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https://issues.apache.org/jira/browse/KAFKA-1084?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13795202#comment-13795202
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Francois Saint-Jacques commented on KAFKA-1084:
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I believe a warning will still get logged for unknown string properties since
the patch in KAFKA-1049 doesn't touch the validate function.
> Validate properties for custom serializers
> ------------------------------------------
>
> Key: KAFKA-1084
> URL: https://issues.apache.org/jira/browse/KAFKA-1084
> Project: Kafka
> Issue Type: Improvement
> Reporter: Francois Saint-Jacques
> Priority: Minor
> Attachments: validate-external-properties.patch
>
>
> We use specifics encoder/decoder for our producers/consumers, they get
> correctly initialized by the Producer/Consumer. The only downside is the
> validate() function of VerifiableProperties that pollutes our log stream.
> This patch allows custom serializers keys to validate correctly if they begin
> with the "external" prefix, for example:
> external.my.encoder.param=true
> will not raise a WARN.
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