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https://issues.apache.org/jira/browse/KAFKA-7134?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16558325#comment-16558325
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Attila Sasvari commented on KAFKA-7134:
---------------------------------------
[~venkatpotru] please note if the underlying producer cannot connect to a Kafka
broker (because the broker is not running), {{send()}} will fail and throw a
{{TimeoutException}}. The producer will notice it and tries to log it:
https://github.com/apache/kafka/blob/1d9a427225c64e7629a4eb2e2d129d5551185049/clients/src/main/java/org/apache/kafka/clients/producer/KafkaProducer.java#L876
However, if the {{rootLogger}} in {{log4j.properties}} is set to the
{{KafkaLog4jAppender}}, it will try to log this message and send it to Kafka,
and it creates an infinite loop.
> KafkaLog4jAppender - Appender exceptions are propagated to caller
> -----------------------------------------------------------------
>
> Key: KAFKA-7134
> URL: https://issues.apache.org/jira/browse/KAFKA-7134
> Project: Kafka
> Issue Type: Bug
> Components: clients
> Reporter: venkata praveen
> Assignee: Andras Katona
> Priority: Major
>
> KafkaLog4jAppender exceptions are propagated to caller when Kafka is
> down/slow/other, it may cause the application crash. Ideally appender should
> print and ignore the exception
> or should provide option to ignore/throw the exceptions like
> 'ignoreExceptions' property of
> https://logging.apache.org/log4j/2.x/manual/appenders.html#KafkaAppender
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