[v23.3.x] Use confirmed term as a source of leader epoch #16573
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A confirmed term is used to determine if the state of a replica is up to date after the leader election. Only after the confirmed term is equal to the current term one can reason about the Raft group state. On the leader the confirmed term is updated after first successful replication of a batch subsequent to a leader election. After the replication succeed leader is guaranteed to have up to date committed and visible offsets. On the follower the confirmed term is updated only when an append entries request from the current leader may be accepted and follower may return success. Signed-off-by: Michal Maslanka <michal@redpanda.com> (cherry picked from commit 6037462)
A leader epoch is used by Kafka clients to determine if a replica is up to date with the leader and to detect truncation. The leader epoch differs from Raft term as the term is updated when leader election starts. Whereas the leader epoch is updated after the state of the replica is determined. Therefore the leader epoch uses confirmed term instead of the simple term which is incremented every time the leader election starts. Signed-off-by: Michal Maslanka <michal@redpanda.com> (cherry picked from commit e746f79)
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mmaslankaprv
approved these changes
Feb 20, 2024
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Backport of PR #16560