Erik Krogen created HDFS-13602:
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             Summary: Optimize checkOperation(WRITE) check in FSNamesystem 
getBlockLocations
                 Key: HDFS-13602
                 URL: https://issues.apache.org/jira/browse/HDFS-13602
             Project: Hadoop HDFS
          Issue Type: Improvement
          Components: ha, namenode
            Reporter: Erik Krogen
            Assignee: Chao Sun


Similar to the work done in HDFS-4591 to avoid having to take a write lock 
before checking if an operation category is allowed, we can do the same for the 
write lock that is taken sometimes (when updating access time) within 
getBlockLocations.

This is particularly useful when using the standby read feature (HDFS-12943), 
as it will be the case on an observer node that the operationCategory(READ) 
check succeeds but the operationCategory(WRITE) check fails. It would be ideal 
to fail this check _before_ acquiring the write lock.



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