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https://issues.apache.org/jira/browse/HDFS-13701?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Chris Nauroth updated HDFS-13701:
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Target Version/s: 3.5.1
> Removal of logging guards regressed performance
> -----------------------------------------------
>
> Key: HDFS-13701
> URL: https://issues.apache.org/jira/browse/HDFS-13701
> Project: Hadoop HDFS
> Issue Type: Bug
> Components: performance
> Affects Versions: 3.0.0
> Reporter: Todd Lipcon
> Priority: Major
>
> HDFS-8971 removed various logging guards from hot methods in the DFS client.
> In theory using a format string with {} placeholders is equivalent, but in
> fact it's not equivalent when one or more of the variable arguments are
> primitives. To be passed as part of the varargs array, the primitives need to
> be boxed. I am seeing Integer.valueOf() inside BlockReaderLocal.read taking
> ~3% of CPU.
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