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https://issues.apache.org/jira/browse/LOG4J2-1824?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15894656#comment-15894656
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Matt Sicker commented on LOG4J2-1824:
-------------------------------------

Then it seems the only way to implement this would be via changes in 
kafka-clients or by using a different Kafka client library entirely.

> (GC) Avoid allocating temporary objects in KafkaAppender
> --------------------------------------------------------
>
>                 Key: LOG4J2-1824
>                 URL: https://issues.apache.org/jira/browse/LOG4J2-1824
>             Project: Log4j 2
>          Issue Type: Improvement
>          Components: Appenders
>            Reporter: Matt Sicker
>
> Due to API limitations in kafka-clients, log messages must be encoded into 
> byte arrays rather than directly into ByteBuffers via 
> {{Encoder<LogEvent>}}-enhanced layouts. I've opened up KAFKA-4802 to get 
> support on the client side for not converting the provided ByteBuffers back 
> into a byte array, but in the meantime, KafkaAppender and KafkaManager can be 
> enhanced to use the Encoder API.



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