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https://issues.apache.org/jira/browse/KAFKA-7014?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Chia-Ping Tsai resolved KAFKA-7014.
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Resolution: Won't Fix
> Guarantee the byte buffer returned by Serializer is reusable
> ------------------------------------------------------------
>
> Key: KAFKA-7014
> URL: https://issues.apache.org/jira/browse/KAFKA-7014
> Project: Kafka
> Issue Type: Bug
> Reporter: Chia-Ping Tsai
> Priority: Minor
>
> The byte array returned by Serializer is copied to another ByteBuffer by
> KafkaProducer so the byte array is reusable actually. If kafka can guarantee
> this behavior (perhaps doc it on the Serializer), user can design the
> size-fixed message and then reuse the byte array.
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