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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