jianghuazhu commented on pull request #3822:
URL: https://github.com/apache/hadoop/pull/3822#issuecomment-1000052067


   Thanks @ayushtkn  for the comment and review.
   When the call needs to be called again into the queue, this means that the 
Handler will give up the call, and numInProcessHandler will first decrease by 
1. For example:
   `
   finally {
             CurCall.set(null);
             numInProcessHandler.decrementAndGet();
             IOUtils.cleanupWithLogger(LOG, traceScope);
   `
   When the Handler gets a new call, numInProcessHandler will execute the new 
process again.
   In general, numInProcessHandler will tend to a stable state.


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