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