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https://issues.apache.org/jira/browse/LOG4J2-1733?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15834742#comment-15834742
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Mikael Ståldal commented on LOG4J2-1733:
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Yes, but that won't work in this case since you get the exception in an
asynchronous callback from the Kafka client library we use. The exception is
not actually thrown, just reported in a callback. We get the exception in an
other thread, probably after the {{Appender.append(LogEvent)}} method has
returned.
> Add SyncSend attribute to KafkaAppender (as in KafkaLog4jAppender)
> ------------------------------------------------------------------
>
> Key: LOG4J2-1733
> URL: https://issues.apache.org/jira/browse/LOG4J2-1733
> Project: Log4j 2
> Issue Type: Improvement
> Components: Appenders
> Affects Versions: 2.5
> Environment: Kafka 0.10.1.0
> Reporter: Vincent Tieleman
> Assignee: Mikael Ståldal
> Fix For: 2.8
>
>
> The KafkaLog4jAppender (shipped with Kafka and usable with log4j), has a
> syncsend property that improves performance significantly by not blocking a
> send to Kafka. I've tried many other configuration settings and setups, but
> find that none of these approaches improved the logging performance to Kafka
> as significantly as setting the syncsend property to false.
> Unfortunately, the syncsend property is not supported by the KafkaAppender
> shipped with log4j2 and the KafkaLog4jAppender only supports log4j, so I am
> stuck with forking the code and making the change myself.
> Could you please introduce this property in the KafkaAppender in log4j2?
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