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In the JBOD mode, a partition's data can be moved from one disk to another. The partition metadata file would be copied during this process.

Tooling

kafka-topics.sh --describe will be updated to include the topic ID in the output. A user can specify a topic name to describe with the --topic parameter, or alternatively the user can supply a topic ID with the --topic_id parameter

Migration

Upon a controller becoming active, the list of current topics is loaded from /brokers/topics/[topic]. When a topic without a topic ID is found, a UUID will be randomly generated and assigned the topic information at /brokers/topics/[topic] will be updated with the id filled and the schema version bumped to version 3.

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