[HDFS-15529] getChildFilesystems should include fallback fs as well

• Type: Sub-task
• Status: Resolved
• Priority: Critical
• Resolution: Fixed
• Affects Version/s: 3.4.0
• Fix Version/s: 3.3.1, 3.4.0
• Component/s: viewfs, viewfsOverloadScheme
• Labels: pull-request-available
• Target Version/s: 3.4.0
• Hadoop Flags: Reviewed
• Assignee: Uma Maheswara Rao G
• Reporter: Uma Maheswara Rao G
• Created: 12/Aug/20 20:47
• Updated: 13/Sep/20 03:50
• Resolved: 03/Sep/20 18:12

Description

Currently getChildSystems API used by many other APIs, like 

getAdditionalTokenIssuers, getTrashRoots etc.

If fallBack filesystem not included in child filesystems, Application like YARN who uses getAdditionalTokenIssuers, would not get delegation tokens for fallback fs. This would be a critical bug for secure clusters.

Similarly, trashRoots. when applications tried to use trashRoots, it will not considers trash folders from fallback. So, it will leak from cleanup logics. 

 

Issue Links

• links to: GitHub Pull Request #2234
• links to: GitHub Pull Request #2234