hive metastore ha 配置

1.需要在两台或多台机器上启动hive metastore 服务，这台机器上hive配置如下

<property>
<name>javax.jdo.option.ConnectionURL</name>
<value>jdbc:mysql://10.140.60.53:3306/hive?createDatabaseIfNotExist=true</value>
<description>JDBC connect string for a JDBC metastore</description>
</property>

<property>
<name>javax.jdo.option.ConnectionDriverName</name>
<value>com.mysql.jdbc.Driver</value>
<description>Driver class name for a JDBC metastore</description>
</property>

<property>
<name>javax.jdo.option.ConnectionUserName</name>
<value>root</value>
<description>username to use against metastore database</description>
</property>

<property>
<name>javax.jdo.option.ConnectionPassword</name>
<value>123456</value>
<description>password to use against metastore database</description>
</property>

2.启动hive metastore。
hive --serive metastore

3.其他client端配置

<property>
<name>hive.metastore.uris</name>
<value>thrift://test-nn1:9083,thrift://test-nn2:9083</value>
</property>

hive metastore可以配置多个实例，防止单点问题

4.之后，启动hive的时候，本地client端就无需实例化hive的metastore，启动速度会加快

ps：这种方式是官方推荐的方式。