| Characteristic | Kafka-Pixy | Strimzi Bridge | Confluent REST Proxy | ONAP Message Router | Remarks |
|---|---|---|---|---|---|
| At least once semantics | Yes | Yes | Yes | No | MAJOR requirement for stability and robustness |
| Scale out without individual exposure to proxy server | No | No | No | No | |
| Kafka Admin interface | No | No | Yes | Limited (can create topics) | Not an issue if we use the K8S Operator |
| Filters | No | No | No | Limited (JSON only) | |
| Group send / recieve | No | Yes | Yes | Limited (no partition keys) | |
| Client abstraction from Kafka | Limited | No | No | Limited | |
| Multiple Kafka clusters | Yes | No | No | No | |
| Secure comms (front facing) | Yes | No | Yes | Yes | |
| Authentication (front facing) | No | No | Yes | Yes | |
| Authorization (front facing) | No | No | No (can be licensed) | Limited (depends on AAF) | |
| Client Kafka config params | No | Yes | Yes | No | |
| Transparent scale out of consumers | No | No | No | No | |
| "ONAP Compliant" Interface | No | No | No | Yes (by definition) | |
| Code maturity / activity | Stable, low activity in last year | High quality, actively maintained | High quality, actively maintained | Outdated codebase with significant technical issues | |
| Secure communication (Kafka) | Yes | Yes | Yes | Yes | |
| Authentication (Kafka) | Limited | Yes | Limited | Limited |
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