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https://issues.apache.org/jira/browse/HDDS-8555?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Siyao Meng updated HDDS-8555:
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Status: Patch Available (was: Open)
> [Snapshot] When snapshot feature is disabled, block OM startup if there are
> still snapshots in the system
> ---------------------------------------------------------------------------------------------------------
>
> Key: HDDS-8555
> URL: https://issues.apache.org/jira/browse/HDDS-8555
> Project: Apache Ozone
> Issue Type: Sub-task
> Components: OM
> Reporter: Siyao Meng
> Assignee: Siyao Meng
> Priority: Major
> Labels: pull-request-available
>
> This is another follow-up to HDDS-8166.
> Even though theoretically HDDS-8166's approach should work just fine even
> when snapshots are taken *before* snapshot feature is set to disabled (Note:
> those key blocks will be forever stuck in the cluster because KeyDeletingTask
> still checks against existing snapshots and won't reclaim key blocks that are
> still referenced. Only when snapshot feature is enabled again and snapshots
> deleted, those blocks can be cleaned up.), as a precaution, we want to add a
> check during OM startup to *make sure there are zero snapshots on the cluster
> when snapshot feature is disabled*. This can be achieved by checking
> snapshotInfoTable emptiness.
> The snapshot feature flag is not meant to be constantly toggled on and off.
> The supported use case is that for a fresh OM cluster that doesn't want to
> Ozone snapshot feature to be used, it would be explicitly set to false at the
> beginning.
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