https://bugzilla.wikimedia.org/show_bug.cgi?id=20774





--- Comment #3 from Roan Kattouw <[email protected]>  2009-09-23 20:13:28 
UTC ---
Hopefully fixed with the rewrite in r56831.

Basically, the two major culprits were:
1. the code checking the timestamp of the last update.php run (to determine
whether to rebuild the l10ncache) pulled stale data from the slaves, and wasn't
smart enough to use queriedTimestamp > expectedTimestamp instead of !=
2. the initial update.php run inserted about a million rows in each of the 5
per-cluster localisation tables, using a separate REPLACE statement for each
row; this presumably slowed down replication and worsened #1.

LU now uses a file-based storage system.


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