最近練習Hive，安裝時爆出如下錯誤：Unable to instantiate org.apache.hadoop.hive.ql.metadata.SessionHiveMetaStoreClient的錯誤
報錯的日志如下：

Exception in thread "main" java.lang.RuntimeException: java.lang.RuntimeException: Unable to instantiate org.apache.hadoop.hive.ql.metadata.SessionHiveMetaStoreClientat org.apache.hadoop.hive.ql.session.SessionState.start(SessionState.java:522)at org.apache.hadoop.hive.cli.CliDriver.run(CliDriver.java:677)at org.apache.hadoop.hive.cli.CliDriver.main(CliDriver.java:621)at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:57)at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)at java.lang.reflect.Method.invoke(Method.java:606)at org.apache.hadoop.util.RunJar.run(RunJar.java:221)at org.apache.hadoop.util.RunJar.main(RunJar.java:136) Caused by: java.lang.RuntimeException: Unable to instantiate org.apache.hadoop.hive.ql.metadata.SessionHiveMetaStoreClientat org.apache.hadoop.hive.metastore.MetaStoreUtils.newInstance(MetaStoreUtils.java:1523)at org.apache.hadoop.hive.metastore.RetryingMetaStoreClient.<init>(RetryingMetaStoreClient.java:86)at org.apache.hadoop.hive.metastore.RetryingMetaStoreClient.getProxy(RetryingMetaStoreClient.java:132)at org.apache.hadoop.hive.metastore.RetryingMetaStoreClient.getProxy(RetryingMetaStoreClient.java:104)at org.apache.hadoop.hive.ql.metadata.Hive.createMetaStoreClient(Hive.java:3005)at org.apache.hadoop.hive.ql.metadata.Hive.getMSC(Hive.java:3024)at org.apache.hadoop.hive.ql.session.SessionState.start(SessionState.java:503)... 8 more Caused by: java.lang.reflect.InvocationTargetExceptionat sun.reflect.NativeConstructorAccessorImpl.newInstance0(Native Method)at sun.reflect.NativeConstructorAccessorImpl.newInstance(NativeConstructorAccessorImpl.java:57)at sun.reflect.DelegatingConstructorAccessorImpl.newInstance(DelegatingConstructorAccessorImpl.java:45)at java.lang.reflect.Constructor.newInstance(Constructor.java:526)at org.apache.hadoop.hive.metastore.MetaStoreUtils.newInstance(MetaStoreUtils.java:1521)... 14 more Caused by: javax.jdo.JDOFatalInternalException: Error creating transactional connection factory NestedThrowables: java.lang.reflect.InvocationTargetExceptionat org.datanucleus.api.jdo.NucleusJDOHelper.getJDOExceptionForNucleusException(NucleusJDOHelper.java:587)at org.datanucleus.api.jdo.JDOPersistenceManagerFactory.freezeConfiguration(JDOPersistenceManagerFactory.java:788)at org.datanucleus.api.jdo.JDOPersistenceManagerFactory.createPersistenceManagerFactory(JDOPersistenceManagerFactory.java:333)at org.datanucleus.api.jdo.JDOPersistenceManagerFactory.getPersistenceManagerFactory(JDOPersistenceManagerFactory.java:202)at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:57)at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)at java.lang.reflect.Method.invoke(Method.java:606)at javax.jdo.JDOHelper$16.run(JDOHelper.java:1965)at java.security.AccessController.doPrivileged(Native Method)at javax.jdo.JDOHelper.invoke(JDOHelper.java:1960)at javax.jdo.JDOHelper.invokeGetPersistenceManagerFactoryOnImplementation(JDOHelper.java:1166)at javax.jdo.JDOHelper.getPersistenceManagerFactory(JDOHelper.java:808)at javax.jdo.JDOHelper.getPersistenceManagerFactory(JDOHelper.java:701)at org.apache.hadoop.hive.metastore.ObjectStore.getPMF(ObjectStore.java:365)at org.apache.hadoop.hive.metastore.ObjectStore.getPersistenceManager(ObjectStore.java:394)at org.apache.hadoop.hive.metastore.ObjectStore.initialize(ObjectStore.java:291)at org.apache.hadoop.hive.metastore.ObjectStore.setConf(ObjectStore.java:258)at org.apache.hadoop.util.ReflectionUtils.setConf(ReflectionUtils.java:73)at org.apache.hadoop.util.ReflectionUtils.newInstance(ReflectionUtils.java:133)at org.apache.hadoop.hive.metastore.RawStoreProxy.<init>(RawStoreProxy.java:57)at org.apache.hadoop.hive.metastore.RawStoreProxy.getProxy(RawStoreProxy.java:66)at org.apache.hadoop.hive.metastore.HiveMetaStore$HMSHandler.newRawStore(HiveMetaStore.java:593)at org.apache.hadoop.hive.metastore.HiveMetaStore$HMSHandler.getMS(HiveMetaStore.java:571)at org.apache.hadoop.hive.metastore.HiveMetaStore$HMSHandler.createDefaultDB(HiveMetaStore.java:624)at org.apache.hadoop.hive.metastore.HiveMetaStore$HMSHandler.init(HiveMetaStore.java:461)at org.apache.hadoop.hive.metastore.RetryingHMSHandler.<init>(RetryingHMSHandler.java:66)at org.apache.hadoop.hive.metastore.RetryingHMSHandler.getProxy(RetryingHMSHandler.java:72)at org.apache.hadoop.hive.metastore.HiveMetaStore.newRetryingHMSHandler(HiveMetaStore.java:5762)at org.apache.hadoop.hive.metastore.HiveMetaStoreClient.<init>(HiveMetaStoreClient.java:199)at org.apache.hadoop.hive.ql.metadata.SessionHiveMetaStoreClient.<init>(SessionHiveMetaStoreClient.java:74)... 19 more Caused by: java.lang.reflect.InvocationTargetExceptionat sun.reflect.NativeConstructorAccessorImpl.newInstance0(Native Method)at sun.reflect.NativeConstructorAccessorImpl.newInstance(NativeConstructorAccessorImpl.java:57)at sun.reflect.DelegatingConstructorAccessorImpl.newInstance(DelegatingConstructorAccessorImpl.java:45)at java.lang.reflect.Constructor.newInstance(Constructor.java:526)at org.datanucleus.plugin.NonManagedPluginRegistry.createExecutableExtension(NonManagedPluginRegistry.java:631)at org.datanucleus.plugin.PluginManager.createExecutableExtension(PluginManager.java:325)at org.datanucleus.store.AbstractStoreManager.registerConnectionFactory(AbstractStoreManager.java:282)at org.datanucleus.store.AbstractStoreManager.<init>(AbstractStoreManager.java:240)at org.datanucleus.store.rdbms.RDBMSStoreManager.<init>(RDBMSStoreManager.java:286)at sun.reflect.NativeConstructorAccessorImpl.newInstance0(Native Method)at sun.reflect.NativeConstructorAccessorImpl.newInstance(NativeConstructorAccessorImpl.java:57)at sun.reflect.DelegatingConstructorAccessorImpl.newInstance(DelegatingConstructorAccessorImpl.java:45)at java.lang.reflect.Constructor.newInstance(Constructor.java:526)at org.datanucleus.plugin.NonManagedPluginRegistry.createExecutableExtension(NonManagedPluginRegistry.java:631)at org.datanucleus.plugin.PluginManager.createExecutableExtension(PluginManager.java:301)at org.datanucleus.NucleusContext.createStoreManagerForProperties(NucleusContext.java:1187)at org.datanucleus.NucleusContext.initialise(NucleusContext.java:356)at org.datanucleus.api.jdo.JDOPersistenceManagerFactory.freezeConfiguration(JDOPersistenceManagerFactory.java:775)... 48 more Caused by: org.datanucleus.exceptions.NucleusException: Attempt to invoke the "BONECP" plugin to create a ConnectionPool gave an error : 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.ConnectionFactoryImpl.generateDataSources(ConnectionFactoryImpl.java:259)at org.datanucleus.store.rdbms.ConnectionFactoryImpl.initialiseDataSources(ConnectionFactoryImpl.java:131)at org.datanucleus.store.rdbms.ConnectionFactoryImpl.<init>(ConnectionFactoryImpl.java:85)... 66 more 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)... 68 more

