[HDDS-7968] [Snapshot] Improve KeyDeletingService to reclaim eligible key blocks in snapshot's deletedTable

• Type: Sub-task
• Status: Resolved
• Priority: Critical
• Resolution: Fixed
• Labels: pull-request-available
• Assignee: Aswin Shakil
• Reporter: Siyao Meng
• Created: 14/Feb/23 21:08
• Updated: 08/Oct/23 19:24
• Resolved: 23/Jun/23 00:06

Description

Deep cleaning snapshot's deletedTable and deletedDirectoryTable.

From Snapshot GC design doc §4.d)2.

If the active filesystem’s deletedTable is already empty, the background task can optionally start walking back the snapshot chain for each bucket in order to start cleaning up the deletedTable in the existing DB checkpoints. Iterate over each DB checkpoint’s deletedTable ..

Issue Links

• links to: GitHub Pull Request #4935