[server] Reconcile divergent replica logs using leader epochs - #4273
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Track durable leader epoch boundaries and exchange optional epoch metadata during replication to reconcile divergent tails after leader migration. Preserve legacy replication compatibility and support a dynamically configurable, default-enabled epoch mode. Cover divergence, mixed-mode replication, dynamic configuration changes, and remote recovery.
Preserve durable epoch boundaries on restart and follower progress on leader reelection. Correct the test endpoint leader identity and verify follower high watermark convergence. Regenerate Rust protobuf bindings and keep scanner requests free of replication-only epoch metadata.
Propagate append IOExceptions to the replica fatal error handler after invalidating epoch history. Retry remote segment cleanup when the high watermark reaches the committed remote boundary. Exercise ISR recovery through a real follower restart without creating inconsistent leader epochs.
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Track durable leader epoch boundaries and exchange optional epoch metadata during replication to reconcile divergent tails after leader migration.
Preserve legacy replication compatibility and support a dynamically configurable, default-enabled epoch mode. Cover divergence, mixed-mode replication, dynamic configuration changes, and remote recovery.
Purpose
Linked issue: close #4269
Brief change log
Tests
API and Format
Documentation