https://bugzilla.wikimedia.org/show_bug.cgi?id=41130
Tim Starling <tstarl...@wikimedia.org> changed:
What |Removed |Added
----------------------------------------------------------------------------
Summary|North america upload caches |Invalidation of Varnish
|aren't responding to squid |thumbnail cache sometimes
|purges |doesn't work
--- Comment #42 from Tim Starling <tstarl...@wikimedia.org> ---
(In reply to comment #9)
> This isn't really easy to prevent. One can do a few things:
> a) Change SquidPurgeClientPool [...]
We don't use SquidPurgeClientPool, we use HTCP.
The bug summary is "North america upload caches aren't responding to squid
purges". This is confusing since:
* Upload uses Varnish, not Squid.
* The Varnish caches in question are in fact receiving and responding to HTCP
CLR messages.
* There is no reason to think the problem is limited to North America.
I confirmed that HTCP delivery is working using tcpdump on all Varnish servers
in the cp1022-1036 range, and I checked one of them with purgeList.php to
ensure that the HTCP CLR message was correctly acted on.
Apparently the problem is not that purging doesn't work, but that on specific
occasions at some time in the past, it didn't work. Debugging that is a very
different kind of problem to debugging a complete and current failure.
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