Github user zentol commented on the pull request:
https://github.com/apache/flink/pull/998#issuecomment-128605743
i would assume that forceCheckpoint is supposed to do exactly that, enforce
checkpointing regardless of its support.
this change also means that if checkPointint is enabled, but not forced,
the job will not hit an UnsupportedOperationException, which doesn't make any
sense whatsoever.
-1
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