[Mongrel] Mongrel and MemcacheSessionStore

snacktime snacktime at gmail.com
Sun Feb 4 20:24:31 EST 2007

> The application in question was running fine in the production
> environment with SQLSessionStore and using a mongrel cluster behind a
> load balancer. However, by switching to a MemcacheSessionStore (using
> either memcache-client or Ruby-MemCache), users kept being logged out
> due to the fact that the processes lost their connection to the memcache
> server (they reconnected but the users were already "logged out").

Personally, I wouldn't ever use memcache without a persistent backing
store for sessions.    It works best when writes always hit memcache
and the backing store, and reads check memcache first then fall back
to the persistent store.  Assuming a normal scenario where you aren't
writing to the session store that often, then your cache hit rate will
still be pretty good and your site won't stop working if memcache


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