THIS IS A TEST INSTANCE. ALL YOUR CHANGES WILL BE LOST!!!!
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After considering a few approaches, listed in Rejected Alternatives section, below is what we think is the least obtrusive approach to support namespaces in Kafka. We suggest to represent namespaces at storage layer, i.e., storage layout of Zookeeper entities and logs on disk. Internal and public APIs can pass around namespaces, as part of, prepended to, topic names.
Changes in storage layouts
Following are the changes in layout structures on ZK and disks.
| Type | Existing layout | Proposed layout |
|---|---|---|
| ZK | /brokers/topics/<topic> | /brokers/topics/<namespace>/<topic> |
| ZK | /configs/<entity_name>/<entity> | /configs/<namespace>/<entity_name>/<entity> |
| ZK | /admin/delete_topics/<topic> | /admin/delete_topics/<namespace>/<topic> |
| ZK | /kafka_acls/<entity_name>/<entity> | /kafka_acls/<namespace>/<entity_name>/<entity> |
| Disk | /<log_dir>/<topic>_<partition> | /<log_dir>/namespace/<topic>_<partition> |
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