Comment 3 for bug 1946117

> Keystonemiddleware makes requests to an identity server.

FWIW, keystonemiddleware (at least in Ocata) goes first into memcache (tested via tcpdump), so it may finish here if cache is actual and exists.

The main problem is keystone's speed. From one side it's right - microservices, communication via http, from the other side - if it's too slow - cache unification may be a viable choice.

Of course, truly right answer is to make keystone service just as fast as memcache.