Github user sachingoel0101 commented on the pull request:
https://github.com/apache/flink/pull/944#issuecomment-125216770
Adding these checks however already make sure the older task manager or job
manager will be able to register with the new ones because the message objects
have changed. [I'm not sure however. Is it possible that the older messages
will be cast into the newer ones when transmitted over network?]
If that is the case, we should add new names for the messages, and
specifically fail for the older messages.
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