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https://issues.apache.org/jira/browse/HADOOP-6884?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12898967#action_12898967
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Steve Loughran commented on HADOOP-6884:
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-1 to ASM-style work as it just complicates build/test cycles
-0 to SLF4J. I don't see the point. I use commons-logging as the front end with 
either Log4J or other tools as the back end.

Now, we could improve commons-logging to add varargs...

> Add LOG.isDebugEnabled() guard for each LOG.debug("...")
> --------------------------------------------------------
>
>                 Key: HADOOP-6884
>                 URL: https://issues.apache.org/jira/browse/HADOOP-6884
>             Project: Hadoop Common
>          Issue Type: Improvement
>    Affects Versions: 0.22.0
>            Reporter: Erik Steffl
>            Assignee: Erik Steffl
>             Fix For: 0.22.0
>
>         Attachments: HADOOP-6884-0.22-1.patch, HADOOP-6884-0.22.patch
>
>
> Each LOG.debug("...") should be executed only if LOG.isDebugEnabled() is 
> true, in some cases it's expensive to construct the string that is being 
> printed to log. It's much easier to always use LOG.isDebugEnabled() because 
> it's easier to check (rather than in each case reason whether it's necessary 
> or not).

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