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https://issues.apache.org/jira/browse/HADOOP-4757?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12652922#action_12652922
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Tsz Wo (Nicholas), SZE commented on HADOOP-4757:
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> Given that this patch is not backwards compatible, its inclusion may not ever 
> happen.

Given the recent proposal of Hadoop 1.0 and issues like HADOOP-4631, 
HADOOP-4044, etc., being backward incompatible may be okay.  It is more 
important to have a good design.  I guess this one may happens after 0.20.

> Replace log4j.properties with log4j.xml
> ---------------------------------------
>
>                 Key: HADOOP-4757
>                 URL: https://issues.apache.org/jira/browse/HADOOP-4757
>             Project: Hadoop Core
>          Issue Type: Improvement
>            Reporter: Alex Loddengaard
>            Assignee: Alex Loddengaard
>            Priority: Minor
>         Attachments: log4j_xml_config.patch, log4j_xml_config_v2.patch
>
>
> Certain log4j features are not configurable via the log4j.properties file, 
> not to mention the log4j.properties file is messy.  For this reason, we 
> should transition to a XML file to configure log4j.  The .properties vs. .xml 
> argument has only come up in HADOOP-211, where the XML configuration was 
> vetoed for Tomcat integration issues.

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