[v24.1.x] Transfer leadership before stepping down after reconfiguration #22769
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Added a missing trigger of Raft leadership notification after stepping down when a leader node is not longer part of raft group configuration. Signed-off-by: Michał Maślanka <michal@redpanda.com> (cherry picked from commit 8f4db30)
When a node currently being a raft group leader is not a part of new configuration it must step down and become a follower. When stepping down a leader stops sending heartbeats to the followers allowing them to trigger election. The election starts only after an election timeout elapsed on on of the followers. This makes the whole process slow and during the whole time clients can not write and read from the raft group as it is leaderless. To address this issue a new method of step down was introduced. The new stepdown implementation which is going to be used for reconfiguration requests one of the followers to timeout immediately and trigger leader election. This speeds up the whole process and makes it much less disruptive as the stepdown is now comparable to leadership transfer. Signed-off-by: Michał Maślanka <michal@redpanda.com> (cherry picked from commit 9f7a508)
Added a test validating if a leader election caused by removing leader from the replica set takes a comparable amount of time to the leadership transfer. Signed-off-by: Michał Maślanka <michal@redpanda.com> (cherry picked from commit 9c58109)
ztlpn
approved these changes
Aug 7, 2024
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Backport of PR #19966