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https://issues.apache.org/jira/browse/LOG4J2-1824?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15894251#comment-15894251
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Mikael Ståldal commented on LOG4J2-1824:
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There is another problem with the Kafka client library we are using. If you
look at {{KafkaManager.send()}}, it needs to allocate a new ProducerRecord each
time.
As long as that's the case, I don't see much point in using the Encoder API in
KafkaAppender/KafkaManager.
> (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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