xyuanlu opened a new pull request #1544:
URL: https://github.com/apache/helix/pull/1544
### Issues
- [X] My PR addresses the following Helix issues and references them in the
PR description:
#1543
### Description
- [X] Here are some details about my PR, including screenshots of any UI
changes:
We found there are cases after controller leadership switch, periodic
rebalancer won't work as expected.
This is caused by the definition here:
```
private static final ScheduledExecutorService _periodicalRebalanceExecutor =
Executors.newSingleThreadScheduledExecutor();
```
### Tests
- [X] The following tests are written for this issue:
Will add in next change.
- [ ] The following is the result of the "mvn test" command on the
appropriate module:
pending...
### Documentation (Optional)
- In case of new functionality, my PR adds documentation in the following
wiki page:
(Link the GitHub wiki you added)
### Commits
- My commits all reference appropriate Apache Helix GitHub issues in their
subject lines. In addition, my commits follow the guidelines from "[How to
write a good git commit message](http://chris.beams.io/posts/git-commit/)":
1. Subject is separated from body by a blank line
1. Subject is limited to 50 characters (not including Jira issue reference)
1. Subject does not end with a period
1. Subject uses the imperative mood ("add", not "adding")
1. Body wraps at 72 characters
1. Body explains "what" and "why", not "how"
### Code Quality
- My diff has been formatted using helix-style.xml
(helix-style-intellij.xml if IntelliJ IDE is used)
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