經過大半天的折騰，總算解決了這個問題。
這里總結下幾種可能解決辦法：
1、Hive版本過高。第一次安裝我用的是Hive的1.2.1版本，mysql是5.6.33，hadoop是2.6版本。但是安裝之后按照相關步驟進行操作卻報如上錯誤。后來經過不斷的查資料發現有網友說有可能是Hive版本太高，所以下載了0.9版本（下載地址：http://download.csdn.net/download/qq_16633405/10028786）又按照之前的步驟來了一遍就OK了。
2、參考網上

[root@slave bin]# ./hive --service metastore & [2] 5194 [root@slave bin]# Starting Hive Metastore Server 17/02/20 19:46:16 WARN conf.HiveConf: HiveConf of name hive.metastore.local does not exist [root@slave bin]# ./hive 17/02/20 19:46:45 WARN conf.HiveConf: HiveConf of name hive.metastore.local does not exist Logging initialized using configuration in file:/home/hadoop/hive-1.2.1/conf/hive-log4j.properties hive> show databases; OK default h_test Time taken: 1.767 seconds, Fetched: 2 row(s) hive> use h_test; OK Time taken: 0.283 seconds

試過之后并沒有效果。
3、可能相關的配置文件配置錯誤。
對于相關配置文件的配置過程請參考：http://blog.csdn.net/qq_16633405/article/details/78278979

總結

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