[jira] [Updated] (YARN-6170) TimelineReaderServer should wait to join with HttpServer2

["Sangjin Lee (JIRA)" <ji...@apache.org>]

     [ https://issues.apache.org/jira/browse/YARN-6170?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]

Sangjin Lee updated YARN-6170:
------------------------------
    Labels:   (was: yarn-5355-merge-blocker)

> 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: YARN-5355
>            Reporter: Sangjin Lee
>            Assignee: Sangjin Lee
>            Priority: Minor
>
> 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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