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https://issues.apache.org/jira/browse/HIVE-1539?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12905455#action_12905455
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Bennie Schut commented on HIVE-1539:
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JDOClassLoaderResolver doesn't seem thread safe. That's a bit of a surprise. I
filed a bug with datanucleus:
http://www.datanucleus.org/servlet/jira/browse/NUCCORE-559
I just made my own threadsafe version of the JDOClassLoaderResolver and am
loading it to see if that fixes it. Will probably take a few days to be sure it
got fixed.
> Concurrent metastore threading problem
> ---------------------------------------
>
> Key: HIVE-1539
> URL: https://issues.apache.org/jira/browse/HIVE-1539
> Project: Hadoop Hive
> Issue Type: Bug
> Components: Metastore
> Affects Versions: 0.7.0
> Reporter: Bennie Schut
> Assignee: Bennie Schut
> Attachments: thread_dump_hanging.txt
>
>
> When running hive as a service and running a high number of queries
> concurrently I end up with multiple threads running at 100% cpu without any
> progress.
> Looking at these threads I notice this thread(484e):
> at
> org.apache.hadoop.hive.metastore.ObjectStore.getMTable(ObjectStore.java:598)
> But on a different thread(63a2):
> at
> org.apache.hadoop.hive.metastore.model.MStorageDescriptor.jdoReplaceField(MStorageDescriptor.java)
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