Huang

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> Is this meant to stop receiving new tasks but let current ones finish? > Would it still be able to update leader with jobs output with raft shutdown? ![image](https://user-images.githubusercontent.com/25179277/93548586-14f37200-f99a-11ea-8fa9-d035ce2ccff3.png)...

> thx @vision9527! LGTM but can you check why the CI breaks? I have no idea about the CI error. It seems not due to my code.

@victorcoder I have merged master, but still not work.