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From "Walter Su (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (HDFS-7978) Add LOG.isDebugEnabled() guard for some LOG.debug(..)
Date Wed, 25 Mar 2015 02:32:53 GMT

    [ https://issues.apache.org/jira/browse/HDFS-7978?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=14379171#comment-14379171
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Walter Su commented on HDFS-7978:
---------------------------------

PerformanceAdvisory.LOG is slf4j, so I rewrite the message arguments in template-style.

> Add LOG.isDebugEnabled() guard for some LOG.debug(..)
> -----------------------------------------------------
>
>                 Key: HDFS-7978
>                 URL: https://issues.apache.org/jira/browse/HDFS-7978
>             Project: Hadoop HDFS
>          Issue Type: Improvement
>            Reporter: Walter Su
>            Assignee: Walter Su
>         Attachments: HDFS-7978.001.patch, HDFS-7978.002.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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