[v24.1.x] Fixed possible log discrepancy when using forced reconfiguration #18835
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(cherry picked from commit d4efd13)
Changed the way how Redpanda raft handles force reconfigurations. Instead of appending configuration to the log we keep a volatile in memory override for the configuration that was forced. The override is dropped whenever a node receives different configuration. This approach allow us to avoid discrepancies as not data are appended to the log without the active leader. Signed-off-by: Michał Maślanka <michal@redpanda.com> (cherry picked from commit 01bef11)
Signed-off-by: Michał Maślanka <michal@redpanda.com> (cherry picked from commit 640d048)
Added a check in `cluster::controller_backend` validating if configuration override has been reset before trying to finish the update. The dependency is already there as backend is waiting for the leader to be elected and confirmed however it is easier to read when the dependency is explicitly expressed Signed-off-by: Michał Maślanka <michal@redpanda.com> (cherry picked from commit ac67ca3)
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Jun 6, 2024
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Backport of PR #18153
Fixes: #18834,