cassandra学习笔记
cassandra学习
一、简介
http://cassandra.apache.org/doc/latest/
https://www.tutorialspoint.com/cassandra/cassandra_data_model.htm
存储结构
CREATE TABLE example (
A text,
B text,
C text,
D text,
E text,
F text,
PRIMARY KEY ((A,B),C,D)
);
INSERT INTO example(A,B,C,D,E,F) VALUES ('a','b','c','d','e','f');
INSERT INTO example(A,B,C,D,E,F) VALUES ('a','b','c','g','h','j');
INSERT INTO example(A,B,C,D,E,F) VALUES ('a','b','j','k','l','m');
INSERT INTO example(A,B,C,D,E,F) VALUES ('a','n','o','p','q','r');
INSERT INTO example(A,B,C,D,E,F) VALUES ('s','t','u','v','w','x');
二、下载地址
http://www.apache.org/dyn/closer.lua/cassandra/2.2.8/apache-cassandra-2.2.8-bin.tar.gz
三、启动
1）进入~/apache-cassandra-2.2.8/bin 目录：
| 命令 | 备注 |
|---|---|
| ./cassandra | 启动 |
| ./cqlsh localhost | 连接cassandra |
2）执行./cassandra 启动命令：
➜ bin ./cassandra
INFO 13:10:18 Create new Keyspace: KSMetaData{name=system_traces, strategyClass=SimpleStrategy, strategyOptions={replication_factor=2}, cfMetaData={sessions=org.apache.cassandra.config.CFMetaData@758a3875[cfId=c5e99f16-8677-3914-b17e-960613512345,ksName=system_traces,cfName=sessions,cfType=Standard,comparator=org.apache.cassandra.db.marshal.CompositeType(org.apache.cassandra.db.marshal.UTF8Type,org.apache.cassandra.db.marshal.ColumnToCollectionType(706172616d6574657273:org.apache.cassandra.db.marshal.MapType(org.apache.cassandra.db.marshal.UTF8Type,org.apache.cassandra.db.marshal.UTF8Type))),comment=tracing sessions,readRepairChance=0.0,dcLocalReadRepairChance=0.0,gcGraceSeconds=0,defaultValidator=org.apache.cassandra.db.marshal.BytesType,keyValidator=org.apache.cassandra.db.marshal.UUIDType,minCompactionThreshold=4,maxCompactionThreshold=32,columnMetadata=[ColumnDefinition{name=client, type=org.apache.cassandra.db.marshal.InetAddressType, kind=REGULAR, componentIndex=0, indexName=null, indexType=null}, ColumnDefinition{name=command, type=org.apache.cassandra.db.marshal.UTF8Type, kind=REGULAR, componentIndex=0, indexName=null, indexType=null}, ColumnDefinition{name=session_id, type=org.apache.cassandra.db.marshal.UUIDType, kind=PARTITION_KEY, componentIndex=null, indexName=null, indexType=null}, ColumnDefinition{name=coordinator, type=org.apache.cassandra.db.marshal.InetAddressType, kind=REGULAR, componentIndex=0, indexName=null, indexType=null}, ColumnDefinition{name=request, type=org.apache.cassandra.db.marshal.UTF8Type, kind=REGULAR, componentIndex=0, indexName=null, indexType=null}, ColumnDefinition{name=started_at, type=org.apache.cassandra.db.marshal.TimestampType, kind=REGULAR, componentIndex=0, indexName=null, indexType=null}, ColumnDefinition{name=duration, type=org.apache.cassandra.db.marshal.Int32Type, kind=REGULAR, componentIndex=0, indexName=null, indexType=null}, ColumnDefinition{name=parameters, type=org.apache.cassandra.db.marshal.MapType(org.apache.cassandra.db.marshal.UTF8Type,org.apache.cassandra.db.marshal.UTF8Type), kind=REGULAR, componentIndex=0, indexName=null, indexType=null}],compactionStrategyClass=class org.apache.cassandra.db.compaction.SizeTieredCompactionStrategy,compactionStrategyOptions={},compressionParameters={sstable_compression=org.apache.cassandra.io.compress.LZ4Compressor},bloomFilterFpChance=0.01,memtableFlushPeriod=3600000,caching={"keys":"ALL", "rows_per_partition":"NONE"},defaultTimeToLive=0,minIndexInterval=128,maxIndexInterval=2048,speculativeRetry=99.0PERCENTILE,droppedColumns={},triggers=[],isDense=false], events=org.apache.cassandra.config.CFMetaData@385c6d59[cfId=8826e8e9-e16a-3728-8753-3bc1fc713c25,ksName=system_traces,cfName=events,cfType=Standard,comparator=org.apache.cassandra.db.marshal.CompositeType(org.apache.cassandra.db.marshal.TimeUUIDType,org.apache.cassandra.db.marshal.UTF8Type),comment=tracing events,readRepairChance=0.0,dcLocalReadRepairChance=0.0,gcGraceSeconds=0,defaultValidator=org.apache.cassandra.db.marshal.BytesType,keyValidator=org.apache.cassandra.db.marshal.UUIDType,minCompactionThreshold=4,maxCompactionThreshold=32,columnMetadata=[ColumnDefinition{name=activity, type=org.apache.cassandra.db.marshal.UTF8Type, kind=REGULAR, componentIndex=1, indexName=null, indexType=null}, ColumnDefinition{name=thread, type=org.apache.cassandra.db.marshal.UTF8Type, kind=REGULAR, componentIndex=1, indexName=null, indexType=null}, ColumnDefinition{name=session_id, type=org.apache.cassandra.db.marshal.UUIDType, kind=PARTITION_KEY, componentIndex=null, indexName=null, indexType=null}, ColumnDefinition{name=event_id, type=org.apache.cassandra.db.marshal.TimeUUIDType, kind=CLUSTERING_COLUMN, componentIndex=0, indexName=null, indexType=null}, ColumnDefinition{name=source, type=org.apache.cassandra.db.marshal.InetAddressType, kind=REGULAR, componentIndex=1, indexName=null, indexType=null}, ColumnDefinition{name=source_elapsed, type=org.apache.cassandra.db.marshal.Int32Type, kind=REGULAR, componentIndex=1, indexName=null, indexType=null}],compactionStrategyClass=class org.apache.cassandra.db.compaction.SizeTieredCompactionStrategy,compactionStrategyOptions={},compressionParameters={sstable_compression=org.apache.cassandra.io.compress.LZ4Compressor},bloomFilterFpChance=0.01,memtableFlushPeriod=3600000,caching={"keys":"ALL", "rows_per_partition":"NONE"},defaultTimeToLive=0,minIndexInterval=128,maxIndexInterval=2048,speculativeRetry=99.0PERCENTILE,droppedColumns={},triggers=[],isDense=false]}, durableWrites=true, userTypes=org.apache.cassandra.config.UTMetaData@2d70e448}
