[Koha-bugs] [Bug 6435] [ENH] Added daemon mode parameters to rebuild_zebra.pl

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

http://bugs.koha-community.org/bugzilla3/show_bug.cgi?id=6435

--- Comment #32 from Doug Kingston <dpk at randomnotes.org> ---
Created attachment 22039
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http://bugs.koha-community.org/bugzilla3/attachment.cgi?id=22039&action=edit
Add locking to rebuild_zebra to prevent races

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.

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.

When running in daemon mode, 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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