[RATIS-693] Combine notifyLeader and notifyLeaderChanged calls on StateMachine

• Type: Improvement
• Status: Resolved
• Priority: Major
• Resolution: Fixed
• Affects Version/s: 0.5.0
• Fix Version/s: 0.5.0
• Component/s: raft-group, server
• Assignee: Siddharth Wagle
• Reporter: Siddharth Wagle
• Created: 27/Sep/19 20:08
• Updated: 03/Oct/19 04:02
• Resolved: 03/Oct/19 04:02

Description

RATIS-678 introcuded notifyLeaderChanged API on the StateMachine interface which will be called to notify the statemachine when the leaderId changes on leader as well as the follower.

Downstream services like Ozone utilize this functionality to decide when the Raft group is ready to accept writes and do open the write pipeline.

Purpose of this jira is to combine notifyLeader and notifyLeaderChanged into a single API.

Issue Links

• relates to: RATIS-678 Notify Leader does not provide raft group id