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The goal here is to make sure that any existing topic, without any namespace, continues to work as expected. All topics under /broker/topics will be part of default namespace, i.e., "". Any topic created without specifying a namespace will be part of the default namespace. As long as users start specifying namespaces in their request or cli commands, things should work just as before. 

Handling Acls Inheritance

Handling Configs Inheritance

Pros

1. Will not change existing behavior.
2. No impact on upgrades.

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