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https://issues.apache.org/jira/browse/HADOOP-13921?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16207041#comment-16207041
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Zhiyuan Yang commented on HADOOP-13921:
---------------------------------------

[~busbey] That helps to some extent, but I don't have confidence that people 
will always read the doc. The best way to let people notice is to break their 
code as early as possible. Otherwise rule without enforcement doesn't really 
make difference.

> 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
>             Fix For: 3.0.0-alpha4
>
>         Attachments: HADOOP-13921.0.patch, HADOOP-13921.1.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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