You are viewing a plain text version of this content. The canonical link for it is here.

Posted to common-issues@hadoop.apache.org by "Eli Collins (Updated) (JIRA)" <ji...@apache.org> on 2012/02/07 00:35:01 UTC

[jira] [Updated] (HADOOP-7761) Improve performance of raw comparisons

     [ https://issues.apache.org/jira/browse/HADOOP-7761?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]

Eli Collins updated HADOOP-7761:
--------------------------------

    Target Version/s: 0.23.1  (was: 0.24.0)

Agree
                
> Improve performance of raw comparisons
> --------------------------------------
>
>                 Key: HADOOP-7761
>                 URL: https://issues.apache.org/jira/browse/HADOOP-7761
>             Project: Hadoop Common
>          Issue Type: Improvement
>          Components: io, performance, util
>    Affects Versions: 0.23.0
>            Reporter: Todd Lipcon
>            Assignee: Todd Lipcon
>             Fix For: 0.24.0
>
>         Attachments: hadoop-7761.txt, hadoop-7761.txt, hadoop-7761.txt, hadoop-7761.txt
>
>
> Guava has a nice implementation of lexicographical byte-array comparison that uses sun.misc.Unsafe to compare unsigned byte arrays long-at-a-time. Their benchmarks show it as being 2x more CPU-efficient than the equivalent pure-Java implementation. We can easily integrate this into WritableComparator.compareBytes to improve CPU performance in the shuffle.

--
This message is automatically generated by JIRA.
If you think it was sent incorrectly, please contact your JIRA administrators: https://issues.apache.org/jira/secure/ContactAdministrators!default.jspa
For more information on JIRA, see: http://www.atlassian.com/software/jira