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Posted to hdfs-dev@hadoop.apache.org by "Wei-Chiu Chuang (Jira)" <ji...@apache.org> on 2021/06/16 06:33:00 UTC

[jira] [Created] (HDFS-16074) Remove an expensive debug string concatenation

Wei-Chiu Chuang created HDFS-16074:
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             Summary: 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
         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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