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https://issues.apache.org/jira/browse/HADOOP-14587?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16062991#comment-16062991
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wenxin he commented on HADOOP-14587:
------------------------------------

001.patch

# {{org.apache.log4j.Level}} in hadoop-auth leaves unchanged for hadoop-auth 
can not depend on GenericTestUtils in hadoop-common.
# A helper method added in GenericTestUtils to facilitate the migration. 
After moving commons logging APIs over to slf4j, this method can be removed 
without any changes.
# {{org.slf4j.event.Level}} has no "ALL" value, so I mapped 
{{org.apache.log4j.Level.ALL}} to {{org.slf4j.event.Level.TRACE}} which is the 
lowest priority.
# About replacing {{org.apache.log4j.Logger.getRootLogger()}}
In {{TestGroupFallback}}, I found 
{{org.slf4j.LoggerFactory.getLogger(Logger.ROOT_LOGGER_NAME)}} is not 
equivalent to {{org.apache.log4j.Logger.getRootLogger()}}.
so I used {{org.slf4j.LoggerFactory.getLogger("org")}} to replace 
{{org.apache.log4j.Logger.getRootLogger()}} and the tests output is the same 
with original.
I am not sure whether it's OK or not?

> Use GenericTestUtils.setLogLevel when available in hadoop-common
> ----------------------------------------------------------------
>
>                 Key: HADOOP-14587
>                 URL: https://issues.apache.org/jira/browse/HADOOP-14587
>             Project: Hadoop Common
>          Issue Type: Sub-task
>            Reporter: wenxin he
>            Assignee: wenxin he
>         Attachments: HADOOP-14587.001.patch
>
>
> Based on Brahma's comment in HADOOP-14296, it's better to use 
> GenericTestUtils.setLogLevel as possible to make the migration easier.



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