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Posted to common-issues@hadoop.apache.org by "Allen Wittenauer (JIRA)" <ji...@apache.org> on 2015/05/06 05:36:41 UTC

[jira] [Updated] (HADOOP-10778) Use NativeCrc32 only if it is faster

     [ https://issues.apache.org/jira/browse/HADOOP-10778?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]

Allen Wittenauer updated HADOOP-10778:
--------------------------------------
    Labels: BB2015-05-TBR  (was: )

> Use NativeCrc32 only if it is faster
> ------------------------------------
>
>                 Key: HADOOP-10778
>                 URL: https://issues.apache.org/jira/browse/HADOOP-10778
>             Project: Hadoop Common
>          Issue Type: Improvement
>          Components: util
>            Reporter: Tsz Wo Nicholas Sze
>            Assignee: Tsz Wo Nicholas Sze
>              Labels: BB2015-05-TBR
>         Attachments: c10778_20140702.patch, c10778_20140717.patch
>
>
> From the benchmark post in [this comment|https://issues.apache.org/jira/browse/HDFS-6560?focusedCommentId=14044060&page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel#comment-14044060], NativeCrc32 is slower than java.util.zip.CRC32 for Java 7 and above when bytesPerChecksum > 512.



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