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https://issues.apache.org/jira/browse/NIFI-2515?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15412083#comment-15412083
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Joseph Witt commented on NIFI-2515:
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I don't understand the statements made here. Kafka, just like NiFi at a
fundamental level store bags of bits. Kafka's client API allows key and value
serializers to be set. NiFi's extension API for processors allows them to
understand and honor any needed serialization/deserialization. There needs to
be more discussion here.
> Setting key.serializer in publish kafka leads to
> org.apache.kafka.common.errors.SerializationException
> ------------------------------------------------------------------------------------------------------
>
> Key: NIFI-2515
> URL: https://issues.apache.org/jira/browse/NIFI-2515
> Project: Apache NiFi
> Issue Type: Bug
> Components: Extensions
> Affects Versions: 1.0.0-Beta
> Reporter: Arpit Gupta
> Assignee: Oleg Zhurakousky
> Priority: Minor
> Fix For: 1.0.0, 0.8.0
>
>
> If one sets key.serializer in the publish kafka processor we see error
> {code}
> 4895-9b14-9e8b1d88755e}, body={topics=[putMessages-83cf2948-b110-2016-08-07
> 17:11:56,191 ERROR [Timer-Driven Process Thread-7]
> o.a.n.p.kafka.pubsub.PublishKafka
> PublishKafka[id=65fd2baf-0156-1000-ffff-fffff6bf89be]
> PublishKafka[id=65fd2baf-0156-1000-ffff-fffff6bf89be] failed to process due
> to org.apache.kafka.common.errors.SerializationException: Can't convert key
> of class [B to class org.apache.kafka.common.serialization.IntegerSerializer
> specified in key.serializer; rolling back session:
> org.apache.kafka.common.errors.SerializationException: Can't convert key of
> class [B to class org.apache.kafka.common.serialization.IntegerSerializer
> specified in key.serializer
> {code}
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