Github user aljoscha commented on the issue:
https://github.com/apache/flink/pull/2345
@StephanEwen That would probably be good, on a side note, time is
calculated in the `CheckpointCoordinator` as `<time we received ack> - <time we
started checkpoint>` right now.
This is somewhat confusing because it does not give the actual time it took
to perform the checkpoint but the time since the whole global process was
started at the checkpoint coordinator. Maybe the task has to send back some
meta-data along with the actual checkpoint data.
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