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Posted to issues@flink.apache.org by "Greg Hogan (JIRA)" <ji...@apache.org> on 2016/07/13 15:51:21 UTC

[jira] [Created] (FLINK-4212) Lock on pid file when starting daemons

Greg Hogan created FLINK-4212:
---------------------------------

             Summary: Lock on 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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