[HDDS-3829] Introduce Layout Feature interface in Ozone

• Type: Sub-task
• Status: Resolved
• Priority: Major
• Resolution: Fixed
• Component/s: Ozone Manager
• Labels: pull-request-available
• Target Version/s: 1.2.0
• Assignee: Aravindan Vijayan
• Reporter: Aravindan Vijayan
• Created: 18/Jun/20 14:00
• Updated: 25/Jan/21 17:14
• Resolved: 01/Sep/20 00:15

Description

• Implement the concept of a 'Layout Feature' in Ozone (with sample usage in Ozone Manager), which defines a specific change in on-disk layout in Ozone.
• Every feature is associated with a layout version, and an API corresponding to the feature cannot be invoked (throws NOT_SUPPORTED_OPERATION) before finalization.
• Created an annotation based 'aspect' for "guarding" new APIs that are introduced by Layout Features. Check out TestOMLayoutFeatureAspect#testCheckLayoutFeature.
• Added sample features and tests for ease of review (To be removed before commit).
• Created an abstract VersionManager and an inherited OM Version manager to initialize features, check if feature is allowed, check need to finalize, do finalization.

Issue Links

• links to: GitHub Pull Request #1322