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https://issues.apache.org/jira/browse/RATIS-2311?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Tsz-wo Sze reassigned RATIS-2311:
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Assignee: Tsz-wo Sze
> Allow TransferLeadership#isFollowerUpToDate to wait for appliedIndex
> --------------------------------------------------------------------
>
> Key: RATIS-2311
> URL: https://issues.apache.org/jira/browse/RATIS-2311
> Project: Ratis
> Issue Type: Improvement
> Components: Leader
> Reporter: Ivan Andika
> Assignee: Tsz-wo Sze
> Priority: Major
>
> Currently TransferLeadership#isFollowerUpToDate only waits for the up-to-date
> matchIndex before triggering election on the target Ratis server.
> However, if the target Ratis server appliedIndex is way below the matchIndex,
> once the Ratis server is promoted to a leader, it might take a while for it
> to catch up to the current appliedIndex and acknowlegding the requests. This
> can have a noticeable effect on the latency and throughput of the Raft group.
> We might make the transfer leadership check to be more strict by ensuring
> that leader and follower appliedIndex gap is within a certain acceptable
> threshold (e.g 10,000) so that the leader catch up would be less noticeable.
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