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From "Bennie Schut (JIRA)" <>
Subject [jira] Commented: (HIVE-1539) Concurrent metastore threading problem
Date Thu, 02 Sep 2010 08:59:55 GMT


Bennie Schut commented on HIVE-1539:

JDOClassLoaderResolver doesn't seem thread safe. That's a bit of a surprise. I filed a bug
with datanucleus:
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:
>             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(
> But on a different thread(63a2):
> at org.apache.hadoop.hive.metastore.model.MStorageDescriptor.jdoReplaceField(

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