[HDDS-8166] [Snapshot] Add a config to enable or disable Ozone snapshot feature on OM

• Type: Sub-task
• Status: Resolved
• Priority: Major
• Resolution: Fixed
• Fix Version/s: 1.4.0
• Component/s: Ozone Manager
• Labels: ozone-snapshot pull-request-available
• Assignee: Siyao Meng
• Reporter: Jyotirmoy Sinha
• Created: 15/Mar/23 06:52
• Updated: 08/May/23 14:15
• Resolved: 05/May/23 20:06

Description

Add an option to control whether Ozone filesystem snapshot feature is enabled or not on the OM side.

1. Add this new OM config.
2. Enable it by default (to avoid disruption with on-going dev work).
3. If disabled, all snapshot related OM background tasks would not run, all snapshot feature RPCs should be gracefully rejected.
4. Snapshot related integration tests, UTs and acceptance tests would have a line to force-enable the snapshot feature for testing so those tests would still run and pass.

Issue Links

• is a parent of: HDDS-8529 [Snapshot] Refactor OmSnapshotManager constructor to reduce initialization done when snapshot feature is disabled
• is a parent of: HDDS-8555 [Snapshot] When snapshot feature is disabled, block OM startup if there are still snapshots in the system
• links to: GitHub Pull Request #4642