Github user StephanEwen commented on the pull request:
https://github.com/apache/flink/pull/1537#issuecomment-174491828
Good fix.
I think if we want to be on the super safe side, actually all tasks should
always report back to the JobManager that they received the "TriggerCheckpoint"
message (either Ack or Decline).
The CheckpointCoordinator would then "ask" the TaskManagers and would
cancel the checkpoint if some of the asks time out (3-5 secs or so). That way,
lost messages are properly accounted for.
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