jojochuang commented on pull request #3907:
URL: https://github.com/apache/hadoop/pull/3907#issuecomment-1028551793


   Thanks for opening a PR.
   However, I am not so sure if this is the right approach. The whole design 
namenode assumes a global namespace lock and within it, data structure access 
is consistent. Once you yield in the middle, there's no such guarantee and it 
could run into data races.
   
   As for the block report taking time -- is it still a problem after removing 
the folded tree set structure (HDFS-13671)?


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