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https://issues.apache.org/jira/browse/KAFKA-4802?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15894657#comment-15894657
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Matt Sicker commented on KAFKA-4802:
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We also found a related issue in the inability to reuse ProducerRecord objects.
> Support direct ByteBuffer serializers/deserializers in clients
> --------------------------------------------------------------
>
> Key: KAFKA-4802
> URL: https://issues.apache.org/jira/browse/KAFKA-4802
> Project: Kafka
> Issue Type: New Feature
> Components: clients
> Reporter: Matt Sicker
>
> RecordAccumulator and Fetcher are already written to take advantage of a pool
> of ByteBuffers, but Serializer and Deserializer require you to return a byte
> array. If I have a key or value format that is better handled directly via
> ByteBuffer, the added conversion to a byte array introduces unnecessary
> garbage.
> An example use case would be in enhancing the KafkaAppender in Log4j 2 to
> support garbage free logging (or minimal garbage; I haven't really looked at
> the entire code path).
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