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This is a dynamic configuration, so it can be enabled at any point during the mirroring lifecycle. If it is enabled before mirroring starts, all records are guaranteed to be consistent between the two clusters, even if an ULE occurs. If it is enabled when mirroring is already running, only records produced after the next LME log truncation are guaranteed to be consistent.If some replicas cannot catch up with the leader during LME truncation due to slow network, disk issues, or other failures, the mirror partition moves to the FAILED state. In this case, users have to manually resolve the underlying issue or reassign the partition replicas to healthy brokers, and then restart mirroring.

Leader Epoch Invariant

Cluster mirroring enforces the invariant that the destination leader epoch is always greater than or equal to the source leader epoch (DLE >= SLE). This invariant is required to prevent a liveness problem in destination consumers.

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