Github user tillrohrmann commented on the pull request:
https://github.com/apache/flink/pull/640#issuecomment-97818576
The backtracking looks good @mxm.
I have some remarks concerning the way the locking of the partition on the
TMs works. At the moment this happens sequentially, meaning that for each
`IntermediateResultPartition` a message is sent to the TM and then the response
is awaited. Only after receiving the response of this TM, the next
`IntermediateResultPartition` is processed. This can considerably slow down the
scheduling if the degree of parallelism is high. I think we should make use of
Akka's future composition to do that concurrently.
Furthermore, we could think about doing the backtracking in parallel. This
could also speed up the scheduling process.
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