https://bugzilla.wikimedia.org/show_bug.cgi?id=52853

--- Comment #16 from Sean Pringle <[email protected]> ---
db1009 `revisions` is missing rev_id's 38674172 -> 38674177. Several other
tables checksummed (recentchanges, loging, page) also show small numbers of
missing rows and/or missing updates.

Therefore db1009 is now doing a full checksum using the percona tools. 

Based on missing row timestamps, the powercycle event seems the probable cause. 

However, don't know yet how replication replication managed to *avoid* dying
unless some funky disk syncing happened. Unfortunately relay logs don't go back
that far (preciesly because the SQL thread thought all was fine and deleted
them after processing).

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