Github user yanghua commented on the issue:
https://github.com/apache/flink/pull/6296
@linjun007 thanks for your contribution, please rename the PR's title based
on this description :
```
Name the pull request in the form "[FLINK-XXXX] [component] Title of the
pull request", where FLINK-XXXX should be replaced by the actual issue number.
Skip component if you are unsure about which is the best component.
```
---
