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https://issues.apache.org/jira/browse/KAFKA-1136?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13829596#comment-13829596
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Joel Koshy commented on KAFKA-1136:
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Seems reasonable to me - we can do this on trunk.
> Add subAppend in Log4jAppender for generic usage
> ------------------------------------------------
>
> Key: KAFKA-1136
> URL: https://issues.apache.org/jira/browse/KAFKA-1136
> Project: Kafka
> Issue Type: Improvement
> Components: producer
> Reporter: Jie Huang
> Assignee: Jun Rao
> Priority: Trivial
> Attachments: KAFKA-1136.diff
>
>
> KafkaLog4jAppender is quite useful for us to send our log4j logs to the Kafka
> system with ease. However, according to our experience, it is not so that
> convenient to customize the message content before emitting it out.
> Sometimes, we need to decorate the message like adding more system level
> information before passing it to the producer. I wonder if it is possible to
> add one subAppend() function, like org.apache.log4j.WriterAppender does.
> Thus, the end user can customize their message by overwriting the subAppend()
> only in their own hierarchy class, and re-use all the rest part.
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