Saturday, May 22, 2010

memcached - a few tips from FB

based on http://www.facebook.com/note.php?note_id=39391378919

* distributed hash map at heart
* sits between apache web server and mysql. Intercepts requests to mysql
* onMsg() updates to clients? I don't think so.
* TCP between memcached and apache. Each TCP connection occupied memory, so if there are 1000 web hosts, each running 100 Apache processes, you can get 400,000 TCP connections open to memcached. They occupy 5GB memory. Solution is UDP -- connection-less.

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New York (Time Square), NY, United States
http://www.linkedin.com/in/tanbin