[HBASE-18547] Provide better cleanup of WAL related entries in backup table

• Type: Bug
• Status: Open
• Priority: Major
• Resolution: Unresolved
• Labels: backup
• Assignee: Unassigned
• Reporter: Ted Yu
• Created: 09/Aug/17 19:37
• Updated: 24/Sep/18 01:36

Description

I was discussing the design around incremental backup with Vladimir.

Currently if WAL file is recorded in backup table, BackupLogCleaner would signal that the file can be cleaned up.
However, cleaner chore doesn't notify BackupLogCleaner whether the file is actually deleted.
This means that potentially large number of WAL file entries would stay in backup table.

This issue is to investigate better cleanup strategy for the WAL entries.