Reviewed: https://review.openstack.org/304688
Committed:
https://git.openstack.org/cgit/openstack/oslo.cache/commit/?id=ea191cacb14818989564ffe1f3727f28be3c3a21
Submitter: Jenkins
Branch: master
commit ea191cacb14818989564ffe1f3727f28be3c3a21
Author: Morgan Fainberg <morgan.fainb...@gmail.com>
Date: Tue Apr 12 08:09:17 2016 -0700
If caching is globally disabled force dogpile to use the null backend
Due to the way caching is disabled the SHOULD_CACHE_FN() is used
to determine if new values are stored in the cache backend, and is
only called when the regeneration is required. If dogpile is
configured to connect to a memcache, redis, etc to store data
it is possible with caching disabled to still pull values from
the cache (SHOULD_CACHE_FN has no bearing on reads).
The issue described only impacts the use of the memoization
decorator.
This change forces dogpile to use the null backend if caching is
globally disabled to ensure no data is read from the external
cache. This will not affect subsystem disabling of cache.
Even with cache disabled but reads coming from the external cache,
there stale data is not a concern as invalidates will still be
processed and the data from the backend will eventually timeout
in most cases.
Change-Id: I845b6cc18faa2be516676eeacc574473ca84c995
Closes-Bug: #1567413
** Changed in: oslo.cache
Status: In Progress => Fix Released
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https://bugs.launchpad.net/bugs/1567413
Title:
Keystone fetches data from Memcache even if caching is explicitly
turned off
Status in OpenStack Identity (keystone):
Invalid
Status in oslo.cache:
Fix Released
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 vs Observed==
I'm turning off cache via setting
[cache]
enabled = False
I'm expecting all data to be fetched from DB in this case, but I still
see gets from Memcache. I mean, *real* gets, not just tries to grab
values, but real operations happening with values got from memcache
here
https://bitbucket.org/zzzeek/dogpile.cache/src/c6913eb143b24b4a886124ff0da5c935ea34e3ac/dogpile/cache/region.py?at=master&fileviewer
=file-view-default#region.py-617
Adding OSprofiler HTML report from token issue API call.
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