caching - Why does facebook use TCP for SET and UDP for GET in memcached -

July 15, 2013

Uses memcatch in He has adapted the performance of Memcatch with UDP on Linux.

But the interesting thing is that they still use TCP for set operations but use the UDP for the operation.

Why would they be doing this? I mean do not use UDP for set operation? Due to less states, better UDP scale than TCP, which needs to be maintained in the operating system.

Thank you,

Each UDP datagram has a simple frame header, its According to later versions TCP protocols are described. In the current implementation, requests should be included in a single UDP datagram, but many figures can expand in reactions. (The only common request that will increase many datagrams, they get very multi-key request and set request, which is more suitable for TCP transport for reasons of both reliability ).


















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