Github user mjsax commented on the pull request:
https://github.com/apache/flink/pull/750#issuecomment-135852748
I just pushed an update addressing your comments. I additionally rework all
TaskManager and JobManager test.
Open issues:
1. how to deal with (potentially blocking) `userfunction.cancel()`
2. discussion about error message vs. exception (-> `StoppingFailiure`,
`CancelFailure`, and `TaskOperationResult`)
From my point of view, the error-message vs. exception thing could be
cleaned up in a different JIRA, in case it should be changed to use the
exception approach.
For `cancel` it might be sufficient to simply document that the call must
be non blocking.
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