[HADOOP-13885] Implement getLinkTarget for ViewFileSystem

• Type: Task
• Status: Resolved
• Priority: Major
• Resolution: Fixed
• Affects Version/s: 3.0.0-alpha1
• Fix Version/s: 3.0.0-alpha2
• Component/s: viewfs
• Target Version/s: 3.0.0-alpha2
• Assignee: Manoj Govindassamy
• Reporter: Manoj Govindassamy
• Created: 09/Dec/16 20:43
• Updated: 10/Jan/17 02:33
• Resolved: 10/Jan/17 02:01

Description

ViewFileSystem doesn't override FileSystem#getLinkTarget(). So, when view filesystem is used to resolve the symbolic links, the default FileSystem implementation throws UnsupportedOperationException.

The proposal is to define getLinkTarget() for ViewFileSystem and invoke the target FileSystem for resolving the symbolic links. Path thus returned is preferred to be a viewfs qualified path, so that it can be used again on the ViewFileSystem handle.