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From "Sangjin Lee (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (YARN-6170) TimelineReaderServer should wait to join with HttpServer2
Date Sat, 11 Feb 2017 21:37:42 GMT

    [ https://issues.apache.org/jira/browse/YARN-6170?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15862542#comment-15862542

Sangjin Lee commented on YARN-6170:


> TimelineReaderServer should wait to join with HttpServer2
> ---------------------------------------------------------
>                 Key: YARN-6170
>                 URL: https://issues.apache.org/jira/browse/YARN-6170
>             Project: Hadoop YARN
>          Issue Type: Sub-task
>          Components: timelinereader
>    Affects Versions: 3.0.0-alpha2, YARN-5355
>            Reporter: Sangjin Lee
>            Assignee: Sangjin Lee
>            Priority: Minor
>             Fix For: YARN-5355-branch-2, 3.0.0-alpha3
>         Attachments: YARN-6170.01.patch
> While I was backporting YARN-5355-branch-2 to a 2.6.0-based code branch, I noticed that
the timeline reader daemon would promptly shut down upon start. It turns out that in the 2.6.0
code line at least there are only daemon threads left once the main method returns. That causes
the JVM to shut down.
> The right pattern to start an embedded jetty web server is to call {{Server.start()}}
followed by {{Server.join()}}. That way, the server stays up reliably no matter what other
threads get created.
> It works on YARN-5355 only because there *happens* to be one other non-daemon thread.
We should add the {{join()}} call to be always correct.

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