Zhilei Xu created HDFS-6585:
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Summary: INodesInPath.resolve is called multiple times in
FSNamesystem.setPermission
Key: HDFS-6585
URL: https://issues.apache.org/jira/browse/HDFS-6585
Project: Hadoop HDFS
Issue Type: Improvement
Components: namenode
Reporter: Zhilei Xu
Assignee: Zhilei Xu
Attachments: patch_ab60af58e03b323dd4b18d32c4def1f008b98822.txt
Most of the APIs (both internal and external) in FSNamesystem calls
INodesInPath.resolve() to get the list of INodes corresponding to a file path.
Usually one API will call resolve() multiple times and that's a waste of time.
This issue particularly refers to FSNamesystem.setPermission, which calls
resolve() twice indirectly: one from checkOwner(), another from
dir.setPermission().
Should save the result of resolve(), and use it whenever possible throughout
the lifetime of an API call, instead of making new resolve() calls.
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