#25824: Assertions in libmemcached when multiple
django.core.cache.backends.memcached.PyLibMCCache backends used
-------------------------------+--------------------------------------
Reporter: mlowicki | Owner: nobody
Type: Uncategorized | Status: new
Component: Uncategorized | Version: 1.8
Severity: Normal | Resolution:
Keywords: | Triage Stage: Unreviewed
Has patch: 0 | Needs documentation: 0
Needs tests: 0 | Patch needs improvement: 0
Easy pickings: 0 | UI/UX: 0
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Changes (by mlowicki):
* needs_better_patch: => 0
* needs_tests: => 0
* needs_docs: => 0
Old description:
> We're running Django 1.8.3 via uWSGI with threads enabled (uWSGI
> 2.0.11.5, configuration -
> [https://gist.github.com/mlowicki/9a5042b5411537a51bbf]).
>
> When two backends using
> 'django.core.cache.backends.memcached.PyLibMCCache' are added and are
> used (each box is handling at least hundreds requests per second) then in
> uWSGI logs we're seeing lots of
> [https://gist.github.com/mlowicki/a8b3dbd98f32dc40c4eb] and application
> is misbehaving throwing 500s. When launched in second datacenter with
> much less threads then problem is much smaller but still exists (uWSGI
> configuration - [https://gist.github.com/mlowicki/cbd18c689c3e2f838bf0])
New description:
We're running Django 1.8.3 via uWSGI with threads enabled (uWSGI 2.0.11.5,
configuration - [https://gist.github.com/mlowicki/9a5042b5411537a51bbf]).
When two backends using
'django.core.cache.backends.memcached.PyLibMCCache' are added and are used
(each box is handling at least hundreds requests per second) then in uWSGI
logs we're seeing lots of
[https://gist.github.com/mlowicki/a8b3dbd98f32dc40c4eb] and application is
misbehaving throwing 500s. When launched in second datacenter with much
less threads then problem is much smaller but still exists (uWSGI
configuration - [https://gist.github.com/mlowicki/cbd18c689c3e2f838bf0])
Tried with pylibmc 1.4.1 and 1.5.0.
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Ticket URL: <https://code.djangoproject.com/ticket/25824#comment:1>
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