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https://issues.apache.org/jira/browse/KAFKA-2289?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=14594089#comment-14594089
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Henning Schmiedehausen commented on KAFKA-2289:
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Pull request with a fix is at https://github.com/apache/kafka/pull/71
> KafkaProducer logs erroneous warning on startup
> -----------------------------------------------
>
> Key: KAFKA-2289
> URL: https://issues.apache.org/jira/browse/KAFKA-2289
> Project: Kafka
> Issue Type: Bug
> Components: clients
> Affects Versions: 0.8.2.1
> Reporter: Henning Schmiedehausen
> Priority: Trivial
>
> When creating a new KafkaProducer using the
> KafkaProducer(KafkaConfig, Serializer<K>, Serializer<V>) constructor, Kafka
> will list the following lines, which are harmless but are still at WARN level:
> WARN [2015-06-19 23:13:56,557]
> org.apache.kafka.clients.producer.ProducerConfig: The configuration
> value.serializer = class XXXX was supplied but isn't a known config.
> WARN [2015-06-19 23:13:56,557]
> org.apache.kafka.clients.producer.ProducerConfig: The configuration
> key.serializer = class YYYY was supplied but isn't a known config.
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