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From "Sangjin Lee (JIRA)" <j...@apache.org>
Subject [jira] [Created] (YARN-6170) TimelineReaderServer should wait to join with HttpServer2
Date Fri, 10 Feb 2017 06:40:41 GMT
Sangjin Lee created YARN-6170:
---------------------------------

             Summary: 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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