I have a 5 server distribute memcached pool which is used in WordPress as an object cache. I have an intermittent issue with 2 symptoms. The first symptom is that one particular cache key will intermittently fail to expire resulting in stale data in the app when there is fresh data in the database. The second symptom is I am unable to delete the key either using the php-memcache client or directly through telnet. When i issue the following comment "delete wp_:options:alloptions" in telnet on the server where the key is stored i get "ERROR". Every time this happens I have to restart all of the memcached daemons and this fixes the problem but it really sucks because i can't do this during peak traffic times without bringing down the site for several minutes. The data that goes into this key is an array that when serialized is approximately 500KB. I am not able to duplicate the problem on my local dev environment or on our staging server so that leads me to believe there is an issue that surfaces when memcache is under higher loads. Any thoughts on why this is happening or have I found a bug?
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