Open Stack

Hi folks,

I am having trouble with using memcache as the keystone token backend. I
have three keystone nodes running active/active. Each is running keystone
on apache (for kerberos auth). I recently switched from using sql backend
to memcache, while have memcached running on all three of the keystone
nodes.

This setup would run well for a while, but then apache would start to hog
CPUs, and memcached would increase to 30% or so. I tried to increase
memcached cluster from 3 to 6 nodes, but in general the performance is much
worse compared to sql backend.

Any ideas?

Thanks.
-Simon
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