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From "Chris Douglas (JIRA)" <j...@apache.org>
Subject [jira] Updated: (HADOOP-287) Speed up SequenceFile sort with memory reduction
Date Sun, 03 Feb 2008 05:36:10 GMT

     [ https://issues.apache.org/jira/browse/HADOOP-287?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
]

Chris Douglas updated HADOOP-287:
---------------------------------

    Status: Patch Available  (was: Open)

> Speed up SequenceFile sort with memory reduction
> ------------------------------------------------
>
>                 Key: HADOOP-287
>                 URL: https://issues.apache.org/jira/browse/HADOOP-287
>             Project: Hadoop Core
>          Issue Type: Improvement
>          Components: io
>    Affects Versions: 0.17.0
>            Reporter: Benjamin Reed
>            Assignee: Doug Cutting
>         Attachments: 287-1.patch, 287-2.patch, 287-2.patch, s.patch, zoom-sort.patch,
zoom-sort.patch
>
>
> I replaced the merge sort with a quick sort and it yielded approx 30% improvement in
sort time. It also reduced the memory requirement for sorting because the sort is done in
place.

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