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By default, namespace will be empty string. All existing entities will be part of default namespace and the current storage layouts will be in accordance with the proposed storage layouts.
Pros
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- Will not change existing behavior.
- No impact on upgrades.
Cons
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- Namespace needs to be parsed out of topic names and that requires some separating string or character. We suggest to make this string configurable at cluster level with "::" as default.
- Longer topic names in requests and responses.
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