Comment 7 for bug 1581133

Anyway, I got this from current keystone master after "tox -e genconfig" in etc/keystone.conf:
[cache]
...
# Dogpile.cache backend module. It is recommended that Memcache with pooling
# (oslo_cache.memcache_pool) or Redis (dogpile.cache.redis) be used in
# production deployments. Small workloads (single process) like devstack can
# use the dogpile.cache.memory backend. (string value)
#backend = dogpile.cache.null

As we use this options, do we cache somethig for keystone?
Is there an error in docs (it recommends "oslo_cache.memcache_pool")?

I'm confused a bit about this topic, please, help me understand the situation.
How configuration should look like?