Github user zhijiangW commented on the issue:
https://github.com/apache/flink/pull/3455
@StephanEwen , I have submitted the modifications as we confirmed before.
It needs to change some previous codes and excuse my late update because of a
little busy last week.
BTW, I found another potential bug in
`StreamingJobGraphGeneratorTest.testChainStartEndSetting`. If this test is not
executed at first, it would cause NPE problem because the `idCounter` in
`StreamTransformation` is static. And I want to fix it in another separate jira
although I have modified it in order to confirm the `clean verify` successful.
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