INFO 13:10:18 Writing Memtable-schema_keyspaces@1730498753(0.261KiB serialized bytes, 7 ops, 0%/0% of on/off-heap limit)
INFO 13:10:18 Writing Memtable-schema_columnfamilies@1114064844(31.533KiB serialized bytes, 507 ops, 0%/0% of on/off-heap limit)
INFO 13:10:18 Writing Memtable-schema_columns@36217111(53.858KiB serialized bytes, 1065 ops, 0%/0% of on/off-heap limit)
INFO 13:10:18 Writing Memtable-schema_triggers@462323136(0.008KiB serialized bytes, 1 ops, 0%/0% of on/off-heap limit)
INFO 13:10:18 Writing Memtable-schema_usertypes@688388391(0.008KiB serialized bytes, 1 ops, 0%/0% of on/off-heap limit)
INFO 13:10:18 Writing Memtable-schema_functions@93851770(0.008KiB serialized bytes, 1 ops, 0%/0% of on/off-heap limit)
INFO 13:10:18 Writing Memtable-schema_aggregates@1817313611(0.008KiB serialized bytes, 1 ops, 0%/0% of on/off-heap limit)
INFO 13:10:18 Loading org.apache.cassandra.config.CFMetaData@a883085[cfId=c5e99f16-8677-3914-b17e-960613512345,ksName=system_traces,cfName=sessions,cfType=Standard,comparator=org.apache.cassandra.db.marshal.CompositeType(org.apache.cassandra.db.marshal.UTF8Type,org.apache.cassandra.db.marshal.ColumnToCollectionType(706172616d6574657273:org.apache.cassandra.db.marshal.MapType(org.apache.cassandra.db.marshal.UTF8Type,org.apache.cassandra.db.marshal.UTF8Type))),comment=tracing sessions,readRepairChance=0.0,dcLocalReadRepairChance=0.0,gcGraceSeconds=0,defaultValidator=org.apache.cassandra.db.marshal.BytesType,keyValidator=org.apache.cassandra.db.marshal.UUIDType,minCompactionThreshold=4,maxCompactionThreshold=32,columnMetadata=[ColumnDefinition{name=client, type=org.apache.cassandra.db.marshal.InetAddressType, kind=REGULAR, componentIndex=0, indexName=null, indexType=null}, ColumnDefinition{name=command, type=org.apache.cassandra.db.marshal.UTF8Type, kind=REGULAR, componentIndex=0, indexName=null, indexType=null}, ColumnDefinition{name=session_id, type=org.apache.cassandra.db.marshal.UUIDType, kind=PARTITION_KEY, componentIndex=null, indexName=null, indexType=null}, ColumnDefinition{name=coordinator, type=org.apache.cassandra.db.marshal.InetAddressType, kind=REGULAR, componentIndex=0, indexName=null, indexType=null}, ColumnDefinition{name=request, type=org.apache.cassandra.db.marshal.UTF8Type, kind=REGULAR, componentIndex=0, indexName=null, indexType=null}, ColumnDefinition{name=started_at, type=org.apache.cassandra.db.marshal.TimestampType, kind=REGULAR, componentIndex=0, indexName=null, indexType=null}, ColumnDefinition{name=duration, type=org.apache.cassandra.db.marshal.Int32Type, kind=REGULAR, componentIndex=0, indexName=null, indexType=null}, ColumnDefinition{name=parameters, type=org.apache.cassandra.db.marshal.MapType(org.apache.cassandra.db.marshal.UTF8Type,org.apache.cassandra.db.marshal.UTF8Type), kind=REGULAR, componentIndex=0, indexName=null, indexType=null}],compactionStrategyClass=class org.apache.cassandra.db.compaction.SizeTieredCompactionStrategy,compactionStrategyOptions={},compressionParameters={sstable_compression=org.apache.cassandra.io.compress.LZ4Compressor},bloomFilterFpChance=0.01,memtableFlushPeriod=3600000,caching={"keys":"ALL", "rows_per_partition":"NONE"},defaultTimeToLive=0,minIndexInterval=128,maxIndexInterval=2048,speculativeRetry=99.0PERCENTILE,droppedColumns={},triggers=[],isDense=false]
INFO 13:10:18 Initializing system_traces.sessions
INFO 13:10:18 Loading org.apache.cassandra.config.CFMetaData@6d830a67[cfId=8826e8e9-e16a-3728-8753-3bc1fc713c25,ksName=system_traces,cfName=events,cfType=Standard,comparator=org.apache.cassandra.db.marshal.CompositeType(org.apache.cassandra.db.marshal.TimeUUIDType,org.apache.cassandra.db.marshal.UTF8Type),comment=tracing events,readRepairChance=0.0,dcLocalReadRepairChance=0.0,gcGraceSeconds=0,defaultValidator=org.apache.cassandra.db.marshal.BytesType,keyValidator=org.apache.cassandra.db.marshal.UUIDType,minCompactionThreshold=4,maxCompactionThreshold=32,columnMetadata=[ColumnDefinition{name=activity, type=org.apache.cassandra.db.marshal.UTF8Type, kind=REGULAR, componentIndex=1, indexName=null, indexType=null}, ColumnDefinition{name=session_id, type=org.apache.cassandra.db.marshal.UUIDType, kind=PARTITION_KEY, componentIndex=null, indexName=null, indexType=null}, ColumnDefinition{name=thread, type=org.apache.cassandra.db.marshal.UTF8Type, kind=REGULAR, componentIndex=1, indexName=null, indexType=null}, ColumnDefinition{name=event_id, type=org.apache.cassandra.db.marshal.TimeUUIDType, kind=CLUSTERING_COLUMN, componentIndex=0, indexName=null, indexType=null}, ColumnDefinition{name=source, type=org.apache.cassandra.db.marshal.InetAddressType, kind=REGULAR, componentIndex=1, indexName=null, indexType=null}, ColumnDefinition{name=source_elapsed, type=org.apache.cassandra.db.marshal.Int32Type, kind=REGULAR, componentIndex=1, indexName=null, indexType=null}],compactionStrategyClass=class org.apache.cassandra.db.compaction.SizeTieredCompactionStrategy,compactionStrategyOptions={},compressionParameters={sstable_compression=org.apache.cassandra.io.compress.LZ4Compressor},bloomFilterFpChance=0.01,memtableFlushPeriod=3600000,caching={"keys":"ALL", "rows_per_partition":"NONE"},defaultTimeToLive=0,minIndexInterval=128,maxIndexInterval=2048,speculativeRetry=99.0PERCENTILE,droppedColumns={},triggers=[],isDense=false]
INFO 13:10:18 Initializing system_traces.events
