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https://issues.apache.org/jira/browse/HDDS-7524?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=17640341#comment-17640341
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George Jahad commented on HDDS-7524:
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"oldest retained Snapshot" is a confusing term, (because in reality all
snapshots are retained until explicitly deleted.) Instead, how about calling
it something like: "oldest Snapshot with compaction history" or something along
those lines?
> Compaction DAG node pruning (deleting part of the DAG > oldest retained
> snapshot)
> ---------------------------------------------------------------------------------
>
> Key: HDDS-7524
> URL: https://issues.apache.org/jira/browse/HDDS-7524
> Project: Apache Ozone
> Issue Type: Sub-task
> Reporter: Hemant Kumar
> Assignee: Hemant Kumar
> Priority: Major
>
> We will have a concept of oldest retained Snapshots. We will support
> efficient Snapdiffs from snapshots as old as this oldest retained one. We
> will Delete SST file nodes in the compaction DAG that will not be used in any
> SnapDiff since this oldest retained Snapshot.
> We will continue to support SnapDiffs from older Snapshots as well. But they
> will iterate over all the keys in the namespace.
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