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https://issues.apache.org/jira/browse/KAFKA-7509?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16660868#comment-16660868
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Sönke Liebau commented on KAFKA-7509:
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Hi [~rhauch], wouldn't this take away the ability to pass configuration options
to custom interceptor and partitioner classes?
This is probably not something that is widely done, but I can think of a few
use cases like making a call to an external system from a partitioner and
setting the target url in configuration. Or, come to think of it, the control
center interceptors also allow some configuration parameters to be passed to
them that are not defined in ProducerConfig I think.
> Kafka Connect logs unnecessary warnings about unused configurations
> -------------------------------------------------------------------
>
> Key: KAFKA-7509
> URL: https://issues.apache.org/jira/browse/KAFKA-7509
> Project: Kafka
> Issue Type: Improvement
> Components: KafkaConnect
> Affects Versions: 0.10.2.0
> Reporter: Randall Hauch
> Assignee: Randall Hauch
> Priority: Major
>
> When running Connect, the logs contain quite a few warnings about "The
> configuration '{}' was supplied but isn't a known config." This occurs when
> Connect creates producers, consumers, and admin clients, because the
> AbstractConfig is logging unused configuration properties upon construction.
> It's complicated by the fact that the Producer, Consumer, and AdminClient all
> create their own AbstractConfig instances within the constructor, so we can't
> even call its {{ignore(String key)}} method.
> See also KAFKA-6793 for a similar issue with Streams.
> There are no arguments in the Producer, Consumer, or AdminClient constructors
> to control whether the configs log these warnings, so a simpler workaround
> is to only pass those configuration properties to the Producer, Consumer, and
> AdminClient that the ProducerConfig, ConsumerConfig, and AdminClientConfig
> configdefs know about.
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