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https://issues.apache.org/jira/browse/HDFS-7978?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=14377321#comment-14377321
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Andrew Wang commented on HDFS-7978:
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Hey Walter, you can pass objects into slf4j log methods without calling
{{toString}} on them first, and I believe slf4j only calls {{toString}} if the
log level is enabled. This saves the construction and {{toString}} costs.
> 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
>
>
> {{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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