Vinayak Hegde created HBASE-29261:
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Summary: Investigate flaw in backup deletion validation of
PITR-critical backups and propose correct approach
Key: HBASE-29261
URL: https://issues.apache.org/jira/browse/HBASE-29261
Project: HBase
Issue Type: Task
Components: backup&restore
Reporter: Vinayak Hegde
Assignee: Vinayak Hegde
This Jira investigates a flaw in our current logic used to validate whether a
full backup—potentially critical for PITR (Point-In-Time Recovery)—can be
safely deleted.
The current approach incorrectly checks whether a full backup is the only valid
base for *all* PITR target points, which is not a valid criterion. A full
backup should not be required to support _all_ PITR points to be considered
necessary. Instead, each full backup only contributes to a {*}specific PITR
time range{*}, depending on when the backup was taken and the availability of
continuous backups afterward.
This ticket proposes a more accurate and conservative approach:
* Determine the PITR range each full backup can support.
* Identify if another full backup exists that fully covers the same range.
* If such a backup exists, the original one can be considered safe for
deletion.
All edge cases and reasoning are explained in the comments for clarity.
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