通过phoenix在hbase上创建二级索引，Secondary Indexing
环境描述：
- 操作系统版本：CentOS release 6.5 (Final)
- 内核版本：2.6.32-431.el6.x86_64
- phoenix版本：phoenix-4.10.0
- hbase版本：hbase-1.2.6
- hbase节点分布：1个HMaster，2个RegionServer
文档目的：
通过在phoenix客户端连接hbase数据库，在phoenix中创建二级索引。
配置过程：
1.登录到RegionSever节点，修改hbase-site.xml配置文件，加入如下配置
<property>
<name>phoenix.query.maxServerCacheBytes</name>
<value>2097152000</value>
</property>
<property>
<name>hbase.regionserver.wal.codec</name>
<value>org.apache.hadoop.hbase.regionserver.wal.IndexedWALEditCodec</value>
</property>
<property>
<name>hbase.region.server.rpc.scheduler.factory.class</name>
<value>org.apache.hadoop.hbase.ipc.PhoenixRpcSchedulerFactory</value>
<description>Factory to create the Phoenix RPC Scheduler that uses separate queues for index and metadata updates</description>
</property>
<property>
<name>hbase.rpc.controllerfactory.class</name>
<value>org.apache.hadoop.hbase.ipc.controller.ServerRpcControllerFactory</value>
<description>Factory to create the Phoenix RPC Scheduler that uses separate queues for index and metadata updates</description>
</property>
备注：要在所有的RegionServer节点进行添加，HMaster节点的hbase-site.xml配置文件不需要进行修改。
2.修改之后，重新启动hbase服务
进入hbase-1.2.6目录：
bin/stop-hbase.sh
bin/start-hbase.sh
3.通过jps检查各个hbase节点进程无异常
4.通过phoenix连接hbase,然后创建二级索引
创建表测试表：
CREATE TABLE IF NOT EXISTS WEB_STAT (
HOST CHAR(2) NOT NULL,
DOMAIN VARCHAR NOT NULL,
FEATURE VARCHAR NOT NULL,
DATE DATE NOT NULL,
USAGE.CORE BIGINT,
USAGE.DB BIGINT,
STATS.ACTIVE_VISITOR INTEGER
CONSTRAINT PK PRIMARY KEY (HOST, DOMAIN, FEATURE, DATE)
);
创建二级索引：
CREATE INDEX IDX_01 ON WEB_STAT(HOST);
删除二级索引：
DROP INDEX IDX_01 ON WEB_STAT
备注：如果以上创建索引没有报错，说明以上的基本配置是没有问题的。
如果不配置以上参数，会报下面的错误：
0: jdbc:phoenix:redhat6> create index my_index on example (M.C0);
Error: ERROR 1029 (42Y88): Mutable secondary indexes must have the hbase.regionserver.wal.codec property set to org.apache.hadoop.hbase.regionserver.wal.IndexedWALEditCodec in the hbase-sites.xml of every region server. tableName=MY_INDEX (state=42Y88,code=1029)
java.sql.SQLException: ERROR 1029 (42Y88): Mutable secondary indexes must have the hbase.regionserver.wal.codec property set to org.apache.hadoop.hbase.regionserver.wal.IndexedWALEditCodec in the hbase-sites.xml of every region server. tableName=MY_INDEX
at org.apache.phoenix.exception.SQLExceptionCode$Factory$1.newException(SQLExceptionCode.java:488)
at org.apache.phoenix.exception.SQLExceptionInfo.buildException(SQLExceptionInfo.java:150)
at org.apache.phoenix.schema.MetaDataClient.createIndex(MetaDataClient.java:1456)
at org.apache.phoenix.compile.CreateIndexCompiler$1.execute(CreateIndexCompiler.java:85)
at org.apache.phoenix.jdbc.PhoenixStatement$2.call(PhoenixStatement.java:394)
at org.apache.phoenix.jdbc.PhoenixStatement$2.call(PhoenixStatement.java:377)
at org.apache.phoenix.call.CallRunner.run(CallRunner.java:53)
at org.apache.phoenix.jdbc.PhoenixStatement.executeMutation(PhoenixStatement.java:375)
at org.apache.phoenix.jdbc.PhoenixStatement.executeMutation(PhoenixStatement.java:364)
at org.apache.phoenix.jdbc.PhoenixStatement.execute(PhoenixStatement.java:1738)
at sqlline.Commands.execute(Commands.java:822)
at sqlline.Commands.sql(Commands.java:732)
at sqlline.SqlLine.dispatch(SqlLine.java:813)
at sqlline.SqlLine.begin(SqlLine.java:686)
at sqlline.SqlLine.start(SqlLine.java:398)
at sqlline.SqlLine.main(SqlLine.java:291)
