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https://issues.apache.org/jira/browse/KAFKA-4434?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15690203#comment-15690203
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Ismael Juma commented on KAFKA-4434:
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Good catch. Would you like to contribute a fix?
> KafkaProducer configuration is logged twice
> -------------------------------------------
>
> Key: KAFKA-4434
> URL: https://issues.apache.org/jira/browse/KAFKA-4434
> Project: Kafka
> Issue Type: Bug
> Components: config
> Affects Versions: 0.10.0.1
> Reporter: Ruben de Gooijer
> Priority: Minor
> Labels: newbie
> Fix For: 0.10.2.0
>
>
> The constructor of org.apache.kafka.clients.producer.KafkaProducer accepts a
> ProducerConfig which when constructed logs the configuration:
> https://github.com/apache/kafka/blob/0.10.0.1/clients/src/main/java/org/apache/kafka/common/config/AbstractConfig.java#L58
> .
> However, when the construction of KafkaProducer proceeds the provided
> ProducerConfig is repurposed and another instance is created
> https://github.com/apache/kafka/blob/0.10.0.1/clients/src/main/java/org/apache/kafka/clients/producer/KafkaProducer.java#L323
> which triggers another log with the same contents (only the clientId can
> differ in case its not supplied in the original config).
> At first sight this seems like unintended behaviour to me. At least it caused
> me to dive into it in order to verify if there weren't two producer instances
> running.
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