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From "Haibo Chen (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (YARN-6455) Enhance the timelinewriter.flush() race condition fix
Date Thu, 27 Apr 2017 17:23:04 GMT

    [ https://issues.apache.org/jira/browse/YARN-6455?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15987078#comment-15987078
] 

Haibo Chen commented on YARN-6455:
----------------------------------

Thanks for your review, Joep and Varun!

> 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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