[HDFS-15305] Extend ViewFS and provide ViewFSOverloadScheme implementation with scheme configurable.

• Type: Sub-task
• Status: Resolved
• Priority: Major
• Resolution: Fixed
• Affects Version/s: 3.2.1
• Fix Version/s: 3.1.4, 3.2.2, 3.3.1, 3.4.0
• Component/s: fs, hadoop-client, hdfs-client, viewfs
• Target Version/s: 3.4.0
• Hadoop Flags: Reviewed
• Assignee: Uma Maheswara Rao G
• Reporter: Uma Maheswara Rao G
• Created: 28/Apr/20 23:08
• Updated: 13/May/20 05:10
• Resolved: 05/May/20 00:58

Description

Provide ViewFsOverloadScheme implementation by extending ViewFileSystem class.

1. When target scheme and uri scheme matches, it should handle to create target filesystems different way than using FileSystem.get API.
2. Provide the flexibility to configure overload scheme.

ex: by setting hdfs scheme and impl to ViewFsOverloadScheme, users should be able to continue working with hdfs scheme uris and should be able to mount any hadoop compatible file systems as target. It will follow the same mount link configuration pattern as ViewFileSystem. 

Issue Links

• links to: GitHub Pull Request #1988