INFO 13:10:19 Create new Keyspace: KSMetaData{name=system_distributed, strategyClass=SimpleStrategy, strategyOptions={replication_factor=3}, cfMetaData={parent_repair_history=org.apache.cassandra.config.CFMetaData@5cb7be55[cfId=deabd734-b99d-3b9c-92e5-fd92eb5abf14,ksName=system_distributed,cfName=parent_repair_history,cfType=Standard,comparator=org.apache.cassandra.db.marshal.CompositeType(org.apache.cassandra.db.marshal.UTF8Type,org.apache.cassandra.db.marshal.ColumnToCollectionType(7265717565737465645f72616e676573:org.apache.cassandra.db.marshal.SetType(org.apache.cassandra.db.marshal.UTF8Type),7375636365737366756c5f72616e676573:org.apache.cassandra.db.marshal.SetType(org.apache.cassandra.db.marshal.UTF8Type),636f6c756d6e66616d696c795f6e616d6573:org.apache.cassandra.db.marshal.SetType(org.apache.cassandra.db.marshal.UTF8Type))),comment=Repair history,readRepairChance=0.0,dcLocalReadRepairChance=0.0,gcGraceSeconds=0,defaultValidator=org.apache.cassandra.db.marshal.BytesType,keyValidator=org.apache.cassandra.db.marshal.TimeUUIDType,minCompactionThreshold=4,maxCompactionThreshold=32,columnMetadata=[ColumnDefinition{name=requested_ranges, type=org.apache.cassandra.db.marshal.SetType(org.apache.cassandra.db.marshal.UTF8Type), kind=REGULAR, componentIndex=0, indexName=null, indexType=null}, ColumnDefinition{name=exception_message, type=org.apache.cassandra.db.marshal.UTF8Type, kind=REGULAR, componentIndex=0, indexName=null, indexType=null}, ColumnDefinition{name=keyspace_name, type=org.apache.cassandra.db.marshal.UTF8Type, kind=REGULAR, componentIndex=0, indexName=null, indexType=null}, ColumnDefinition{name=successful_ranges, type=org.apache.cassandra.db.marshal.SetType(org.apache.cassandra.db.marshal.UTF8Type), kind=REGULAR, componentIndex=0, indexName=null, indexType=null}, ColumnDefinition{name=started_at, type=org.apache.cassandra.db.marshal.TimestampType, kind=REGULAR, componentIndex=0, indexName=null, indexType=null}, ColumnDefinition{name=finished_at, type=org.apache.cassandra.db.marshal.TimestampType, kind=REGULAR, componentIndex=0, indexName=null, indexType=null}, ColumnDefinition{name=exception_stacktrace, type=org.apache.cassandra.db.marshal.UTF8Type, kind=REGULAR, componentIndex=0, indexName=null, indexType=null}, ColumnDefinition{name=columnfamily_names, type=org.apache.cassandra.db.marshal.SetType(org.apache.cassandra.db.marshal.UTF8Type), kind=REGULAR, componentIndex=0, indexName=null, indexType=null}, ColumnDefinition{name=parent_id, type=org.apache.cassandra.db.marshal.TimeUUIDType, kind=PARTITION_KEY, componentIndex=null, indexName=null, indexType=null}],compactionStrategyClass=class org.apache.cassandra.db.compaction.SizeTieredCompactionStrategy,compactionStrategyOptions={},compressionParameters={sstable_compression=org.apache.cassandra.io.compress.LZ4Compressor},bloomFilterFpChance=0.01,memtableFlushPeriod=3600000,caching={"keys":"ALL", "rows_per_partition":"NONE"},defaultTimeToLive=0,minIndexInterval=128,maxIndexInterval=2048,speculativeRetry=99.0PERCENTILE,droppedColumns={},triggers=[],isDense=false], repair_history=org.apache.cassandra.config.CFMetaData@4b9e021f[cfId=759fffad-624b-3181-80ee-fa9a52d1f627,ksName=system_distributed,cfName=repair_history,cfType=Standard,comparator=org.apache.cassandra.db.marshal.CompositeType(org.apache.cassandra.db.marshal.TimeUUIDType,org.apache.cassandra.db.marshal.UTF8Type,org.apache.cassandra.db.marshal.ColumnToCollectionType(7061727469636970616e7473:org.apache.cassandra.db.marshal.SetType(org.apache.cassandra.db.marshal.InetAddressType))),comment=Repair history,readRepairChance=0.0,dcLocalReadRepairChance=0.0,gcGraceSeconds=0,defaultValidator=org.apache.cassandra.db.marshal.BytesType,keyValidator=org.apache.cassandra.db.marshal.CompositeType(org.apache.cassandra.db.marshal.UTF8Type,org.apache.cassandra.db.marshal.UTF8Type),minCompactionThreshold=4,maxCompactionThreshold=32,columnMetadata=[ColumnDefinition{name=status, type=org.apache.cassandra.db.marshal.UTF8Type, kind=REGULAR, componentIndex=1, indexName=null, indexType=null}, ColumnDefinition{name=id, type=org.apache.cassandra.db.marshal.TimeUUIDType, kind=CLUSTERING_COLUMN, componentIndex=0, indexName=null, indexType=null}, ColumnDefinition{name=coordinator, type=org.apache.cassandra.db.marshal.InetAddressType, kind=REGULAR, componentIndex=1, indexName=null, indexType=null}, ColumnDefinition{name=finished_at, type=org.apache.cassandra.db.marshal.TimestampType, kind=REGULAR, componentIndex=1, indexName=null, indexType=null}, ColumnDefinition{name=participants, type=org.apache.cassandra.db.marshal.SetType(org.apache.cassandra.db.marshal.InetAddressType), kind=REGULAR, componentIndex=1, indexName=null, indexType=null}, ColumnDefinition{name=exception_stacktrace, type=org.apache.cassandra.db.marshal.UTF8Type, kind=REGULAR, componentIndex=1, indexName=null, indexType=null}, ColumnDefinition{name=parent_id, type=org.apache.cassandra.db.marshal.TimeUUIDType, kind=REGULAR, componentIndex=1, indexName=null, indexType=null}, ColumnDefinition{name=range_end, type=org.apache.cassandra.db.marshal.UTF8Type, kind=REGULAR, componentIndex=1, indexName=null, indexType=null}, ColumnDefinition{name=range_begin, type=org.apache.cassandra.db.marshal.UTF8Type, kind=REGULAR, componentIndex=1, indexName=null, indexType=null}, ColumnDefinition{name=exception_message, type=org.apache.cassandra.db.marshal.UTF8Type, kind=REGULAR, componentIndex=1, indexName=null, indexType=null}, ColumnDefinition{name=keyspace_name, type=org.apache.cassandra.db.marshal.UTF8Type, kind=PARTITION_KEY, componentIndex=0, indexName=null, indexType=null}, ColumnDefinition{name=started_at, type=org.apache.cassandra.db.marshal.TimestampType, kind=REGULAR, componentIndex=1, indexName=null, indexType=null}, ColumnDefinition{name=columnfamily_name, type=org.apache.cassandra.db.marshal.UTF8Type, kind=PARTITION_KEY, componentIndex=1, indexName=null, indexType=null}],compactionStrategyClass=class