TaiJuWu commented on PR #18386:
URL: https://github.com/apache/kafka/pull/18386#issuecomment-2583859007
We are testing **downgrade** from 4.0 to 3.3 and it **ONLY** work for single
folder but in KRAFT mode it should be three folders.
The error throw
```
kafka.common.InconsistentBrokerMetadataException: BrokerMetadata is not
consistent across log.dirs. This could happen if multiple brokers shared a log
directory (log.dirs) or partial data was manually copied from another broker.
Found:
- /mnt/kafka/kafka-metadata-logs -> {node.id=3001,
directory.id=hqW-A8W0pbE8dJmM2otDPQ, version=1,
cluster.id=I2eXt9rvSnyhct8BYmW6-w}
- /mnt/kafka/kafka-data-logs-2 -> {node.id=3001,
directory.id=nbiO8yKUacnyIijAkoFcFg, version=1,
cluster.id=I2eXt9rvSnyhct8BYmW6-w}
- /mnt/kafka/kafka-data-logs-1 -> {node.id=3001,
directory.id=2-xUs6eYlJtkVUcl6lJmtQ, version=1,
cluster.id=I2eXt9rvSnyhct8BYmW6-w}
```
What https://github.com/apache/kafka/pull/13130 do is split ZK mode and
KRAFT mode, and if we work on KRAFT mode we only check clusterID and nodeID to
avoid compatibility issue.
That why I said the only solution is back port this PR to 3.3, does it make
sense?
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