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From "ASF GitHub Bot (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (FLINK-4212) Lock PID file when starting daemons
Date Thu, 04 Aug 2016 13:08:20 GMT

    [ https://issues.apache.org/jira/browse/FLINK-4212?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15407715#comment-15407715
] 

ASF GitHub Bot commented on FLINK-4212:
---------------------------------------

Github user uce commented on the issue:

    https://github.com/apache/flink/pull/2251
  
    Checked it out locally and all processes start up as expected. @greghogan I think it's
good to merge.


> Lock PID file when starting daemons
> -----------------------------------
>
>                 Key: FLINK-4212
>                 URL: https://issues.apache.org/jira/browse/FLINK-4212
>             Project: Flink
>          Issue Type: Improvement
>          Components: Startup Shell Scripts
>    Affects Versions: 1.1.0
>            Reporter: Greg Hogan
>            Assignee: Greg Hogan
>
> As noted on the mailing list (0), when multiple TaskManagers are started in parallel
(using pdsh) there is a race condition on updating the pid: 1) the pid file is first read
to parse the process' index, 2) the process is started, and 3) on success the daemon pid is
appended to the pid file.
> We could use a tool such as {{flock}} to lock on the pid file while starting the Flink
daemon.
> 0: http://mail-archives.apache.org/mod_mbox/flink-user/201607.mbox/%3CCA%2BssbKXw954Bz_sBRwP6db0FntWyGWzTyP7wJZ5nhOeQnof3kg%40mail.gmail.com%3E



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