org.apache.cassandra.db.compaction.SizeTieredCompactionStrategy,compactionStrategyOptions={},compressionParameters={sstable_compression=org.apache.cassandra.io.compress.LZ4Compressor},bloomFilterFpChance=0.01,memtableFlushPeriod=3600000,caching={"keys":"ALL", "rows_per_partition":"NONE"},defaultTimeToLive=0,minIndexInterval=128,maxIndexInterval=2048,speculativeRetry=99.0PERCENTILE,droppedColumns={},triggers=[],isDense=false]}, durableWrites=true, userTypes=org.apache.cassandra.config.UTMetaData@467b6850}
INFO 13:10:19 Writing Memtable-schema_keyspaces@1850671951(0.143KiB serialized bytes, 3 ops, 0%/0% of on/off-heap limit)
INFO 13:10:19 Writing Memtable-schema_columnfamilies@405770394(3.464KiB serialized bytes, 46 ops, 0%/0% of on/off-heap limit)
INFO 13:10:19 Writing Memtable-schema_columns@1479973311(8.548KiB serialized bytes, 154 ops, 0%/0% of on/off-heap limit)
INFO 13:10:19 Loading org.apache.cassandra.config.CFMetaData@60869928[cfId=deabd734-b99d-3b9c-92e5-fd92eb5abf14,ksName=system_distributed,cfName=parent_repair_history,cfType=Standard,comparator=org.apache.cassandra.db.marshal.CompositeType(org.apache.cassandra.db.marshal.UTF8Type,org.apache.cassandra.db.marshal.ColumnToCollectionType(7265717565737465645f72616e676573:org.apache.cassandra.db.marshal.SetType(org.apache.cassandra.db.marshal.UTF8Type),7375636365737366756c5f72616e676573:org.apache.cassandra.db.marshal.SetType(org.apache.cassandra.db.marshal.UTF8Type),636f6c756d6e66616d696c795f6e616d6573:org.apache.cassandra.db.marshal.SetType(org.apache.cassandra.db.marshal.UTF8Type))),comment=Repair history,readRepairChance=0.0,dcLocalReadRepairChance=0.0,gcGraceSeconds=0,defaultValidator=org.apache.cassandra.db.marshal.BytesType,keyValidator=org.apache.cassandra.db.marshal.TimeUUIDType,minCompactionThreshold=4,maxCompactionThreshold=32,columnMetadata=[ColumnDefinition{name=requested_ranges, type=org.apache.cassandra.db.marshal.SetType(org.apache.cassandra.db.marshal.UTF8Type), kind=REGULAR, componentIndex=0, indexName=null, indexType=null}, ColumnDefinition{name=exception_message, type=org.apache.cassandra.db.marshal.UTF8Type, kind=REGULAR, componentIndex=0, indexName=null, indexType=null}, ColumnDefinition{name=keyspace_name, type=org.apache.cassandra.db.marshal.UTF8Type, kind=REGULAR, componentIndex=0, indexName=null, indexType=null}, ColumnDefinition{name=successful_ranges, type=org.apache.cassandra.db.marshal.SetType(org.apache.cassandra.db.marshal.UTF8Type), kind=REGULAR, componentIndex=0, indexName=null, indexType=null}, ColumnDefinition{name=started_at, type=org.apache.cassandra.db.marshal.TimestampType, kind=REGULAR, componentIndex=0, indexName=null, indexType=null}, ColumnDefinition{name=finished_at, type=org.apache.cassandra.db.marshal.TimestampType, kind=REGULAR, componentIndex=0, indexName=null, indexType=null}, ColumnDefinition{name=exception_stacktrace, type=org.apache.cassandra.db.marshal.UTF8Type, kind=REGULAR, componentIndex=0, indexName=null, indexType=null}, ColumnDefinition{name=columnfamily_names, type=org.apache.cassandra.db.marshal.SetType(org.apache.cassandra.db.marshal.UTF8Type), kind=REGULAR, componentIndex=0, indexName=null, indexType=null}, ColumnDefinition{name=parent_id, type=org.apache.cassandra.db.marshal.TimeUUIDType, kind=PARTITION_KEY, componentIndex=null, indexName=null, indexType=null}],compactionStrategyClass=class org.apache.cassandra.db.compaction.SizeTieredCompactionStrategy,compactionStrategyOptions={},compressionParameters={sstable_compression=org.apache.cassandra.io.compress.LZ4Compressor},bloomFilterFpChance=0.01,memtableFlushPeriod=3600000,caching={"keys":"ALL", "rows_per_partition":"NONE"},defaultTimeToLive=0,minIndexInterval=128,maxIndexInterval=2048,speculativeRetry=99.0PERCENTILE,droppedColumns={},triggers=[],isDense=false]
INFO 13:10:19 Initializing system_distributed.parent_repair_history
INFO 13:10:19 Loading org.apache.cassandra.config.CFMetaData@323fa569[cfId=759fffad-624b-3181-80ee-fa9a52d1f627,ksName=system_distributed,cfName=repair_history,cfType=Standard,comparator=org.apache.cassandra.db.marshal.CompositeType(org.apache.cassandra.db.marshal.TimeUUIDType,org.apache.cassandra.db.marshal.UTF8Type,org.apache.cassandra.db.marshal.ColumnToCollectionType(7061727469636970616e7473:org.apache.cassandra.db.marshal.SetType(org.apache.cassandra.db.marshal.InetAddressType))),comment=Repair