Github user zhijiangW commented on the issue:
https://github.com/apache/flink/pull/4552
1. Thanks for you FLINK08425.
2. I would have thought the tests for
`ResultSubpartition#nextBufferIsEvent` which have already been covered before.
The test for `BufferAndBacklog#nextBufferIsEvent()` is not included before, and
thanks for providing the patch for it.
3. I will create a separate JIRA for the switch and also include the commit
in this PR. And check the travis fail.
4. I will add the comment for the document you mentioned later.
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