[jira] [Created] (HDFS-5681) renewLease should not hold fsn write lock

[Daryn Sharp (JIRA)]

Daryn Sharp created HDFS-5681:
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             Summary: renewLease should not hold fsn write lock
                 Key: HDFS-5681
                 URL: https://issues.apache.org/jira/browse/HDFS-5681
             Project: Hadoop HDFS
          Issue Type: Bug
          Components: namenode
    Affects Versions: 2.0.0-alpha, 3.0.0
            Reporter: Daryn Sharp


Lease renewals unnecessarily hold the write lock which reduces throughput.  
Currently the fsn lock doubles as an "operational lock" to prevent state 
transitions.  If the lease manager is thread-safe then a read lock is 
sufficient.



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