AngersZhuuuu commented on pull request #30139:
URL: https://github.com/apache/spark/pull/30139#issuecomment-717004690


   > This should have a considerable impact on the performance when there are 
multiple open streams because updates of different streams would lock on a 
single object `totalChunksBeingTransferred`. Isn't that the case?
   
   Since `totalChunksBeingTransfereed` is atomic, when it update It has its own 
competition, add a lock at `totalChunksBeingTransfereed` won't have too much 
impact. And we can keep strong consistences between the streamState and the 
totalChunksBeingTransfered are updated synchronically. 


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