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: [email protected]
Reporter: [email protected]
QA Contact: [email protected]
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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