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https://issues.apache.org/jira/browse/HADOOP-12956?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16266158#comment-16266158
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Ralph Goers commented on HADOOP-12956:
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The above patch should simplify some of the challenges other projects have in
moving to Log4j 2 as Hadoop won't require Log4j 1's AppenderSkeleton unless
Log4j 1 is being used. It also eliminates the need to exclude the log4j 1.x and
slf4j-log4j12 jars since they are now optional.
> Inevitable Log4j2 migration via slf4j
> -------------------------------------
>
> Key: HADOOP-12956
> URL: https://issues.apache.org/jira/browse/HADOOP-12956
> Project: Hadoop Common
> Issue Type: Improvement
> Reporter: Gopal V
> Assignee: Haohui Mai
>
> {{5 August 2015 --The Apache Logging Services™ Project Management Committee
> (PMC) has announced that the Log4j™ 1.x logging framework has reached its end
> of life (EOL) and is no longer officially supported.}}
> https://blogs.apache.org/foundation/entry/apache_logging_services_project_announces
> A whole framework log4j2 upgrade has to be synchronized, partly for improved
> performance brought about by log4j2.
> https://logging.apache.org/log4j/2.x/manual/async.html#Performance
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