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https://issues.apache.org/jira/browse/HADOOP-13921?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16020243#comment-16020243
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Robert Kanter commented on HADOOP-13921:
----------------------------------------

[~busbey], can you add details on the incompatible change to the release notes 
field?  I'm not sure I follow exactly what it is so far.  Is it basically that 
we're removing log4j from mapred client, so if users need log4j they'll have to 
manually add it from now on?

> Remove Log4j classes from JobConf
> ---------------------------------
>
>                 Key: HADOOP-13921
>                 URL: https://issues.apache.org/jira/browse/HADOOP-13921
>             Project: Hadoop Common
>          Issue Type: Sub-task
>          Components: conf
>    Affects Versions: 3.0.0-alpha2
>            Reporter: Sean Busbey
>            Assignee: Sean Busbey
>            Priority: Critical
>         Attachments: HADOOP-13921.0.patch
>
>
> Replace the use of log4j classes from JobConf so that the dependency is not 
> needed unless folks are making use of our custom log4j appenders or loading a 
> logging bridge to use that system.



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