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https://issues.apache.org/jira/browse/KAFKA-2041?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=14393424#comment-14393424
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Tom DeVoe commented on KAFKA-2041:
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One small bug in the most recent patch you uploaded, you changed the Keyer
trait function to {{getKey}}, but did not update KafkaLog4jAppender, which
still uses the old {{key}} function. Once that was updated, the patch worked
great.
> Add ability to specify a KeyClass for KafkaLog4jAppender
> --------------------------------------------------------
>
> Key: KAFKA-2041
> URL: https://issues.apache.org/jira/browse/KAFKA-2041
> Project: Kafka
> Issue Type: Improvement
> Components: producer
> Reporter: Benoy Antony
> Assignee: Jun Rao
> Attachments: kafka-2041-001.patch, kafka-2041-002.patch
>
>
> KafkaLog4jAppender is the Log4j Appender to publish messages to Kafka.
> Since there is no key or explicit partition number, the messages are sent to
> random partitions.
> In some cases, it is possible to derive a key from the message itself.
> So it may be beneficial to enable KafkaLog4jAppender to accept KeyClass which
> will provide a key for a given message.
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