On Tue, Dec 18, 2012 at 2:22 PM, Daniel Renfro <bluecurio(a)gmail.com> wrote:
I guess the session data
in memcached is just as volatile as any other data in memcached, i.e. it is
subject to being invalidated over time or being deleted to make room for
other cached data. Is there a way I can pinpoint what is going on here?
That seems plausible. Looking at the amount of memory memcached uses over
time might give you a rough idea, but there are tools that will let you
look inside memcached to see whether it's dropping things.
Incidentally, MediaWiki 1.20 includes $wgSessionCacheType, which allows you
to have the sessions stored in a different place from the other object
caches (if you were looking for reasons to upgrade :-) ).