[HDFS-15464] ViewFsOverloadScheme should work when -fs option pointing to remote cluster without mount links

• Type: Sub-task
• Status: Resolved
• Priority: Major
• Resolution: Fixed
• Affects Version/s: 3.2.1
• Fix Version/s: 3.3.1, 3.4.0, 3.2.3
• Component/s: viewfsOverloadScheme
• Target Version/s: 3.4.0
• Hadoop Flags: Reviewed
• Assignee: Uma Maheswara Rao G
• Reporter: Uma Maheswara Rao G
• Created: 10/Jul/20 05:23
• Updated: 17/May/21 03:23
• Resolved: 12/Jul/20 06:51

Description

When users try to connect to remote cluster from the cluster env where you enabled ViewFSOverloadScheme, it expects to have at least one mount link make fs init success.
Unfortunately you might not have configured any mount links with that remote cluster in your current env. You would have configured only with your local clusters mount points.
In this case fs init will fail with no mount points configured the mount table if that remote cluster uri's authority.

One idea is that, when there are no mount links configured, we should just consider that as default cluster, that can be achieved by considering it as fallback option automatically.

Issue Links

• fixes: HDFS-15454 ViewFsOverloadScheme should not display error message with "viewfs://" even when it's initialized with other fs.
• links to: GitHub Pull Request #2132