Github user mxm commented on the pull request:
https://github.com/apache/flink/pull/1083#issuecomment-138923111
@sachingoel0101 I've opened a pull request some time ago to backtrack
intermediate results on the network layer and then "backtrack" them during
scheduling time: #640. At that time, I realized that this doesn't make much
sense without a proper session management.
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