jiajunwang opened a new issue #767:
URL: https://github.com/apache/helix/issues/767


   Please see the attachment, the baseline node is empty. I observed this 
multiple times in the stress test.
   
![image](https://user-images.githubusercontent.com/1803880/74579475-abb50780-4f4f-11ea-9c06-a718e327cc81.png)
   
   I suspect this is about the GC thread.
   1. ZkBucketDataAccessor.GC_THREAD should be created as a single thread pool 
instead of creating by newScheduledThreadPool() which could have more threads.
   2. To ensure the order of the clean tasks, we'd better leverage a queue 
instead of relying on the TTL.
   
   
   


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