[Koha-bugs] [Bug 15529] New: Process Message Queue may send duplicate emails if process is launched twice

[bugzilla-daemon at bugs.koha-community.org]

http://bugs.koha-community.org/bugzilla3/show_bug.cgi?id=15529

            Bug ID: 15529
           Summary: Process Message Queue may send duplicate emails if
                    process is launched twice
 Change sponsored?: ---
           Product: Koha
           Version: master
          Hardware: All
                OS: All
            Status: NEW
          Severity: enhancement
          Priority: P5 - low
         Component: Notices
          Assignee: koha-bugs at lists.koha-community.org
          Reporter: barton at bywatersolutions.com
        QA Contact: testopia at bugs.koha-community.org

Neither process_message_queue.pl nor C4::Letters::SendQueuedMessages have any
method of ensuring that duplicate emails are not sent if two or more instances
of process_message_queue.pl are running concurrently.

This seems to have caused issues on a server which was re-running cron jobs
because the system clock was re-set by NTP, but it could also cause issues if
process_message_queue.pl took a very long time to process.

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