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Merge pull request #9 from stefantalpalaru/redis-limits

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Documents Redis default key eviction policy issue.
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Bertrand Bordage 2015-02-16 20:05:37 +01:00
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docs/limits.rst
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@ -10,6 +10,19 @@ Locmem is a just a dict stored in a single Python process.
It’s not shared between processes, so don’t use locmem with django-cachalot
in a multi-processes project, if you use RQ or Celery for instance.
Redis
.....
By default, Redis will not evict persistent keys (those without an expiry set)
when the maximum memory has been reached. The keys created by django-cachalot
are persistent, so in an out of memory situation most of the site will go down
due to OOM exceptions.
To avoid this, you can change 'maxmemory-policy' to 'allkeys-lru' in redis.conf.
Be aware that this policy applies to all the databases on that server.
You'll also want to keep an eye on the redis stats and increase 'maxmemory' if
needed. This is just to improve performance, it doesn't impact site availability.
MySQL
.....