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https://issues.apache.org/jira/browse/KAFKA-7588?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16806908#comment-16806908
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Rajini Sivaram commented on KAFKA-7588:
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[~mimaison] Are you planning to submit a PR for this? I was interested in 
custom configs in callback handlers, but as you said, it will be good to do 
this consistently for all configurables. Thanks.

> Rationalize configurations passed to pluggable APIs
> ---------------------------------------------------
>
>                 Key: KAFKA-7588
>                 URL: https://issues.apache.org/jira/browse/KAFKA-7588
>             Project: Kafka
>          Issue Type: Improvement
>            Reporter: Mickael Maison
>            Assignee: Mickael Maison
>            Priority: Major
>
> There are a lot of extensions points both on the client and server sides. 
> Most of these pluggable APIs are configurable but the configurations they 
> receive are not the same.
> For example, Serializers, Deserializers, Partitioners, Assignors, 
> QuotaCallbacks are passed config.originals(). On the other hand LoginModules, 
> PrincipalBuilders and AuthenticationCallbackHandlers are passed 
> config.values().
> In practice, having access to originals() is nice as it allows to use custom 
> configurations by simply adding it to the client/server configuration.



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