我正在尝试在Red Hat 5上以伪分布式模式使用CDH4设置Cloudera Impala。我使用JDBC连接到MySQL Metastore的Hive,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
我已将JAR解压缩到一个目录,并将该目录包含在$CLASSPATH
中。我还在/usr/lib/hive/lib
中添加了$CLASSPATH
,其中包含mysql-connector-java-5.1.25-bin.jar
。
在我的Hive和Impala conf
目录中,我有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sudo service impala-server restart
时,服务器日志出现此错误:
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?
答案 0 :(得分:5)
我通过将mysql-connector-java-5.1.25-bin.jar
复制到/var/lib/impala
来解决此问题 - 启动脚本由于某种原因告诉类路径在这里查找连接器jar。