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https://issues.apache.org/jira/browse/KAFKA-5514?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=18041970#comment-18041970
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Evan Zhou commented on KAFKA-5514:
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Closing as this was fixed in KAFKA-19213, and there are [plans to propose a
KIP|https://github.com/apache/kafka/pull/20134#issuecomment-3057714702] to
deprecate the use of {{Properties}}.
> KafkaConsumer ignores default values in Properties object because of
> incorrect use of Properties object.
> --------------------------------------------------------------------------------------------------------
>
> Key: KAFKA-5514
> URL: https://issues.apache.org/jira/browse/KAFKA-5514
> Project: Kafka
> Issue Type: Bug
> Components: clients
> Affects Versions: 0.10.2.1
> Reporter: Geert Schuring
> Priority: Major
>
> When setting default values in a Properties object the KafkaConsumer ignores
> these values because the Properties object is being treated as a Map. The
> ConsumerConfig object uses the putAll method to copy properties from the
> incoming object to its local copy. (See
> https://github.com/apache/kafka/blob/trunk/clients/src/main/java/org/apache/kafka/clients/consumer/ConsumerConfig.java#L471)
> This is incorrect because it only copies the explicit properties and ignores
> the default values also present in the properties object. (Also see:
> https://stackoverflow.com/questions/2004833/how-to-merge-two-java-util-properties-objects)
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