Github user senorcarbone commented on the pull request:
https://github.com/apache/flink/pull/1537#issuecomment-174500162
Looks cool.
Just so I understand exactly, what is wrong again if the Coordinator simply
aborts expired checkpoint attempts? Wouldn't the protocol be the same, with
less messages? If a task is not ready it can simply discard the checkpoint
request which will eventually time out at the Coordinator. The Coordinator
attempts might potentially keep timing out but there will be a complete
snapshot eventually when all tasks are ready.
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