history,readRepairChance=0.0,dcLocalReadRepairChance=0.0,gcGraceSeconds=0,defaultValidator=org.apache.cassandra.db.marshal.BytesType,keyValidator=org.apache.cassandra.db.marshal.CompositeType(org.apache.cassandra.db.marshal.UTF8Type,org.apache.cassandra.db.marshal.UTF8Type),minCompactionThreshold=4,maxCompactionThreshold=32,columnMetadata=[ColumnDefinition{name=status, type=org.apache.cassandra.db.marshal.UTF8Type, kind=REGULAR, componentIndex=1, indexName=null, indexType=null}, ColumnDefinition{name=id, type=org.apache.cassandra.db.marshal.TimeUUIDType, kind=CLUSTERING_COLUMN, componentIndex=0, indexName=null, indexType=null}, ColumnDefinition{name=coordinator, type=org.apache.cassandra.db.marshal.InetAddressType, kind=REGULAR, componentIndex=1, indexName=null, indexType=null}, ColumnDefinition{name=finished_at, type=org.apache.cassandra.db.marshal.TimestampType, kind=REGULAR, componentIndex=1, indexName=null, indexType=null}, ColumnDefinition{name=participants, type=org.apache.cassandra.db.marshal.SetType(org.apache.cassandra.db.marshal.InetAddressType), kind=REGULAR, componentIndex=1, indexName=null, indexType=null}, ColumnDefinition{name=exception_stacktrace, type=org.apache.cassandra.db.marshal.UTF8Type, kind=REGULAR, componentIndex=1, indexName=null, indexType=null}, ColumnDefinition{name=parent_id, type=org.apache.cassandra.db.marshal.TimeUUIDType, kind=REGULAR, componentIndex=1, indexName=null, indexType=null}, ColumnDefinition{name=range_end, type=org.apache.cassandra.db.marshal.UTF8Type, kind=REGULAR, componentIndex=1, indexName=null, indexType=null}, ColumnDefinition{name=range_begin, type=org.apache.cassandra.db.marshal.UTF8Type, kind=REGULAR, componentIndex=1, indexName=null, indexType=null}, ColumnDefinition{name=exception_message, type=org.apache.cassandra.db.marshal.UTF8Type, kind=REGULAR, componentIndex=1, indexName=null, indexType=null}, ColumnDefinition{name=keyspace_name, type=org.apache.cassandra.db.marshal.UTF8Type, kind=PARTITION_KEY, componentIndex=0, indexName=null, indexType=null}, ColumnDefinition{name=started_at, type=org.apache.cassandra.db.marshal.TimestampType, kind=REGULAR, componentIndex=1, indexName=null, indexType=null}, ColumnDefinition{name=columnfamily_name, type=org.apache.cassandra.db.marshal.UTF8Type, kind=PARTITION_KEY, componentIndex=1, indexName=null, indexType=null}],compactionStrategyClass=class org.apache.cassandra.db.compaction.SizeTieredCompactionStrategy,compactionStrategyOptions={},compressionParameters={sstable_compression=org.apache.cassandra.io.compress.LZ4Compressor},bloomFilterFpChance=0.01,memtableFlushPeriod=3600000,caching={"keys":"ALL", "rows_per_partition":"NONE"},defaultTimeToLive=0,minIndexInterval=128,maxIndexInterval=2048,speculativeRetry=99.0PERCENTILE,droppedColumns={},triggers=[],isDense=false]
INFO 13:10:19 Initializing system_distributed.repair_history
INFO 13:10:19 Writing Memtable-local@1820980522(0.081KiB serialized bytes, 8 ops, 0%/0% of on/off-heap limit)
INFO 13:10:19 Writing Memtable-local@1300886093(8.380KiB serialized bytes, 259 ops, 0%/0% of on/off-heap limit)
INFO 13:10:19 Create new Keyspace: KSMetaData{name=system_auth, strategyClass=SimpleStrategy, strategyOptions={replication_factor=1}, cfMetaData={role_permissions=org.apache.cassandra.config.CFMetaData@2da8e456[cfId=3afbe79f-2194-31a7-add7-f5ab90d8ec9c,ksName=system_auth,cfName=role_permissions,cfType=Standard,comparator=org.apache.cassandra.db.marshal.CompositeType(org.apache.cassandra.db.marshal.UTF8Type,org.apache.cassandra.db.marshal.UTF8Type,org.apache.cassandra.db.marshal.ColumnToCollectionType(7065726d697373696f6e73:org.apache.cassandra.db.marshal.SetType(org.apache.cassandra.db.marshal.UTF8Type))),comment=permissions granted to db roles,readRepairChance=0.0,dcLocalReadRepairChance=0.0,gcGraceSeconds=7776000,defaultValidator=org.apache.cassandra.db.marshal.BytesType,keyValidator=org.apache.cassandra.db.marshal.UTF8Type,minCompactionThreshold=4,maxCompactionThreshold=32,columnMetadata=[ColumnDefinition{name=resource, type=org.apache.cassandra.db.marshal.UTF8Type, kind=CLUSTERING_COLUMN, componentIndex=0, indexName=null, indexType=null}, ColumnDefinition{name=role, type=org.apache.cassandra.db.marshal.UTF8Type, kind=PARTITION_KEY, componentIndex=null, indexName=null, indexType=null}, ColumnDefinition{name=permissions, type=org.apache.cassandra.db.marshal.SetType(org.apache.cassandra.db.marshal.UTF8Type), kind=REGULAR, componentIndex=1, indexName=null, indexType=null}],compactionStrategyClass=class org.apache.cassandra.db.compaction.SizeTieredCompactionStrategy,compactionStrategyOptions={},compressionParameters={sstable_compression=org.apache.cassandra.io.compress.LZ4Compressor},bloomFilterFpChance=0.01,memtableFlushPeriod=3600000,caching={"keys":"ALL", "rows_per_partition":"NONE"},defaultTimeToLive=0,minIndexInterval=128,maxIndexInterval=2048,speculativeRetry=99.0PERCENTILE,droppedColumns={},triggers=[],isDense=false], roles=org.apache.cassandra.config.CFMetaData@7fd294cb[cfId=5bc52802-de25-35ed-aeab-188eecebb090,ksName=system_auth,cfName=roles,cfType=Standard,comparator=org.apache.cassandra.db.marshal.CompositeType(org.apache.cassandra.db.marshal.UTF8Type,org.apache.cassandra.db.marshal.ColumnToCollectionType(6d656d6265725f6f66:org.apache.cassandra.db.marshal.SetType(org.apache.cassandra.db.marshal.UTF8Type))),comment=role definitions,readRepairChance=0.0,dcLocalReadRepairChance=0.0,gcGraceSeconds=7776000,defaultValidator=org.apache.cassandra.db.marshal.BytesType,keyValidator=org.apache.cassandra.db.marshal.UTF8Type,minCompactionThreshold=4,maxCompactionThreshold=32,columnMetadata=[ColumnDefinition{name=role, type=org.apache.cassandra.db.marshal.UTF8Type, kind=PARTITION_KEY, componentIndex=null, indexName=null, indexType=null}, ColumnDefinition{name=member_of, type=org.apache.cassandra.db.marshal.SetType(org.apache.cassandra.db.marshal.UTF8Type), kind=REGULAR, componentIndex=0, indexName=null, indexType=null}, ColumnDefinition{name=salted_hash, type=org.apache.cassandra.db.marshal.UTF8Type, kind=REGULAR, componentIndex=0, indexName=null, indexType=null}, ColumnDefinition{name=can_login, type=org.apache.cassandra.db.marshal.BooleanType, kind=REGULAR, componentIndex=0, indexName=null, indexType=null}, ColumnDefinition{name=is_superuser, type=org.apache.cassandra.db.marshal.BooleanType, kind=REGULAR, componentIndex=0, indexName=null, indexType=null}],compactionStrategyClass=class