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https://issues.apache.org/jira/browse/HADOOP-12956?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15209207#comment-15209207
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Gopal V commented on HADOOP-12956:
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bq. if commons-logging supports log4j2.x
LLAP moved DFSClient etc logging to log4j2 via the jcl bridge -
http://mvnrepository.com/artifact/org.apache.logging.log4j/log4j-jcl
The thing that broke however was the .properties syntax & the /logs dynamic
configuration servlet, which assumes log4j1.x
> 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
>
> {{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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