RPC should send a ping rather than use client timeouts
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Key: HADOOP-2188
URL: https://issues.apache.org/jira/browse/HADOOP-2188
Project: Hadoop
Issue Type: Improvement
Components: ipc
Reporter: Owen O'Malley
Fix For: 0.16.0
Current RPC (really IPC) relies on client side timeouts to find "dead" sockets.
I propose that we have a thread that once a minute (if the connection has been
idle) writes a "ping" message to the socket. The client can detect a dead
socket by the resulting error on the write, so no client side timeout is
required. Also note that the ipc server does not need to respond to the ping,
just discard it.
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