Impala找不到com.mysql.jdbc.Driver

Question

我正在尝试使用Red Hat 5上的伪分布式模式在CDH4上设置Cloudera Impala.我有Hive使用JDBC连接到MySQL Metastore,但是我在使用JDBC设置Impala时遇到了麻烦.我一直在按照此处的说明操作:http://www.cloudera.com/content/cloudera-content/cloudera-docs/Impala/latest/Installing-and-Using-Impala/ciiu_impala_jdbc.html

我已经将JAR解压缩到一个目录并包含该目录$CLASSPATH.我也包括/usr/lib/hive/lib在$CLASSPATH里面了mysql-connector-java-5.1.25-bin.jar.

在我的Hive和Impala conf目录中,我hive-site.xml包含以下属性:

<property>
    <name>javax.jdo.option.ConnectionURL</name>
    <value>jdbc:mysql://localhost/metastore</value>
</property>

<property>
    <name>javax.jdo.option.ConnectionDriverName</name>
    <value>com.mysql.jdbc.Driver</value>
</property>

<property>
    <name>javax.jdo.option.ConnectionUserName</name>
    <value>hiveuser</value>
</property>

<property>
    <name>javax.jdo.option.ConnectionPassword</name>
    <value>password</value>
</property>

<property>
    <name>datanucleus.autoCreateSchema</name>
    <value>false</value>
</property>

<property>
    <name>datanucleus.fixedDatastore</name>
    <value>true</value>
</property>

但是当我运行时sudo service impala-server restart,服务器日志有这个错误:

ERROR common.MetaStoreClientPool: Error initializing Hive Meta Store client
javax.jdo.JDOFatalInternalException: Error creating transactional connection factory

它说的原因是:

Caused by: org.datanucleus.store.rdbms.datasource.DatastoreDriverNotFoundException: The specified datastore driver ("com.mysql.jdbc.Driver") was not found in the CLASSPATH. Please check your CLASSPATH specification, and the name of the driver.
    at org.datanucleus.store.rdbms.datasource.dbcp.DBCPDataSourceFactory.makePooledDataSource(DBCPDataSourceFactory.java:80)
    at org.datanucleus.store.rdbms.ConnectionFactoryImpl.initDataSourceTx(ConnectionFactoryImpl.java:144)
    ... 57 more

我是否缺少使用JDBC配置Impala的步骤？

Answer 1

我通过复制mysql-connector-java-5.1.25-bin.jar来解决这个问题/var/lib/impala- 启动脚本由于某种原因告诉类路径在这里寻找连接器jar.