org.apache.cassandra.db.compaction.SizeTieredCompactionStrategy,compactionStrategyOptions={},compressionParameters={sstable_compression=org.apache.cassandra.io.compress.LZ4Compressor},bloomFilterFpChance=0.01,memtableFlushPeriod=3600000,caching={"keys":"ALL", "rows_per_partition":"NONE"},defaultTimeToLive=0,minIndexInterval=128,maxIndexInterval=2048,speculativeRetry=99.0PERCENTILE,droppedColumns={},triggers=[],isDense=false], resource_role_permissons_index=org.apache.cassandra.config.CFMetaData@71c8e59a[cfId=5f2fbdad-91f1-3946-bd25-d5da3a5c35ec,ksName=system_auth,cfName=resource_role_permissons_index,cfType=Standard,comparator=org.apache.cassandra.db.marshal.CompositeType(org.apache.cassandra.db.marshal.UTF8Type,org.apache.cassandra.db.marshal.UTF8Type),comment=index of db roles with permissions granted on a resource,readRepairChance=0.0,dcLocalReadRepairChance=0.0,gcGraceSeconds=7776000,defaultValidator=org.apache.cassandra.db.marshal.BytesType,keyValidator=org.apache.cassandra.db.marshal.UTF8Type,minCompactionThreshold=4,maxCompactionThreshold=32,columnMetadata=[ColumnDefinition{name=resource, type=org.apache.cassandra.db.marshal.UTF8Type, kind=PARTITION_KEY, componentIndex=null, indexName=null, indexType=null}, ColumnDefinition{name=role, type=org.apache.cassandra.db.marshal.UTF8Type, kind=CLUSTERING_COLUMN, componentIndex=0, indexName=null, indexType=null}],compactionStrategyClass=class org.apache.cassandra.db.compaction.SizeTieredCompactionStrategy,compactionStrategyOptions={},compressionParameters={sstable_compression=org.apache.cassandra.io.compress.LZ4Compressor},bloomFilterFpChance=0.01,memtableFlushPeriod=3600000,caching={"keys":"ALL", "rows_per_partition":"NONE"},defaultTimeToLive=0,minIndexInterval=128,maxIndexInterval=2048,speculativeRetry=99.0PERCENTILE,droppedColumns={},triggers=[],isDense=false], role_members=org.apache.cassandra.config.CFMetaData@46408804[cfId=0ecdaa87-f8fb-3e60-88d1-74fb36fe5c0d,ksName=system_auth,cfName=role_members,cfType=Standard,comparator=org.apache.cassandra.db.marshal.CompositeType(org.apache.cassandra.db.marshal.UTF8Type,org.apache.cassandra.db.marshal.UTF8Type),comment=role memberships lookup table,readRepairChance=0.0,dcLocalReadRepairChance=0.0,gcGraceSeconds=7776000,defaultValidator=org.apache.cassandra.db.marshal.BytesType,keyValidator=org.apache.cassandra.db.marshal.UTF8Type,minCompactionThreshold=4,maxCompactionThreshold=32,columnMetadata=[ColumnDefinition{name=role, type=org.apache.cassandra.db.marshal.UTF8Type, kind=PARTITION_KEY, componentIndex=null, indexName=null, indexType=null}, ColumnDefinition{name=member, type=org.apache.cassandra.db.marshal.UTF8Type, kind=CLUSTERING_COLUMN, componentIndex=0, indexName=null, indexType=null}],compactionStrategyClass=class org.apache.cassandra.db.compaction.SizeTieredCompactionStrategy,compactionStrategyOptions={},compressionParameters={sstable_compression=org.apache.cassandra.io.compress.LZ4Compressor},bloomFilterFpChance=0.01,memtableFlushPeriod=3600000,caching={"keys":"ALL", "rows_per_partition":"NONE"},defaultTimeToLive=0,minIndexInterval=128,maxIndexInterval=2048,speculativeRetry=99.0PERCENTILE,droppedColumns={},triggers=[],isDense=false]}, durableWrites=true, userTypes=org.apache.cassandra.config.UTMetaData@11c2113f}
INFO 13:10:19 Writing Memtable-schema_keyspaces@873579796(0.143KiB serialized bytes, 3 ops, 0%/0% of on/off-heap limit)
INFO 13:10:19 Writing Memtable-schema_columnfamilies@77400274(5.873KiB serialized bytes, 92 ops, 0%/0% of on/off-heap limit)
INFO 13:10:19 Writing Memtable-schema_columns@535165102(3.936KiB serialized bytes, 84 ops, 0%/0% of on/off-heap limit)
INFO 13:10:19 Loading org.apache.cassandra.config.CFMetaData@2d39cd1[cfId=3afbe79f-2194-31a7-add7-f5ab90d8ec9c,ksName=system_auth,cfName=role_permissions,cfType=Standard,comparator=org.apache.cassandra.db.marshal.CompositeType(org.apache.cassandra.db.marshal.UTF8Type,org.apache.cassandra.db.marshal.UTF8Type,org.apache.cassandra.db.marshal.ColumnToCollectionType(7065726d697373696f6e73:org.apache.cassandra.db.marshal.SetType(org.apache.cassandra.db.marshal.UTF8Type))),comment=permissions granted to db roles,readRepairChance=0.0,dcLocalReadRepairChance=0.0,gcGraceSeconds=7776000,defaultValidator=org.apache.cassandra.db.marshal.BytesType,keyValidator=org.apache.cassandra.db.marshal.UTF8Type,minCompactionThreshold=4,maxCompactionThreshold=32,columnMetadata=[ColumnDefinition{name=resource, type=org.apache.cassandra.db.marshal.UTF8Type, kind=CLUSTERING_COLUMN, componentIndex=0, indexName=null, indexType=null}, ColumnDefinition{name=role, type=org.apache.cassandra.db.marshal.UTF8Type, kind=PARTITION_KEY, componentIndex=null, indexName=null, indexType=null}, ColumnDefinition{name=permissions, type=org.apache.cassandra.db.marshal.SetType(org.apache.cassandra.db.marshal.UTF8Type), kind=REGULAR, componentIndex=1, indexName=null, indexType=null}],compactionStrategyClass=class org.apache.cassandra.db.compaction.SizeTieredCompactionStrategy,compactionStrategyOptions={},compressionParameters={sstable_compression=org.apache.cassandra.io.compress.LZ4Compressor},bloomFilterFpChance=0.01,memtableFlushPeriod=3600000,caching={"keys":"ALL", "rows_per_partition":"NONE"},defaultTimeToLive=0,minIndexInterval=128,maxIndexInterval=2048,speculativeRetry=99.0PERCENTILE,droppedColumns={},triggers=[],isDense=false]
