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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