showuon opened a new pull request, #20545:
URL: https://github.com/apache/kafka/pull/20545
Mirror data to LSO for transaction data
After mirroring the topic from the source, check the logs in the destination
cluster with `isolationLevel=read_committed`:
```
bin/kafka-topics.sh --createMirror --topic quickstart-events
--bootstrap-server localhost:9094 --remote-bootstrap-server localhost:9092
--topic-id 4bF1V1ljTqGRbls7tHFduA
```
```
[2025-09-17 20:48:43,614] INFO [ReplicaFetcher replicaId=4, leaderId=2,
fetcherId=0, readOnly=true] !!! Sending fetch request (type=FetchRequest,
replicaId=-1, maxWait=1000, minBytes=1, maxBytes=10485760,
fetchData={quickstart-events-0=PartitionData(topicId=4bF1V1ljTqGRbls7tHFduA,
fetchOffset=0, logStartOffset=0, maxBytes=1048576,
currentLeaderEpoch=Optional[0], lastFetchedEpoch=Optional[0])},
isolationLevel=read_committed, removed=, replaced=,
metadata=(sessionId=INVALID, epoch=INITIAL), rackId=)
(kafka.server.ReplicaFetcherThread)
```
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