At 2014-12-04 01:00:00 UTC we plan to restart the labs DB replica instances, one by one, in order to upgrade to MariaDB 10.0.15. Expected downtime is less than one hour.
This is related to the recent replication consistency issues. MariaDB 10.0.15 includes the fix for https://tokutek.atlassian.net/browse/DB-739 Sean -- DBA @ WMF
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