[HDFS-15554] RBF: force router check file existence in destinations before adding/updating mount points

• Type: Improvement
• Status: Resolved
• Priority: Minor
• Resolution: Fixed
• Affects Version/s: 3.4.0
• Fix Version/s: 3.4.0
• Component/s: rbf
• Labels: pull-request-available
• Target Version/s: 3.4.0
• Hadoop Flags: Reviewed
• Assignee: Fengnan Li
• Reporter: Fengnan Li
• Created: 01/Sep/20 21:47
• Updated: 11/Feb/24 06:45
• Resolved: 21/Sep/20 17:55

Description

Adding/Updating mount points right now is only a router action without validation in the downstream namenodes for the destination files/directories.

In practice we have set up the dangling mount points and when clients call listStatus they would get the file returned, but then if they try to access the file FileNotFoundException would be thrown out.

Issue Links

• links to: GitHub Pull Request #2266
• links to: https://github.com/apache/hadoop/pull/2266