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https://issues.apache.org/jira/browse/HADOOP-6884?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12893258#action_12893258
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Luke Lu commented on HADOOP-6884:
---------------------------------
The debug log check is critical for performance sensitive paths. Due to lack of
macros in Java, log wrappers doesn't really help if additional objects need to
be created for the messages (the template stuff helps but not in many cases.)
-1 for yet another home brew log wrappers.
+1 for slf4j.
> 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
> Fix For: 0.22.0
>
> Attachments: 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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