Github user StephanEwen commented on the pull request:
https://github.com/apache/flink/pull/1139#issuecomment-141049427
The change set is large, but the overlap with the existing code base is not
too big. A bit in the JobGraph and JobManager, mainly for attaching extra
information and accessing accumulators, that is it. It introduces no change to
any other component, so should be pretty non-critical.
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