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https://issues.apache.org/jira/browse/HADOOP-11741?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=14379419#comment-14379419
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Tsuyoshi Ozawa commented on HADOOP-11741:
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+1, committing this shortly.
> Add LOG.isDebugEnabled() guard for some LOG.debug(..)
> -----------------------------------------------------
>
> Key: HADOOP-11741
> URL: https://issues.apache.org/jira/browse/HADOOP-11741
> Project: Hadoop Common
> Issue Type: Improvement
> Reporter: Walter Su
> Assignee: Walter Su
> Attachments: HADOOP-11741.001.patch, HADOOP-11741.002.patch
>
>
> {{isDebugEnabled()}} is optional. But when there are :
> 1. lots of concatenating Strings
> 2. complicated function calls
> in the arguments, {{LOG.debug(..)}} should be guarded with
> {{LOG.isDebugEnabled()}} to avoid unnecessary arguments evaluation and impove
> performance.
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