Github user uce commented on the pull request:
https://github.com/apache/flink/pull/1518#issuecomment-172794454
Changes look good.
For the added test, changing the parallelism to 2 results in different
chaining behaviour again. Instead of 2 vertices at parallelism 1, we get 3
vertices at parallelism 2. I didn't look in detail into the chaining conditions
in the streaming job graph generator, but it looks like there is another
parallelism-dependent chaining optimization somewhere. If this is expected,
then it good to merge. +1
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