zhuxiangyi commented on pull request #3155:
URL: https://github.com/apache/hadoop/pull/3155#issuecomment-872169594


   > It has a potential to hold the fsn/fsd lock for a long time and cause 
service outage or delays.
   
   
   
   > hold the fsn/fsd lock
   
   @kihwal  Thanks for your comment. I tested to obtain quota information for 
10w directories, and its holding lock time was about 300ms. Under normal 
circumstances, our quota list is limited, I think it will not be particularly 
high, this is just my guess.
   In addition, I did a test to get only the Quota directory path, and the 10w 
directory also took 20ms. We first get the path of the quota directory, and 
then get the quota information through getQuotaUsage, is this better?


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