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https://issues.apache.org/jira/browse/HADOOP-16377?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16867598#comment-16867598
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Prabhu Joseph commented on HADOOP-16377:
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Thanks [~ste...@apache.org] for reviewing the patch.

1. Have followed the imports order wherever a new import is done.
2. FileSystem uses only one slf4j LOG. Have left the other classes to use 
FileSystem.LOG as there are too many references. The subclasses and other 
classes won't be affected if they have directly used FileSystem.LOG object 
without assigning it to a commons logging Log reference variable.

> Moving logging APIs over to slf4j
> ---------------------------------
>
>                 Key: HADOOP-16377
>                 URL: https://issues.apache.org/jira/browse/HADOOP-16377
>             Project: Hadoop Common
>          Issue Type: Improvement
>            Reporter: Wei-Chiu Chuang
>            Assignee: Prabhu Joseph
>            Priority: Major
>         Attachments: HADOOP-16357-002.patch, HADOOP-16377-001.patch
>
>
> As of today, there are still 50 references to log4j1
> {code}
> $ grep -r "import org.apache.commons.logging.Log;" . |wc - l
>       50
> {code}
> To achieve the goal of HADOOP-12956/HADOOP-16206, we should invest time to 
> move them to slf4j



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