maobaolong created HDFS-12803:
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             Summary: We should not lock FsNamesystem even we operate a sub 
directory, we should refinement the lock
                 Key: HDFS-12803
                 URL: https://issues.apache.org/jira/browse/HDFS-12803
             Project: Hadoop HDFS
          Issue Type: Bug
          Components: hdfs
    Affects Versions: 3.0.0-alpha3, 2.7.1
            Reporter: maobaolong


An example:

If a client is doing mkdir or delete a file, other client will wait for the 
FSNamesystem's lock to do some operation.

I think we have to refinement the lock. we can lock the parent inode only.



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