[RATIS-2008] Follower should recognize candidate if the candidate is the same peer as the current recognized leader

• Type: Improvement
• Status: Resolved
• Priority: Minor
• Resolution: Fixed
• Fix Version/s: 3.1.0
• Component/s: election
• Assignee: Ivan Andika
• Reporter: Ivan Andika
• Created: 18/Jan/24 06:53
• Updated: 25/Jan/24 01:41
• Resolved: 24/Jan/24 17:15

Description

During pre-vote, some follower reject the PRE_VOTE request from a candidate although the candidate has the same peer ID as the current leader. 

2024-01-18 13:44:50,123 [grpc-default-executor-100] INFO org.apache.ratis.server.impl.VoteContext: e46cc30b-13ca-4778-b856-e84b0677493d@group-059247EC8137-FOLLOWER: reject PRE_VOTE from c7e3fa47-df62-4883-8d6e-50c3b6a9b94c: this server is a follower and still has a valid leader c7e3fa47-df62-4883-8d6e-50c3b6a9b94c

It might be a good idea to add another check so that if the candidate has the same peer ID as the follower's current recognized leader, we approve the PRE_VOTE request.

Note: The optimization might be marginal since recognized leader will expire after min.rpc.timeout (150ms) anyway.

 

Issue Links

• relates to: RATIS-1265 Fix leader election with priority too slow
• links to: GitHub Pull Request #1024