sc_RunningReplicatedZooKeeper for more information. hbase.zookeeper.leaderport 3888 Port used by ZooKeeper for leader election. See http://hadoop.apache.org/zookeeper/docs/r3.1.1/zookeeperStarted.html#sc_RunningReplicatedZooKeeper for more information. hbase.zookeeper.property.initLimit 10 Property from ZooKeeper's config zoo.cfg. The number of ticks that the initial synchronization phase can take. hbase.zookeeper.property.syncLimit 5 Property from ZooKeeper's config zoo.cfg. The number of ticks that can pass between sending a request and getting an acknowledgment. hbase.zookeeper.property.dataDir ${hbase.tmp.dir}/zookeeper Property from ZooKeeper's config zoo.cfg. The directory where the snapshot is stored. hbase.zookeeper.property.clientPort 2181 Property from ZooKeeper's config zoo.cfg. The port at which the clients will connect. hbase.zookeeper.property.maxClientCnxns 30 Property from ZooKeeper's config zoo.cfg. Limit on number of concurrent connections (at the socket level) that a single client, identified by IP address, may make to a single member of the ZooKeeper ensemble. Set high to avoid zk connection issues running standalone and pseudo-distributed. hbase.rest.port 8080 The port for the HBase REST server. hbase.rest.readonly false Defines the mode the REST server will be started in. Possible values are: false: All HTTP methods are permitted - GET/PUT/POST/DELETE. true: Only the GET method is permitted.