Github user aljoscha commented on the pull request:
https://github.com/apache/flink/pull/812#issuecomment-110644940
I would be against merging this in the current form. What I propose is to
analyse the topology to verify that there are no checkpointed operators inside
iterations. Operators before and after iterations can be checkpointed and we
can safely allow the user to enable checkpointing.
If we have the code to analyse which operators are inside iterations we
could also disallow windows inside iterations. I think windows inside
iterations don't make sense since elements in different "iterations" would end
up in the same window. Maybe I'm wrong here though, then please correct me.
:smile:
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