[jira] [Created] (KAFKA-5061) client.id should be set for Connect producers/consumers

["Ewen Cheslack-Postava (JIRA)" <ji...@apache.org>]

Ewen Cheslack-Postava created KAFKA-5061:
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             Summary: client.id should be set for Connect producers/consumers
                 Key: KAFKA-5061
                 URL: https://issues.apache.org/jira/browse/KAFKA-5061
             Project: Kafka
          Issue Type: Bug
          Components: KafkaConnect
    Affects Versions: 0.10.2.1
            Reporter: Ewen Cheslack-Postava


In order to properly monitor individual tasks using the producer and consumer metrics, we need to have the framework disambiguate them. Currently when we create producers (https://github.com/apache/kafka/blob/trunk/connect/runtime/src/main/java/org/apache/kafka/connect/runtime/Worker.java#L362) and create consumers (https://github.com/apache/kafka/blob/trunk/connect/runtime/src/main/java/org/apache/kafka/connect/runtime/WorkerSinkTask.java#L371-L394) the client ID is not being set. You can override it for the entire worker via worker-level producer/consumer overrides, but you can't get per-task metrics.

There are a couple of things we might want to consider doing here:
1. Provide default client IDs based on the worker group ID + task ID (providing uniqueness for multiple connect clusters up to the scope of the Kafka cluster they are operating on). This seems ideal since it's a good default; however it is a public-facing change and may need a KIP. Normally I would be less worried about this, but some folks may be relying on picking up metrics without this being set, in which case such a change would break their monitoring.
2. Allow overriding client.id on a per-connector basis. I'm not sure if this will really be useful or not -- it lets you differentiate between metrics for different connectors' tasks, but within a connector, all metrics would go to a single client.id. On the other hand, this makes the tasks act as a single group from the perspective of broker handling of client IDs.



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