Github user StephanEwen commented on the pull request:
https://github.com/apache/incubator-flink/pull/173#issuecomment-63957071
This adds a hook at a very sensitive point. There one blocking issue that
can cause the job to hang.
I would also not merge this without a test where the `finalizeGlobal()`
method throws an exception. That way we can be sure that the system handles
such failures properly.
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