[jira] [Created] (KAFKA-5514) KafkaConsumer ignores default values in Properties object because of incorrect use of Properties object.

["Geert Schuring (JIRA)" <ji...@apache.org>]

Geert Schuring created KAFKA-5514:
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             Summary: 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


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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