[jira] [Commented] (KAFKA-10090) Misleading warnings: The configuration was supplied but isn't a known config

["Robert Wruck (Jira)" <ji...@apache.org>]

    [ https://issues.apache.org/jira/browse/KAFKA-10090?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=17124823#comment-17124823 ] 

Robert Wruck commented on KAFKA-10090:
--------------------------------------

The "new HashMap" leak was introduced by KAFKA-7588.

> Misleading warnings: The configuration was supplied but isn't a known config
> ----------------------------------------------------------------------------
>
>                 Key: KAFKA-10090
>                 URL: https://issues.apache.org/jira/browse/KAFKA-10090
>             Project: Kafka
>          Issue Type: Improvement
>          Components: clients
>    Affects Versions: 2.5.0
>            Reporter: Robert Wruck
>            Priority: Major
>
> In our setup (using Spring cloud stream Kafka binder), we see log messages like:
>  
> {{The configuration 'ssl.keystore.password' was supplied but isn't a known config}}
>  
> logged by org.apache.kafka.clients.admin.AdminClientConfig. The Kafka binder actually uses SSL and security.protocol is set to SSL.
> Looking through the code, a few things seem odd:
>  * The log message says "isn't a known config" but that's not true. It is *known*, i.e. defined in ConfigDef, but not *used*.
>  * The method for detecting whether a config is actually *used* is not complete. ChannelBuilders.channelBuilderConfigs() for example extracts the configs to use for the created channel builder using *new HashMap(config.values())* thus *get()* won't mark a config as used anymore.
>  



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