[jira] [Assigned] (RATIS-981) Step-down stale leader in case of split-brain

["Nanda kumar (Jira)" <ji...@apache.org>]

     [ https://issues.apache.org/jira/browse/RATIS-981?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]

Nanda kumar reassigned RATIS-981:
---------------------------------

    Assignee:     (was: Nanda kumar)

> Step-down stale leader in case of split-brain
> ---------------------------------------------
>
>                 Key: RATIS-981
>                 URL: https://issues.apache.org/jira/browse/RATIS-981
>             Project: Ratis
>          Issue Type: Improvement
>            Reporter: Nanda kumar
>            Priority: Major
>
> We should make sure that the stale leader steps down to the candidate state before the next leader election.
> Proposal:
> In the heartbeat thread in the Leader node, we should check if the last response time of the follower is less than the leader election timeout. If the majority of the follower’s last response time is less than the leader election timeout, the current leader is still the active leader. Majority of the followers are heartbeating to the current leader, so there can’t be a new leader.
> If the majority of follower’s last response time is greater than the leader election timeout, the current leader should step down and become a candidate.
> With this check, we can be sure that the current leader will step down and become a candidate before the new leader election starts in case of a network partition.



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