[jira] [Created] (KAFKA-9768) rest.advertised.listener configuration is not handled properly by the worker

["Chris Egerton (Jira)" <ji...@apache.org>]

Chris Egerton created KAFKA-9768:
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             Summary: rest.advertised.listener configuration is not handled properly by the worker
                 Key: KAFKA-9768
                 URL: https://issues.apache.org/jira/browse/KAFKA-9768
             Project: Kafka
          Issue Type: Bug
          Components: KafkaConnect
            Reporter: Chris Egerton
            Assignee: Chris Egerton


The {{rest.advertised.listener}} config can currently be set to either "http" or "https", and a listener with that protocol should be used when advertising the URL of the worker to other members of the Connect cluster.

For example, someone might configure their worker with a {{rest.listeners}} value of {{https://localhost:42069,http://localhost:4761}} and a {{rest.advertised.listener}} value of {{http}}, which should cause the worker to listen on port {{42069}} with TLS and port {{4761}} with plaintext, and advertise the URL {{http://localhost:4761}} to other workers.

However, the worker instead advertises the URL {{https://localhost:42069}} to other workers. This is because the {{RestServer}} class, which is responsible for determining which URL to advertise to other workers, simply [chooses the first listener whose name begins with the protocol|https://github.com/apache/kafka/blob/0f48446690e42b78a9a6b8c6a9bbab9f01d84cb1/connect/runtime/src/main/java/org/apache/kafka/connect/runtime/rest/RestServer.java#L422] specified in the {{rest.advertised.listener}} config.

This breaks because "http" is a prefix of "https", so if the advertised listener is "http" but the first listener that's found starts with "https://", that listener will still be chosen.



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