Is there any (preferably open source) distributed cache server that allows me to implement a custom action to run when a key's TTL expires? If not, is there any open source, light weight server I could potentially modify to make it do what I want?
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        This is not a cache server, but rather a simple in memory key/value store - redis which can have expiration set on the keys - and since the version 2.8 supports notifications when keys expire (How to get callback when key expires in REDIS and http://redis.io/topics/notifications)
 
     
    