[RATIS-1247] Support rolling upgrade and rollback

• Type: New Feature
• Status: Resolved
• Priority: Major
• Resolution: Fixed
• Assignee: runzhiwang
• Reporter: runzhiwang
• Created: 17/Dec/20 08:28
• Updated: 27/Dec/20 23:33
• Resolved: 27/Dec/20 23:33

Sub-Tasks

• Add transfer leadership request and proto: Resolved
• Implement transferLeaderShip in server: Resolved
• Add timeout in TransferLeadershipRequest: Resolved
• Leader send StartLeaderElectionRequest to higher priority peer: Resolved
• Abort pending request on new TransferLeadership: Resolved
• Refactor the startLeaderElection code in LeaderStateImpl: Resolved
• Support transfer leadership between nodes with same priority: Resolved
• Avoid changing priorities in TransferCommand unless necessary: Resolved
• Yield leader to higher priority peer by TransferLeadership: Resolved
• Refactor: Reduce nesting in TransferLeadership: Resolved
• Fix TransferLeadership stopped by heartbeat from old leader: Resolved
• Do not send StartLeaderElection when leaderLastEntry is null: Resolved
• Make StartLeaderElection idempotent: Resolved