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https://issues.apache.org/jira/browse/HIVE-3469?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13456357#comment-13456357
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rohithsharma commented on HIVE-3469:
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Any exception in above 1 or 3, Hive client hangs forever.
If we synchronize Metastore.createDefaultDB_core(), all the 3 problem can be
resolved. Please suggest your opinion..
> When new hive cluster is started, hive jdbc client hangs.
> ---------------------------------------------------------
>
> Key: HIVE-3469
> URL: https://issues.apache.org/jira/browse/HIVE-3469
> Project: Hive
> Issue Type: Bug
> Components: Clients, Metastore, Thrift API
> Environment: Hadoop-2.0.1 + Hive-0.9.0
> Reporter: rohithsharma
>
> The scenario is as follows :
> For the new hive cluster , when multiple hive client is getting the
> connection for hive server , there are 3 problems in metastore , hive client.
> 1. Since the derby is booted at first connection, multiple client try to
> create database.One of the client succeed and another one throw exception
> because of *unique primary constraint* in metatables.
> 2. Once the Runtime exception is throw, the hive client which is made
> connection request will hang forever.
> 3. Potentially "ConcurrentModificationException" is thrown by JDOQuery.
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