https://bugzilla.wikimedia.org/show_bug.cgi?id=40209

--- Comment #7 from Aaron Schulz <[email protected]> 2012-09-14 04:46:00 
UTC ---
Caused by https://gerrit.wikimedia.org/r/#/c/23607/ (slightly non-obvious).

Given our multiwrite config, quick operations only write to the master backend.
This was done so thumbnails/temp files don't touch ms5/ms7. However, since
timeline reads don't come from swift, users got 404s.

All of the timeline files have been migrated to swift, and ideally we'd have
changed the ACLs to use swift by now. In any case, a hack is in place to just
use doOperations() with all of the performance flags set manually.

A script is copying files only on Swift to NFS so that 404s start to go away
(timeline won't recreate them itself since it already sees that they are in
swift). This fixed http://test.wikipedia.org/wiki/User:Aaron_Schulz/timeline.

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