Github user zentol commented on the pull request:
https://github.com/apache/flink/pull/998#issuecomment-128641012
If you read the message of the UnsupportedOperationException you'll find
this bit:
> The user can force enable state checkpoints with the reduced guarantees
by calling: env.enableCheckpointing(interval,true)
There is a little disparity here between the exception message and the
comment, specifically the word "forbid" is probably the cause for this PR.
the comment could probably be removed as the exception msg is sufficient to
explain the current behaviour. imho this would be kinda unnecessary though.
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