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Date: Thu, 27 Apr 2017 12:57:04 +0000 (UTC)
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Subject: [jira] [Commented] (YARN-6455) Enhance the timelinewriter.flush()
 race condition fix
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archived-at: Thu, 27 Apr 2017 12:57:10 -0000


    [ https://issues.apache.org/jira/browse/YARN-6455?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15986558#comment-15986558 ] 

Hudson commented on YARN-6455:
------------------------------

SUCCESS: Integrated in Jenkins build Hadoop-trunk-Commit #11639 (See [https://builds.apache.org/job/Hadoop-trunk-Commit/11639/])
YARN-6455. Enhance the timelinewriter.flush() race condition fix (Haibo (varunsaxena: rev 793bbf216dc6d44ea57c778037bd461513fa6078)
* (edit) hadoop-yarn-project/hadoop-yarn/hadoop-yarn-server/hadoop-yarn-server-timelineservice/src/main/java/org/apache/hadoop/yarn/server/timelineservice/collector/TimelineCollector.java
* (edit) hadoop-yarn-project/hadoop-yarn/hadoop-yarn-server/hadoop-yarn-server-timelineservice/src/main/java/org/apache/hadoop/yarn/server/timelineservice/collector/AppLevelTimelineCollector.java


> Enhance the timelinewriter.flush() race condition fix
> -----------------------------------------------------
>
>                 Key: YARN-6455
>                 URL: https://issues.apache.org/jira/browse/YARN-6455
>             Project: Hadoop YARN
>          Issue Type: Sub-task
>          Components: yarn
>    Affects Versions: 3.0.0-alpha2
>            Reporter: Haibo Chen
>            Assignee: Haibo Chen
>             Fix For: YARN-5355, YARN-5355-branch-2, 3.0.0-alpha3
>
>         Attachments: YARN-6455.00.patch
>
>
> YARN-6376 fixes timelinewriter.flush() race condition among concurrent putEntities() calls and periodical flush by TimelineCollectorManager by synchronizing on the writer object. 
> Synchronizing on the writer is still a little brittle there, because there is a getWriter method which lets callers access the writer without synchronizing on it. AppLevelTimelineCollector#AppLevelAggregator#agregate() does this in line 152: getWriter().write(...)  In this case it doesn't flush, but if that were to be added, that would re-introduce the race fixed in YARN-6376.
> Instead of exposing the writer, perhaps it would be better to have the sub-classes call #putEntities instead. It defers to the private writeTimelineEntities which does the same work to get the context:
> TimelineCollectorContext context = getTimelineEntityContext();


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