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From "Paul Yang (JIRA)" <j...@apache.org>
Subject [jira] Commented: (HIVE-1539) Concurrent metastore threading problem
Date Mon, 16 Aug 2010 22:48:18 GMT

    [ https://issues.apache.org/jira/browse/HIVE-1539?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12899157#action_12899157
] 

Paul Yang commented on HIVE-1539:
---------------------------------

>From looking at the Hive class, we are creating a ThreadLocal instance of Hive when we
call get(). Since the HiveMetaStoreClient is a member of Hive, shouldn't the client be accessed
by only 1 thread at a time?

> 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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