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tutor/changelog.d/20240208_111236_regis_infinite_course_cache.md
Régis Behmo 59b1987ff1 fix: infinite cache growth 
See the discussion here: https://github.com/overhangio/tutor/pull/984
And the upstream PR here: https://github.com/openedx/edx-platform/pull/34210

The tl;dr is that the Redis course structure cache was growing without
bounds. While the upstream fix should resolve that issue, we decided
that Tutor should have a maxmemory limit and an eviction policy set for
operational safety.

Thus, Redis now has a 4gb maxmemory. If you need more memory on your
instance, you should implement the "redis-conf" patch.

To manually expire existing keys, run:

    tutor local run cms ./manage.py cms shell -c "from django.core.cache import caches; c = caches['course_structure_cache']; [c.expire(key, 604800) for key in c.keys('*')]"
2024-02-19 09:43:40 +01:00

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  • 💥[Bugfix] Prevent infinite growth of course structure cache in Redis. (by @regisb)
    • Redis is now configured with a maximum memory size of 4GB. If this is too low for your platform, you should increase this value using the new "redis-conf" patch.
    • Make sure that course structure cache keys have an actual timeout.
  • [Feature] Introduce the "redis-conf" patch. (by @regisb)