[Koha-bugs] [Bug 11078] New: rebuild_zebra.pl can lose updates due to race condition during full rebuilds

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

http://bugs.koha-community.org/bugzilla3/show_bug.cgi?id=11078

            Bug ID: 11078
           Summary: rebuild_zebra.pl can lose updates due to race
                    condition during full rebuilds
 Change sponsored?: ---
           Product: Koha
           Version: 3.14
          Hardware: All
                OS: All
            Status: NEW
          Severity: enhancement
          Priority: P4
         Component: Tools
          Assignee: dpk at randomnotes.org
          Reporter: dpk at randomnotes.org
        QA Contact: testopia at bugs.koha-community.org
        Depends on: 6435

The race condition exists whether you are doing incremental updates with
a periodic cronjob or with the new daemon mode.  Suppose you start a full
rebuild
at time T0 which will take until T20 to extract the records.  Suppose also at
T10,
a biblio or auth is updated and processed through the zebraqueue by T15.
In this situation the updated record in zebra will be overwritten when
the full rebuild records are uploaded to zebra after T20.  We prevent this
by only allowing one rebuild_zebra per koha instance to be running at one time.

This patch adds flock based locking for rebuild_zebra.pl on a per-instance
basis. This prevents races between full rebuilds and background incremental
updates from the zebraqueue table in the database.

When running in daemon mode (see bug 6435), incremental updates will be skipped
while a full rebuild is running, and resume afterwards.  A full rebuild or
other
adhoc request will wait for any previous lock to clear.

Tested by flocking the lock file while invoking rebuild_zebra.pl in
various modes (daemon, adhoc zebraqueue task, and full rebuild) using
flock program I will attach to bug.

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