INFO 13:10:19 Initializing system_auth.role_permissions
INFO 13:10:19 Loading org.apache.cassandra.config.CFMetaData@7c4ca95e[cfId=5f2fbdad-91f1-3946-bd25-d5da3a5c35ec,ksName=system_auth,cfName=resource_role_permissons_index,cfType=Standard,comparator=org.apache.cassandra.db.marshal.CompositeType(org.apache.cassandra.db.marshal.UTF8Type,org.apache.cassandra.db.marshal.UTF8Type),comment=index of db roles with permissions granted on a resource,readRepairChance=0.0,dcLocalReadRepairChance=0.0,gcGraceSeconds=7776000,defaultValidator=org.apache.cassandra.db.marshal.BytesType,keyValidator=org.apache.cassandra.db.marshal.UTF8Type,minCompactionThreshold=4,maxCompactionThreshold=32,columnMetadata=[ColumnDefinition{name=resource, type=org.apache.cassandra.db.marshal.UTF8Type, kind=PARTITION_KEY, componentIndex=null, indexName=null, indexType=null}, ColumnDefinition{name=role, type=org.apache.cassandra.db.marshal.UTF8Type, kind=CLUSTERING_COLUMN, componentIndex=0, indexName=null, indexType=null}],compactionStrategyClass=class org.apache.cassandra.db.compaction.SizeTieredCompactionStrategy,compactionStrategyOptions={},compressionParameters={sstable_compression=org.apache.cassandra.io.compress.LZ4Compressor},bloomFilterFpChance=0.01,memtableFlushPeriod=3600000,caching={"keys":"ALL", "rows_per_partition":"NONE"},defaultTimeToLive=0,minIndexInterval=128,maxIndexInterval=2048,speculativeRetry=99.0PERCENTILE,droppedColumns={},triggers=[],isDense=false]
INFO 13:10:19 Initializing system_auth.resource_role_permissons_index
INFO 13:10:19 Loading org.apache.cassandra.config.CFMetaData@5b017be3[cfId=5bc52802-de25-35ed-aeab-188eecebb090,ksName=system_auth,cfName=roles,cfType=Standard,comparator=org.apache.cassandra.db.marshal.CompositeType(org.apache.cassandra.db.marshal.UTF8Type,org.apache.cassandra.db.marshal.ColumnToCollectionType(6d656d6265725f6f66:org.apache.cassandra.db.marshal.SetType(org.apache.cassandra.db.marshal.UTF8Type))),comment=role definitions,readRepairChance=0.0,dcLocalReadRepairChance=0.0,gcGraceSeconds=7776000,defaultValidator=org.apache.cassandra.db.marshal.BytesType,keyValidator=org.apache.cassandra.db.marshal.UTF8Type,minCompactionThreshold=4,maxCompactionThreshold=32,columnMetadata=[ColumnDefinition{name=role, type=org.apache.cassandra.db.marshal.UTF8Type, kind=PARTITION_KEY, componentIndex=null, indexName=null, indexType=null}, ColumnDefinition{name=member_of, type=org.apache.cassandra.db.marshal.SetType(org.apache.cassandra.db.marshal.UTF8Type), kind=REGULAR, componentIndex=0, indexName=null, indexType=null}, ColumnDefinition{name=salted_hash, type=org.apache.cassandra.db.marshal.UTF8Type, kind=REGULAR, componentIndex=0, indexName=null, indexType=null}, ColumnDefinition{name=can_login, type=org.apache.cassandra.db.marshal.BooleanType, kind=REGULAR, componentIndex=0, indexName=null, indexType=null}, ColumnDefinition{name=is_superuser, type=org.apache.cassandra.db.marshal.BooleanType, kind=REGULAR, componentIndex=0, indexName=null, indexType=null}],compactionStrategyClass=class org.apache.cassandra.db.compaction.SizeTieredCompactionStrategy,compactionStrategyOptions={},compressionParameters={sstable_compression=org.apache.cassandra.io.compress.LZ4Compressor},bloomFilterFpChance=0.01,memtableFlushPeriod=3600000,caching={"keys":"ALL", "rows_per_partition":"NONE"},defaultTimeToLive=0,minIndexInterval=128,maxIndexInterval=2048,speculativeRetry=99.0PERCENTILE,droppedColumns={},triggers=[],isDense=false]
INFO 13:10:19 Initializing system_auth.roles
INFO 13:10:19 Loading org.apache.cassandra.config.CFMetaData@4aa13f0a[cfId=0ecdaa87-f8fb-3e60-88d1-74fb36fe5c0d,ksName=system_auth,cfName=role_members,cfType=Standard,comparator=org.apache.cassandra.db.marshal.CompositeType(org.apache.cassandra.db.marshal.UTF8Type,org.apache.cassandra.db.marshal.UTF8Type),comment=role memberships lookup table,readRepairChance=0.0,dcLocalReadRepairChance=0.0,gcGraceSeconds=7776000,defaultValidator=org.apache.cassandra.db.marshal.BytesType,keyValidator=org.apache.cassandra.db.marshal.UTF8Type,minCompactionThreshold=4,maxCompactionThreshold=32,columnMetadata=[ColumnDefinition{name=role, type=org.apache.cassandra.db.marshal.UTF8Type, kind=PARTITION_KEY, componentIndex=null, indexName=null, indexType=null}, ColumnDefinition{name=member, type=org.apache.cassandra.db.marshal.UTF8Type, kind=CLUSTERING_COLUMN, componentIndex=0, indexName=null, indexType=null}],compactionStrategyClass=class org.apache.cassandra.db.compaction.SizeTieredCompactionStrategy,compactionStrategyOptions={},compressionParameters={sstable_compression=org.apache.cassandra.io.compress.LZ4Compressor},bloomFilterFpChance=0.01,memtableFlushPeriod=3600000,caching={"keys":"ALL", "rows_per_partition":"NONE"},defaultTimeToLive=0,minIndexInterval=128,maxIndexInterval=2048,speculativeRetry=99.0PERCENTILE,droppedColumns={},triggers=[],isDense=false]
INFO 13:10:19 Initializing system_auth.role_members3）执行 ./cqlsh localhost命令验证是否安装成功：
➜ bin ./cqlsh localhost
Connected to Test Cluster at localhost:9042.
[cqlsh 5.0.1 | Cassandra 2.2.8 | CQL spec 3.3.1 | Native protocol v4]
Use HELP for help.
