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We have 3 Nginx servers that are delivering the images from a local cache.
The users upload their pictures to a central file server.
We have 3 machines working in a master-slave-slave configuration for the users' forum.
Then we have separate machines to serve the site images.Most of the tables are My ISAM which provides fast lookups. Most of the queries by primary key that we have to the users table are cached in Memcached and then delivered from there.The problem we are seeing more and more are full table locks. We have a system that lets automatically invalidate the cache every time one record of that table is modified.At the same time, all the messages that where hold in an array in memory are then sent to Rabbit MQ.In this way the user doesn't have to wait for this either.