Exception in thread "main" java.lang.RuntimeException: java.lang.RuntimeException: Unable to instantiate org.apache.hadoop.hive.metastore.HiveMetaStoreClient

hive安装时遇到的问题

解压后指定了hive-env.sh文件的Hadoop_home  & hive_conf 两个参数后，先直接bin/hive 用Derby数据库启动一下，然后再配置其他的数据源

下面的异常时没有安装mysql的驱动，异常提示在最后一行cause by 里面才显示，所以注意看自己的驱动是否添加

[fan@master hive-0.13.1-cdh5.3.6]$ bin/hive

Logging initialized using configuration in jar:file:/opt/modules/hive-0.13.1-cdh5.3.6/lib/hive-common-0.13.1-cdh5.3.6.jar!/hive-log4j.properties
Exception in thread "main" java.lang.RuntimeException: java.lang.RuntimeException: Unable to instantiate org.apache.hadoop.hive.metastore.HiveMetaStoreClient
at org.apache.hadoop.hive.ql.session.SessionState.start(SessionState.java:371)
at org.apache.hadoop.hive.cli.CliDriver.run(CliDriver.java:689)
at org.apache.hadoop.hive.cli.CliDriver.main(CliDriver.java:633)
at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:62)
at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
at java.lang.reflect.Method.invoke(Method.java:498)
at org.apache.hadoop.util.RunJar.main(RunJar.java:212)
Caused by: java.lang.RuntimeException: Unable to instantiate org.apache.hadoop.hive.metastore.HiveMetaStoreClient
at org.apache.hadoop.hive.metastore.MetaStoreUtils.newInstance(MetaStoreUtils.java:1426)
at org.apache.hadoop.hive.metastore.RetryingMetaStoreClient.<init>(RetryingMetaStoreClient.java:63)
at org.apache.hadoop.hive.metastore.RetryingMetaStoreClient.getProxy(RetryingMetaStoreClient.java:73)
at org.apache.hadoop.hive.ql.metadata.Hive.createMetaStoreClient(Hive.java:2625)
at org.apache.hadoop.hive.ql.metadata.Hive.getMSC(Hive.java:2644)
at org.apache.hadoop.hive.ql.session.SessionState.start(SessionState.java:365)

。。。。

Caused by: org.datanucleus.store.rdbms.connectionpool.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.connectionpool.AbstractConnectionPoolFactory.loadDriver(AbstractConnectionPoolFactory.java:58)
at org.datanucleus.store.rdbms.connectionpool.BoneCPConnectionPoolFactory.createConnectionPool(BoneCPConnectionPoolFactory.java:54)
at org.datanucleus.store.rdbms.ConnectionFactoryImpl.generateDataSources(ConnectionFactoryImpl.java:238)

解决办法：

下载mysql的驱动包到hive_home/lib目录下