Github user nathanmarz commented on the pull request:
https://github.com/apache/storm/pull/349#issuecomment-87742572
Without the r/w lock the following can happen:
1. Sender S grabs a socket to worker A for task B
2. Refresh connections learns task B is now on worker C, changes the
connection, and closes the old socket
3. Sender S tries to send data on a closed socket
An atom does not protect against this.
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