[jira] [Updated] (HDFS-13701) Removal of logging guards regressed performance

["Shilun Fan (Jira)" <ji...@apache.org>]

     [ https://issues.apache.org/jira/browse/HDFS-13701?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]

Shilun Fan updated HDFS-13701:
------------------------------
    Target Version/s: 3.5.0  (was: 3.4.0)

> 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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