delta/gitlab/gitlab-ce.git/config/initializers/0_thread_cache.rb, branch document-lambda-deploy gitlab.com: gitlab-org/gitlab-ce.git Add a memory cache local to the thread to reduce Redis load 2019-07-02T05:23:01+00:00 Stan Hu stanhu@gmail.com 2019-07-01T19:17:37+00:00 978647c6cb0f81c3695c4d20e98619c2025532c5 Loading `ApplicationSetting` from Redis was responsible for at least 50% of the CPU load of the Redis cluster on GitLab.com. Since these values generally don't change very much, we can load this from the database and cache it in memory, skipping Redis altogther. We use `ActiveSupport::Cache::MemoryStore` as a drop-in replacement for `RedisCacheStore` even though we probably don't need synchronized access within `Thread.current`. Closes https://gitlab.com/gitlab-org/gitlab-ce/issues/63977 
Loading `ApplicationSetting` from Redis was responsible for at least 50%
of the CPU load of the Redis cluster on GitLab.com. Since these values
generally don't change very much, we can load this from the database and
cache it in memory, skipping Redis altogther. We use
`ActiveSupport::Cache::MemoryStore` as a drop-in replacement for
`RedisCacheStore` even though we probably don't need synchronized access
within `Thread.current`.

Closes https://gitlab.com/gitlab-org/gitlab-ce/issues/63977