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https://issues.apache.org/jira/browse/HADOOP-4757?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12837194#action_12837194
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Michal Podsiadlowski commented on HADOOP-4757:
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If I may put my two cents in, my wish would be to *remove totally all log4j
config files from jars*. When using hadoop-core.jar as client library in
webserver environment it can screw all loging you have by overriding rootLogger
as it did for us. Please consider it as this can cause problems for others as
well.
> Replace log4j.properties with log4j.xml
> ---------------------------------------
>
> Key: HADOOP-4757
> URL: https://issues.apache.org/jira/browse/HADOOP-4757
> Project: Hadoop Common
> 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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