NetUtils.connect should check that it hasn't connected a socket to itself
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Key: HADOOP-6722
URL: https://issues.apache.org/jira/browse/HADOOP-6722
Project: Hadoop Common
Issue Type: Bug
Components: util
Reporter: Todd Lipcon
Assignee: Todd Lipcon
I had no idea this was possible, but it turns out that a TCP connection will be
established in the rare case that the local side of the socket binds to the
ephemeral port that you later try to connect to. This can present itself in
very very rare occasion when an RPC client is trying to connect to a daemon
running on the same node, but that daemon is down. To see what I'm talking
about, run "while true ; do telnet localhost 60020 ; done" on a multicore box
and wait several minutes.
This can be easily detected in NetUtils.connect by making sure the local
address/port is not equal to the remote address/port.
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