[jira] [Created] (RATIS-2311) Allow TransferLeadership#isFollowerUpToDate to wait for appliedIndex

["Ivan Andika (Jira)" <ji...@apache.org>]

Ivan Andika created RATIS-2311:
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             Summary: Allow TransferLeadership#isFollowerUpToDate to wait for appliedIndex
                 Key: RATIS-2311
                 URL: https://issues.apache.org/jira/browse/RATIS-2311
             Project: Ratis
          Issue Type: Improvement
            Reporter: Ivan Andika


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 leader.

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).



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