Github user StephanEwen commented on the pull request:
https://github.com/apache/flink/pull/988#issuecomment-128405914
+1 for rebalancing automatically between operators of different DOP. The
batch API does the same. But it should really be "rebalance", not a form of
forward that typically creates skew.
I am somewhat indifferent to the sink-or-no-sink question. The batch API
requires sinks strictly, and it makes total sense there. For streaming, it may
be different.
If we require sinks, we should have a simple function `sink()` or so, which
marks the operation as sink, so we don't force people to implement a
*discarding sink* or so unnecessarily.
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