--- Comment #36 from Tim Starling <tstarl...@wikimedia.org> 2010-09-28 02:14:58
ImageAnnotator can be re-enabled for now.
Further testing indicates that the "byte hit ratio" figure in squid includes
error messages, and a lot of them were probably being sent at the time in
question. The error counters (server.http.errors and client_http.errors) are
apparently broken and never incremented.
The issue occurred at peak time, disabling action=purge probably reduced the
server load to slightly below peak, bringing demand back under capacity. There
are several things we could have disabled which would have had the same effect.
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