spark MetaException(message:Version information not found in metastore. )

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本文记录了解决Spark结合Hive过程中出现的元数据访问失败的问题。通过调整hive-site.xml配置文件中的hive.metastore.schema.verification参数，从true更改为false，成功解决了启动时的版本一致性校验错误。

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尝试将spark与hive结合起来。将相关配置完毕以后，启动spark-sql的过程中，出现了以下错误：

16/07/25 17:19:08 WARN metadata.Hive: Failed to access metastore. This class should not accessed in runtime.
org.apache.hadoop.hive.ql.metadata.HiveException: java.lang.RuntimeException: Unable to instantiate org.apache.hadoop.hive.ql.metadata.SessionHiveMetaStoreClient
	at org.apache.hadoop.hive.ql.metadata.Hive.getAllDatabases(Hive.java:1236)
	at org.apache.hadoop.hive.ql.metadata.Hive.reloadFunctions(Hive.java:174)
	at org.apache.hadoop.hive.ql.metadata.Hive.<clinit>(Hive.java:166)
	at org.apache.hadoop.hive.ql.session.SessionState.start(SessionState.java:503)
	at org.apache.spark.sql.hive.thriftserver.SparkSQLCLIDriver$.main(SparkSQLCLIDriver.scala:116)
	at org.apache.spark.sql.hive.thriftserver.SparkSQLCLIDriver.main(SparkSQLCLIDriver.scala)
	at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
	at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:57)
	at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
	at java.lang.reflect.Method.invoke(Method.java:606)
	at org.apache.spark.deploy.SparkSubmit$.org$apache$spark$deploy$SparkSubmit$$runMain(SparkSubmit.scala:731)
	at org.apache.spark.deploy.SparkSubmit$.doRunMain$1(SparkSubmit.scala:181)
	at org.apache.spark.deploy.SparkSubmit$.submit(SparkSubmit.scala:206)
	at org.apache.spark.deploy.SparkSubmit$.main(SparkSubmit.scala:121)
	at org.apache.spark.deploy.SparkSubmit.main(SparkSubmit.scala)
Caused by: java.lang.RuntimeException: Unable to instantiate org.apache.hadoop.hive.ql.metadata.SessionHiveMetaStoreClient
	at org.apache.hadoop.hive.metastore.MetaStoreUtils.newInstance(MetaStoreUtils.java:1523)
	at org.apache.hadoop.hive.metastore.RetryingMetaStoreClient.<init>(RetryingMetaStoreClient.java:86)
	at org.apache.hadoop.hive.metastore.RetryingMetaStoreClient.getProxy(RetryingMetaStoreClient.java:132)
	at org.apache.hadoop.hive.metastore.RetryingMetaStoreClient.getProxy(RetryingMetaStoreClient.java:104)
	at org.apache.hadoop.hive.ql.metadata.Hive.createMetaStoreClient(Hive.java:3005)
	at org.apache.hadoop.hive.ql.metadata.Hive.getMSC(Hive.java:3024)
	at org.apache.hadoop.hive.ql.metadata.Hive.getAllDatabases(Hive.java:1234)
	... 14 more
Caused by: java.lang.reflect.InvocationTargetException
	at sun.reflect.NativeConstructorAccessorImpl.newInstance0(Native Method)
	at sun.reflect.NativeConstructorAccessorImpl.newInstance(NativeConstructorAccessorImpl.java:57)
	at sun.reflect.DelegatingConstructorAccessorImpl.newInstance(DelegatingConstructorAccessorImpl.java:45)
	at java.lang.reflect.Constructor.newInstance(Constructor.java:526)
	at org.apache.hadoop.hive.metastore.MetaStoreUtils.newInstance(MetaStoreUtils.java:1521)
	... 20 more
Caused by: MetaException(message:Version information not found in metastore. )
	at org.apache.hadoop.hive.metastore.ObjectStore.checkSchema(ObjectStore.java:6664)
	at org.apache.hadoop.hive.metastore.ObjectStore.verifySchema(ObjectStore.java:6645)
	at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
	at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:57)
	at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
	at java.lang.reflect.Method.invoke(Method.java:606)
	at org.apache.hadoop.hive.metastore.RawStoreProxy.invoke(RawStoreProxy.java:114)
	at com.sun.proxy.$Proxy12.verifySchema(Unknown Source)
	at org.apache.hadoop.hive.metastore.HiveMetaStore$HMSHandler.getMS(HiveMetaStore.java:572)
	at org.apache.hadoop.hive.metastore.HiveMetaStore$HMSHandler.createDefaultDB(HiveMetaStore.java:620)
	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)
	... 25 more

这个问题折磨了本宝宝好久。根据错误信息来看，肯定是hive元数据相关的错误。而hive的元数据是存在mysql里的。到底问题在哪里勒？
网络上找了一大圈，最后定位到了问题：
在hive-site.xml里，有这么一个配置项：

<property>
        <name>hive.metastore.schema.verification</name>
        <value>true</value>
</property>

查了一下这个配置项的意义：
hive.metastore.schema.verification：强制metastore的schema一致性，开启的话会校验在metastore中存储的信息的版本和hive的jar包中的版本一致性，并且关闭自动schema迁移，用户必须手动的升级hive并且迁移schema，关闭的话只会在版本不一致时给出警告，默认是false不开启；

因为此配置项设置成为了true，所以可能存在jar包版本不一致问题。导致无法正常启动！
将value由true改为false以后，顺利启动spark-shell

最后总结一下经验：
越是高层应用，依赖底层与下游的组件就越多，配置项也越多越复杂，出错的概率自然也就大了很多。
遇到错误以后，快速定位问题很重要。一般错误信息的提示都很长，一定注意仔细看最后一个错误信息。因为往往最后一个错误信息是源头，从而导致后续一系列问题。最开始的时候我就是因为没有特别注意到最后一个错误而浪费了一些时间！