Fix for using memcache store in mongrel cluster

Hi,

I was having problem with disappearing sessions when storing them in
memcache and when runnning as mongrel cluster in production environment.
I’ve created a patch and it seems it’s now okay. A message to rails-core
including the link to patch http://dev.rubyonrails.org/ticket/9823 can
be
found in the group here:
http://groups.google.com/group/rubyonrails-core/browse_thread/thread/6427c8fda42683c2

Kamil