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https://issues.apache.org/jira/browse/KAFKA-16604?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=17842031#comment-17842031
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Chia-Ping Tsai commented on KAFKA-16604:
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{quote}
If we want to prevent bugs like we saw in KAFKA-16592, one alternative is to 
add a builder class for the ConfigKey class. This would allow us to add new 
fields to the ConfigKey class without having to add new (public) constructors, 
or alter existing ones.
{quote}

I love build pattern, but there are already a lot of helper methods - "define" 
- which allows user to create ConfigKey object with fewer arguments. We have to 
deprecate all "define" functions to encourage to use new builder, and that 
means more breaking changes.

> Deprecate ConfigDef.ConfigKey constructor from public APIs
> ----------------------------------------------------------
>
>                 Key: KAFKA-16604
>                 URL: https://issues.apache.org/jira/browse/KAFKA-16604
>             Project: Kafka
>          Issue Type: Improvement
>            Reporter: Sagar Rao
>            Assignee: Sagar Rao
>            Priority: Major
>
> Currently, one can create ConfigKey by either invoking the public constructor 
> directly and passing it to a ConfigDef object or by invoking the a bunch of 
> define methods. The 2 ways can get confusing at times. Moreover, it could 
> lead to errors as was noticed in KAFKA-16592
> We should ideally have only 1 way exposed to the users which IMO should be to 
> create the objects only through the exposed define methods. This ticket is 
> about marking the public constructor of ConfigKey as Deprecated first and 
> then making it private eventually.



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