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