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https://issues.apache.org/jira/browse/KAFKA-1368?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16390872#comment-16390872
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Vladislav Pernin commented on KAFKA-1368:
-----------------------------------------

Log4j upgrade was needed in 2014 to be able to use more logging pattern only.

Anyway, using a generic facade like slf4j is probably a good idea.

> Upgrade log4j
> -------------
>
>                 Key: KAFKA-1368
>                 URL: https://issues.apache.org/jira/browse/KAFKA-1368
>             Project: Kafka
>          Issue Type: Improvement
>    Affects Versions: 0.8.0
>            Reporter: Vladislav Pernin
>            Assignee: Mickael Maison
>            Priority: Major
>
> Upgrade log4j to at least 1.2.16 ou 1.2.17.
> Usage of EnhancedPatternLayout will be possible.
> It allows to set delimiters around the full log, stacktrace included, making 
> log messages collection easier with tools like Logstash.
> Example : <[%d{XXXX}]...[%t] %m%throwable>%n
> <[2014-04-08 11:07:20,360] ERROR [KafkaApi-1] Error when processing fetch 
> request for partition [XXXXX,6] offset 700 from consumer with correlation id 
> 0 (kafka.server.KafkaApis)
> kafka.common.OffsetOutOfRangeException: Request for offset 700 but we only 
> have log segments in the range 16021 to 16021.
>         at kafka.log.Log.read(Log.scala:429)
>         ...
>         at java.lang.Thread.run(Thread.java:744)>



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