Uma Maheswara Rao G created HDFS-15701:
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Summary: Add resolveMountPath API in FileSystem
Key: HDFS-15701
URL: https://issues.apache.org/jira/browse/HDFS-15701
Project: Hadoop HDFS
Issue Type: Sub-task
Components: fs, ViewHDFS
Affects Versions: 3.4.0
Reporter: Uma Maheswara Rao G
Assignee: Uma Maheswara Rao G
Currently FileSystem has an API resolvePath. To know where the path has
mounted, the applications can use that API as the retuned path is from actual
target path in the case of mount file systems like ViewFS, ViewFSOverloadScheme
or ViewDistributedFileSystem.
However, resolvePath does more than what is needed by Apps when they want to
know where the path has mounted. It's because resolvePath internally calls
"getFileStatus".
This additional call is unnecessary when apps just want to where the path
mounted.
Since we have mounted filesystems available in FS, I think it's good to add
resolveMountPath API, which will just do the following.
If the fs is mounted fs, then it will resolve it's mount tables and return the
actual target path. If the fs is non mounted, then it will simply return the
same path.
Currently Applications like Hive, Ranger using resolvePath API. ( this is
forcing to do additional RPC internally)
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