QiuMM commented on issue #6336: update insert pending segments logic to 
synchronous
URL: https://github.com/apache/incubator-druid/pull/6336#issuecomment-446211138
 
 
   @FaxianZhao @jihoonson I think this PR should be reverted, after merged this 
PR, it takes very long time to open the overlord console. In my scenario, there 
are 1200 peon tasks and we use mysql as the metastore. In this PR, use 
`TaskLockbox#doInCriticalSection` to perform allocating pending segments which 
seems would block other things. After revert this, my overlord work fine again.
   
   
![lark20181211-215648](https://user-images.githubusercontent.com/15156517/49805286-bd20e380-fd8f-11e8-9c9e-4d44d2cf7b18.png)
   

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