cqlsh> SELECT cluster_name, listen_address FROM system.local;
cluster_name | listen_address
--------------+----------------
Test Cluster | 127.0.0.1
(1 rows)
cqlsh>四、Java API
1) 创建 keyspace
CREATE KEYSPACE demodb WITH REPLICATION = {'class' : 'SimpleStrategy','replication_factor': 3};2) 创建 table
CREATE TABLE users (
user_name varchar,
password varchar,
gender varchar,
PRIMARY KEY (user_name));利用下面地址查看cassandra实际存储模型：http://www.sestevez.com/sestevez/CassandraDataModeler/
3) 插入数据
INSERT INTO users (user_name, password, gender) VALUES ('zhengyong', '1234', 'male');4) Java查询
参考：https://github.com/datastax/java-driver
手册：http://docs.datastax.com/en/developer/java-driver/3.1/manual/
maven依赖
<dependency>
<groupId>com.datastax.cassandragroupId>
<artifactId>cassandra-driver-coreartifactId>
<version>3.1.0version>
dependency>
<dependency>
<groupId>net.jpountz.lz4groupId>
<artifactId>lz4artifactId>
<version>1.2.0version>
dependency>cassandra客户端package cassandra;
package cassandra;
import com.datastax.driver.core.BoundStatement;
import com.datastax.driver.core.Cluster;
import com.datastax.driver.core.HostDistance;
import com.datastax.driver.core.PoolingOptions;
import com.datastax.driver.core.PreparedStatement;
import com.datastax.driver.core.ProtocolOptions;
import com.datastax.driver.core.ResultSet;
import com.datastax.driver.core.Session;
import com.datastax.driver.core.SocketOptions;
import com.datastax.driver.core.policies.DCAwareRoundRobinPolicy;
import com.datastax.driver.core.policies.DefaultRetryPolicy;
import com.google.common.base.Preconditions;
import java.util.List;
/**
* cassandra客户端
*
* http://docs.datastax.com/en/developer/java-driver/3.1/manual/
*
* Created by zhengyong on 16/12/12.
*/
public class CassandraClient {
/**
* cluster
*/
private static Cluster cluster;
/**
* session
*/
private static Session session;
/**
* table name
*/
private String keyspace;
/**
* server ip
*/
private String serverIp;
public CassandraClient(){
}
public CassandraClient(String keyspace, String serverIp){
this.keyspace = keyspace;
this.serverIp = serverIp;
createClient();
}
/**
* 创建cassandra客户端
*/
public void createClient() {
Preconditions.checkNotNull(keyspace, "keyspace must not be null.");
Preconditions.checkNotNull(serverIp, "serverIp must not be null.");
Cluster.Builder builder = Cluster.builder().addContactPoint(serverIp);
// 设置连接池
PoolingOptions poolingOptions = getPoolingOptions();
builder.withPoolingOptions(poolingOptions);
// socket 链接配置
SocketOptions socketOptions = new SocketOptions().setKeepAlive(true).setReceiveBufferSize(1024
* 1024).setSendBufferSize(1024
* 1024).setConnectTimeoutMillis(5
* 1000).setReadTimeoutMillis(1000);
builder.withSocketOptions(socketOptions);
// 设置压缩方式
builder.withCompression(ProtocolOptions.Compression.LZ4);
// 负载策略
DCAwareRoundRobinPolicy dCAwareRoundRobinPolicy = DCAwareRoundRobinPolicy.builder().withLocalDc("myLocalDC").withUsedHostsPerRemoteDc(2).allowRemoteDCsForLocalConsistencyLevel().build();
builder.withLoadBalancingPolicy(dCAwareRoundRobinPolicy);
// 重试策略
builder.withRetryPolicy(DefaultRetryPolicy.INSTANCE);
cluster = builder.build();
session = cluster.connect(keyspace); // (2)
Preconditions.checkNotNull(session, "session must not be null.");
}
/**
* 构建连接池
*
* @return 连接池
*/
private PoolingOptions getPoolingOptions() {
PoolingOptions poolingOptions = new PoolingOptions().setCoreConnectionsPerHost(HostDistance.LOCAL,
4).setMaxConnectionsPerHost(HostDistance.LOCAL,
10).setCoreConnectionsPerHost(HostDistance.REMOTE,
2).setMaxConnectionsPerHost(HostDistance.REMOTE,
20);
return poolingOptions;
}
/**
* 执行预处理sql
*
* @param sql 数据库语句
* @param params 占位符值
* @return 执行结果
*/
public ResultSet executePreparedSQL(String sql, List params) {
Preconditions.checkNotNull(session, "session must not be null.");
Preconditions.checkNotNull(sql, "sql must not be null.");
Preconditions.checkNotNull(params, "params must not be null.");
PreparedStatement prepared = session.prepare(sql);
BoundStatement bound = prepared.bind(params.toArray());
return session.execute(bound);
}
/**
* 执行sql语句
*
* @param sql 数据库语句
* @return 执行结果
*/
public ResultSet executeSQL(String sql) {
Preconditions.checkNotNull(session, "session must not be null.");
Preconditions.checkNotNull(sql, "sql must not be null.");
return session.execute(sql);
}
public void close() {
if (session != null) {
session.close();
}
if (null != cluster) {
cluster.close();
}
}
public String getKeyspace() {
return keyspace;
}
public void setKeyspace(String keyspace) {
this.keyspace = keyspace;
}
public String getServerIp() {
return serverIp;
}
public void setServerIp(String serverIp) {
this.serverIp = serverIp;
}
} 运行main函数：
package cassandra;
import com.datastax.driver.core.ResultSet;
import com.datastax.driver.core.Row;
import com.google.common.collect.Lists;
import java.util.List;
/**
* Created by zhengyong on 16/12/12.
*/
public class CassandraTest {
public static void main(String[] args) {
// 创建客户端
CassandraClient cassandraClient = new CassandraClient("demodb", "127.0.0.1");
// 插入数据
cassandraClient.executeSQL("INSERT INTO users (user_name, password, gender) VALUES ('zhangsan', 'admin', 'male')");
List params = Lists.newArrayList("root", "root", "male");
cassandraClient.executePreparedSQL("INSERT INTO users (user_name, password, gender) VALUES (?, ?, ?)", params);
// 查询数据
ResultSet rs = cassandraClient.executeSQL("select * from users where user_name = 'root'");
// 输出
Row row = rs.one();
System.out.println("row=" + row.toString());
System.out.println("user_name=" + row.getString("user_name"));
System.out.println("password=" + row.getString("password"));
System.out.println("gender=" + row.getString("gender"));
// 关闭
cassandraClient.close();
}
}
运行结果：
2016-12-12 23:43:21,812 - com.datastax.driver.core.ClockFactory -0 [main] INFO - Using native clock to generate timestamps.
2016-12-12 23:43:22,212 - com.datastax.driver.core.NettyUtil -400 [main] INFO - Did not find Netty's native epoll transport in the classpath, defaulting to NIO.
2016-12-12 23:43:23,678 - com.datastax.driver.core.policies.DCAwareRoundRobinPolicy -1866 [main] INFO - Using data-center name 'datacenter1' for DCAwareRoundRobinPolicy (if this is incorrect, please provide the correct datacenter name with DCAwareRoundRobinPolicy constructor)
2016-12-12 23:43:23,683 - com.datastax.driver.core.Cluster -1871 [main] INFO - New Cassandra host /127.0.0.1:9042 added
row=Row[root, root, male]
user_name=root
password=root
gender=male通过客户端查看刚刚插入数据：
cqlsh> use demodb;
cqlsh:demodb> select * from users ;
user_name | gender | password
-----------+--------+----------
zhangsan | male | admin
zhengyong | male | 1234
root | male | root
zhangsan2 | male | admin
lisi | male | admin
zhangsan1 | male | admin
(6 rows)