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Posted to issues@tez.apache.org by "Rajesh Balamohan (JIRA)" <ji...@apache.org> on 2014/09/03 02:21:53 UTC

[jira] [Commented] (TEZ-1515) DAGAppMaster : Thread contentions due to org.apache.tez.common.counters.ResourceBundles

    [ https://issues.apache.org/jira/browse/TEZ-1515?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=14119040#comment-14119040 ] 

Rajesh Balamohan commented on TEZ-1515:
---------------------------------------

Yes [~sseth].  Added this to branch-0.5 just now.

> DAGAppMaster : Thread contentions due to org.apache.tez.common.counters.ResourceBundles
> ---------------------------------------------------------------------------------------
>
>                 Key: TEZ-1515
>                 URL: https://issues.apache.org/jira/browse/TEZ-1515
>             Project: Apache Tez
>          Issue Type: Bug
>            Reporter: Rajesh Balamohan
>            Assignee: Rajesh Balamohan
>              Labels: performance
>             Fix For: 0.6.0
>
>         Attachments: DAGAppMaster_AsyncDispatcher.png, HistoryLoggingService.png, RecoveryService.png, TEZ-1515.1.patch, TEZ-1515.2.patch, detailed_sample_stack_trace.txt
>
>
> Thread profiling DagAppMaster for a synthetic tez test revealed lots of contentions in RecoveryService / HistoryEventHandlingThread / AsyncDispatcher threads.  All of these try to access tez counters and are blocked on "public static synchronized <T> T getValue(String bundleName, String key,String suffix, T defaultValue)".
> I will attach the thread profiler snapshots soon.



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