ZanderXu commented on PR #4559:
URL: https://github.com/apache/hadoop/pull/4559#issuecomment-1195172042

   Thanks @slfan1989 for your review. 
   
   > This command can temporarily modify the log level.
   
   This command can change the log level of the logger. But it will print all 
debug log of the logger.
   
   
   > If you directly modify the log level, will the log size be very large, 
after all, this is a block-level log?
   
   The log size is controllable because `logEveryBlock` will control it. And 
although it's a block-level log, it only printed the log when the replica of 
the block is changed. 
   
   Maybe we should think about its use. This log is very helpful for us to 
locate some abnormal case about block-level of block, such as complete failure, 
missing block, etc...


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