My question is regarding memcached. Facebook uses memcached as a cache for their structured data to reduce the latency for their users. They have optimized performance of memcached with UDP on linux. http://www.facebook.com/note.php?note_id=39391378919

But interestingly they still use TCP for set operations but use UDP for get operation.

Why would they be doing so? I mean why not use UDP for set operation also? UDP scales better than TCP because of reduced states that need to be maintained in the operating system.

Thanks,

caching memcached key-value
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