[PR] Mirror data to LSO for transaction data [kafka]

["showuon (via GitHub)" <gi...@apache.org>]

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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Re: [PR] Mirror data to LSO for transaction data [kafka]

["showuon (via GitHub)" <gi...@apache.org>]

showuon closed pull request #20545: Mirror data to LSO for transaction data
URL: https://github.com/apache/kafka/pull/20545


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