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Offset Translation

Lossy, requires remapping, causes reprocessing overhead

None needed - , offsets preserved exactly

Metadata Sync

Requires separate connector configuration (MirrorSourceConnector, MirrorCheckpointConnector)

Automatic (topics, configs, consumer groups, ACLs)

Transactional Topics

Markers copied as regular records, incomplete transactions possible during replication

Markers mirrored, LSO truncation ensures consistency before failover

Topic Write Protection

Not supported (mirror topics always writable)

Read-only enforcement during mirroring, writable only after explicit failover

Tiered Storage

Fetches from broker (which reads from remote storage)

Not initially supported (future work)

Active-Active

Supported via topic prefixing and cycle detection

Not supported (read-only enforcement prevents cycles)

Share Groups

Not supported

Failback

Full re-mirror from offset 0

Delta sync using LastMirroredOffset

Topic Name Preservation

No - , destination topics prefixed with source cluster alias (e.g., source.topic-name)

Yes - , same topic name as source

Topic ID Preservation

No - , destination gets new topic ID

Yes - : same topic ID as source