I saw this feature mentioned in the cloudera blog post: https://blog.cloudera.com/a-look-inside-kafka-mirrormaker-2/
High Throughput Identity Mirroring The batch does not need to be decompressed and compressed and deserialized and serialized if nothing had to be changed. Identity mirroring can have a much higher throughput than the traditional approach. This is another feature that will be coming soon in MM2. Is this feature already implemented in MM2? Is there a KIP or JIRA associated with the feature?