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https://issues.apache.org/jira/browse/HADOOP-7697?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13117486#comment-13117486
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Doug Cutting commented on HADOOP-7697:
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SLF4J is a successor to commons logging. It does not bind you to a particular
logging framework but is a meta logger like commons logging. It fixes some
serious problems in the architecture of Commons logging. If you just add the
slf4j-log4j.jar to your classpath then slf4j uses Log4j compatibly with
everything else in Hadoop without any extra configuration.
http://articles.qos.ch/thinkAgain.html
> Remove dependency on different version of slf4j in avro
> -------------------------------------------------------
>
> Key: HADOOP-7697
> URL: https://issues.apache.org/jira/browse/HADOOP-7697
> Project: Hadoop Common
> Issue Type: Bug
> Components: build
> Affects Versions: 0.22.0
> Reporter: Konstantin Shvachko
> Assignee: Konstantin Shvachko
> Fix For: 0.22.0
>
> Attachments: ivyXml-common.patch, ivyXml-common.patch
>
>
> Avro upgrade led to a mixture of slf4j versions. Hadoop uses slf4j 1.5.11,
> and avro brings in 1.6.1
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