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https://issues.apache.org/jira/browse/HDFS-16074?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Wei-Chiu Chuang reassigned HDFS-16074:
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Assignee: Wei-Chiu Chuang
> Remove an expensive debug string concatenation
> ----------------------------------------------
>
> Key: HDFS-16074
> URL: https://issues.apache.org/jira/browse/HDFS-16074
> Project: Hadoop HDFS
> Issue Type: Improvement
> Affects Versions: 3.4.0
> Reporter: Wei-Chiu Chuang
> Assignee: Wei-Chiu Chuang
> Priority: Major
> Attachments: Screen Shot 2021-06-16 at 2.32.29 PM.png
>
>
> Running a YCSB load query, found that we do an expensive string concatenation
> on the write path in DFSOutputStream.writeChunkPrepare().
> Nearly 25% of HDFS client write CPU time is spent here. It is not necessary
> because it's supposed to be a debug message. So let's remove it.
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