Thanks, Terry. That's very helpful.
On Sep 7, 2007, at 4:01 PM, Reese, Terry wrote:
So we had some similar problems related to running our rails
application using either memcache or an sql-based sessioning
solution using a number of mongrels with Apache's balancer. In the
end, I think the problem we had was related to a race condition
when setting session data between ajax calls. On the rails trac
instance, there has been a plugin developed for these types of
conditions called smartsessionstore. It works with the sql_session
plugin, meaning your sessioning will be sql based so not quite as
fast as memcache, but I'm not sure if the difference is actually
noticable to users. Here's the link: http://www.texperts.com/
2007/05/01/race-conditions-in-rails-sessions-and-how-to-fix-them/
--TR
From: [EMAIL PROTECTED] [mailto:mongrel-users-
[EMAIL PROTECTED] On Behalf Of cleaner416
Sent: Friday, September 07, 2007 10:37 AM
To: [email protected]
Subject: [Mongrel] memcached and fragment storage,session storage
with a mongrel cluster
Greetings,
I posted this not on the Rails mailing list and didn't get a
definitive
response so I thought I'd post it here, since I figure lots of you
are using
mongrel with Rails apps. Any suggestions would be greatly appreciated.
I've been using file-based fragment caching and DB-based session
caching quite extensively. I decided to try out memcached for both to
see if I could achieve a meaningful performance gain for a
particular app.
I searched around a bit and simply added two lines to my
development.rb:
config.action_controller.fragment_cache_store = :mem_cache_store
config.action_controller.session_store = :mem_cache_store
(I also changed config.action_controller.perform_caching = true for
testing )
This works like a charm on my development box. (Mac) I've got
memcached -vv
running in another terminal window I can see it doing it's thing.
However, as soon as I tried this on my production box, (by adding the
above lines to production.rb) I ran into some odd problems. My
production setup is pretty vanilla: Apache 2.2 load balancing to a
couple of mongrel instances via mongrel cluster on a fedora core 5
box. It seems as if a memcache pool is being created for each
mongrel instance, instead of the app. Is there some other kind of
config I need to do in production.rb? The stuff I've found via
googling seems to apply to Rails < 1.2
Thanks much
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