Github user tillrohrmann commented on the pull request:
https://github.com/apache/flink/pull/1153#issuecomment-145554976
Great piece of work @uce :-) I've gone through the code and added some
comments. The main points are
* the exception handling in `ZooKeeperSubmittedJobGraphs` which can fail
the job submission if two JMs try to write `JobGraphs` with the same `JobID`
* and the usage of a shared counter which could maybe replaced by creating
the `SuccessfulCheckpoint` nodes in `PERSISTENT_SEQUENTIAL` mode
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