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Feature

Source Cluster Requirement

Destination Cluster Requirement

Notes

Core mirroring and failover

2.1

4.x

Kafka 4 is compatible with old clients versions up to 2.1 included.

Failback (reverse mirroring)

4.x

4.x

Requires last mirrored offset LME tracking on both sides, otherwise it will fallback and truncate to zero, effectively mirroring from scratch.

Share Groups

4.x

4.y

If the source doesn't support share groups, mirroring continues but share group offsets won't be synchronized.

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