ZanderXu commented on PR #4497:
URL: https://github.com/apache/hadoop/pull/4497#issuecomment-1193235376

   > Looks thread-safe to me. Has this patch been tested in a production 
environment?
   
   @jojochuang Thanks for your review and sorry sorry for replaying so late. We 
have release it in our prod environment and it works well.
   
   After checking some jstacks of ObserverNamenodes, I found that there are no 
handlers blocked at `Selecting EditInputStreams`, so the performance should be 
improved.
   
   @ferhui can you help me review this patch?


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