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https://issues.apache.org/jira/browse/HIVE-13836?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15303089#comment-15303089
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Sushanth Sowmyan commented on HIVE-13836:
-----------------------------------------
I will agree. As long as we don't lose the underlying issue(and when you create
a new jira for that, could you link it to this - that way, whoever works on
that has an easy reproduction to work against), I'm okay with adding
synchronization here to DbNotificationListener.
> DbNotifications giving an error = Invalid state. Transaction has already
> started
> --------------------------------------------------------------------------------
>
> Key: HIVE-13836
> URL: https://issues.apache.org/jira/browse/HIVE-13836
> Project: Hive
> Issue Type: Bug
> Reporter: Nachiket Vaidya
> Priority: Critical
> Attachments: HIVE-13836.patch
>
>
> I used pyhs2 python client to create tables/partitions in hive. I was working
> fine until I moved to multithreaded scripts which created 8 connections and
> ran DDL queries concurrently.
> I got the error as
> {noformat}
> 2016-05-04 17:49:26,226 ERROR
> org.apache.hadoop.hive.metastore.RetryingHMSHandler: [pool-4-thread-194]:
> HMSHandler Fatal error: Invalid state. Transaction has already started
> org.datanucleus.transaction.NucleusTransactionException: Invalid state.
> Transaction has already started
> at
> org.datanucleus.transaction.TransactionManager.begin(TransactionManager.java:47)
> at org.datanucleus.TransactionImpl.begin(TransactionImpl.java:131)
> at
> org.datanucleus.api.jdo.JDOTransaction.internalBegin(JDOTransaction.java:88)
> at
> org.datanucleus.api.jdo.JDOTransaction.begin(JDOTransaction.java:80)
> at
> org.apache.hadoop.hive.metastore.ObjectStore.openTransaction(ObjectStore.java:463)
> at
> org.apache.hadoop.hive.metastore.ObjectStore.addNotificationEvent(ObjectStore.java:7522)
> at sun.reflect.GeneratedMethodAccessor20.invoke(Unknown Source)
> 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.$Proxy10.addNotificationEvent(Unknown Source)
> at
> org.apache.hive.hcatalog.listener.DbNotificationListener.enqueue(DbNotificationListener.java:261)
> at
> org.apache.hive.hcatalog.listener.DbNotificationListener.onCreateTable(DbNotificationListener.java:123)
> at
> org.apache.hadoop.hive.metastore.HiveMetaStore$HMSHandler.create_table_core(HiveMetaStore.java:1483)
> at
> org.apache.hadoop.hive.metastore.HiveMetaStore$HMSHandler.create_table_with_environment_context(HiveMetaStore.java:1502)
> at sun.reflect.GeneratedMethodAccessor57.invoke(Unknown Source)
> at
> sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
> at java.lang.reflect.Method.invoke(Method.java:606)
> at
> org.apache.hadoop.hive.metastore.RetryingHMSHandler.invokeInternal(RetryingHMSHandler.java:138)
> at
> org.apache.hadoop.hive.metastore.RetryingHMSHandler.invoke(RetryingHMSHandler.java:99)
> at
> com.sun.proxy.$Proxy14.create_table_with_environment_context(Unknown Source)
> at
> org.apache.hadoop.hive.metastore.api.ThriftHiveMetastore$Processor$create_table_with_environment_context.getResult(ThriftHiveMetastore.java:9267)
> {noformat}
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