Mike Percy created KUDU-2245:
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Summary: Leadership transfer (graceful step down)
Key: KUDU-2245
URL: https://issues.apache.org/jira/browse/KUDU-2245
Project: Kudu
Issue Type: Improvement
Components: consensus
Reporter: Mike Percy
Leadership transfer, also referred to as graceful leader step down, is a
concept from the Raft dissertation (Section 3.10: Leadership transfer
extension) where a leader can select a replica to "take over" as leader, and
gracefully transfer leadership to that node by engineering an election in which
that node is highly likely to win. This minimizes the period in a leadership
change during which there is no recognized leader, and therefore minimizes
latency spikes during a leader change.
This feature can be useful when the leader replica should be removed from the
tablet configuration. This can happen when the tablet server running the leader
replica is being decommissioned, or in the case of tablet replica rebalancing
where the tablet server hosting the leader replica can be considered overloaded.
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