Github user ggevay commented on the pull request:
https://github.com/apache/flink/pull/1517#issuecomment-181907722
What I'm not sure about is the `closeUserCode` call in
`ChainedReduceCombineDriver.closeTask`. Those other chained drivers that have a
`running` flag for indicating canceling, make this call only when the driver
was not canceled. But those other chained drivers where there is no `running`
flag seem to make this call also when they were canceled. What is the reasoning
behind this situation?
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