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https://issues.apache.org/jira/browse/KAFKA-7509?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=17519748#comment-17519748
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Chris Egerton commented on KAFKA-7509:
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Thanks [~mjsax]. It seems like the root causes of this issue and KAFKA-6793 are
actually quite different and, although we shouldn't implement a solution for
one that is wholly incompatible with a solution for the other, it may not be
necessary to address both at the same time.
I'd be very curious to see if there's an example of a situation where it's
unavoidable that unrecognized property warnings get logged by Kafka Streams,
even when fully leveraging the namespacing mechanisms provided by the
{{{}producer.{}}}, {{{}main.consumer.{}}}, etc. prefixes.
I've updated [https://github.com/apache/kafka/pull/11986] to remove any changes
to the public Java clients API, so it's ready for review if anyone wants to
take a look.
> 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: clients, KafkaConnect
> Affects Versions: 0.10.2.0
> Reporter: Randall Hauch
> Assignee: Chris Egerton
> 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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