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Solution: Use the same sentinel ID reserved for the metadata topic before its ID is known. After controller election, upon receiving the result, assign the metadata topic its unique topic ID. The ID should be written to the metadata topic, as all IDs will now be written to this topic instead of ZooKeeper.

Using a topic ID will result in a slightly smaller fetch request and likely prevent further changes. Assigning a unique ID for the metadata topic leaves the possibility for the topic to be placed in tiered storage, or used in other scenarios where topics from multiple clusters may be in one place without appending the cluster ID.

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