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https://issues.apache.org/jira/browse/KAFKA-3786?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15315698#comment-15315698
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Ewen Cheslack-Postava commented on KAFKA-3786:
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[~guozhang] Exactly which warnings are you referring to? The code is supposed
to be trying to track which properties are used -- whether by the parent
AbstractConfig or anything that gets passed its originals. It does that by
returning a {{RecordingMap}} when you get the original configs, and then
{{logUnused}} should not be invoked until you've passed {{originals}} or some
derivative to all child configurable classes (like serializers).
I think we may not handle the case of both a parent and child using
{{ConfigDef}}/{{AbstractConfig}}. I think for the child {{AbstractConfig}}, we
may not compute unused keys properly since it has no idea it is being passed a
{{RecordingMap}}. Is that the case you're intending to solve here?
> Avoid unused property from parent configs causing WARN entries
> --------------------------------------------------------------
>
> Key: KAFKA-3786
> URL: https://issues.apache.org/jira/browse/KAFKA-3786
> Project: Kafka
> Issue Type: Bug
> Reporter: Guozhang Wang
> Assignee: Guozhang Wang
>
> Currently the {{AbstractConfig}}'s constructor accepts the passed property
> map as well as the {{ConfigDef}}, and maintains the original map as well as
> the parsed values together. Because of it, with hierarchical config passing
> like {{StreamsConfig}}, the underlying configs will takes all the key-value
> pairs when constructed and hence cause WARNING log output.
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