Ying Zhou

Results 3 issues of Ying Zhou

![image](https://user-images.githubusercontent.com/26624606/39353498-73eeb2fe-4a3a-11e8-84fd-0b8745c5ef7f.png)

### Describe the bug when a task reopen, the percent complete of a task is forced to 50% ### Context Device: (Pixel 2 API 28) and (Nexus 5 API 28)...

### What is the purpose of this PR - This PR fixes the error resulting from the flaky test ``org.apache.druid.java.util.emitter.core.EmitterTest`` - The mentioned test may fail or pass without changes...

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