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[Morgan Fainberg <morgan.fainberg@xxxxxxxxx>]

** Also affects: keystone/mitaka
   Importance: Medium
     Assignee: Morgan Fainberg (mdrnstm)
       Status: In Progress

** Also affects: keystone/newton
   Importance: Undecided
       Status: New

** Changed in: keystone/newton
   Importance: Undecided => Medium

** Changed in: keystone/newton
     Assignee: (unassigned) => Morgan Fainberg (mdrnstm)

** Changed in: keystone/newton
       Status: New => In Progress

** Changed in: keystone/newton
    Milestone: None => newton-1

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Engineering Team, which is subscribed to OpenStack Identity (keystone).
https://bugs.launchpad.net/bugs/1567403

Title:
  Local context cache seems to work improperly

Status in OpenStack Identity (keystone):
  In Progress
Status in OpenStack Identity (keystone) mitaka series:
  In Progress
Status in OpenStack Identity (keystone) newton series:
  In Progress

Bug description:
  == Abstract ==

  I'm profiling Keystone using OSprofiler tool and the appropriate
  Keystone+OSprofiler integration changes -
  https://review.openstack.org/#/q/status:open+project:openstack/keystone+branch:master+topic
  :osprofiler-support-in-keystone - currently on review. The idea was to
  analyse how does Keystone use DB/Cache layers.

  == Expected ==

  The local context cache added during Mitaka should cache key-value
  pairs per every keystone request and grab cached value from it where
  possible in memoize instead of hitting to Memcache.

  == Observed ==

  During the nova-boot request keystone API is hit 3 times including all
  python clients work. If we'll take a look, for instance, on the
  get_domain function, it's called twice per one API call, and both
  times it's going to the Memcache without local cache usage.

  Memcache points can appear in the trace only if memcache is *really*
  used, not just try to grab value from it. Also
  /opt/stack/keystone/keystone/common/cache/_context_cache.py file was
  modified to check if
  https://github.com/openstack/keystone/blob/master/keystone/common/cache/_context_cache.py#L78-L80
  were called == local cache used. Nothing?

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