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From "Arun C Murthy (JIRA)" <j...@apache.org>
Subject [jira] Updated: (HADOOP-3366) Shuffle/Merge improvements
Date Fri, 06 Jun 2008 07:00:45 GMT

     [ https://issues.apache.org/jira/browse/HADOOP-3366?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
]

Arun C Murthy updated HADOOP-3366:
----------------------------------

    Attachment: HADOOP-3366_0_20080605.patch

Patch to stall shuffle when there isn't enough space left in RAM to accomodate the map-output.

With this patch the single-reducer job which merges 12.5G from 2500maps on 25 machines runs
in ~18mins, compared to 30odd mins after HADOOP-2095 (prior to which it was 45mins).

> Shuffle/Merge improvements
> --------------------------
>
>                 Key: HADOOP-3366
>                 URL: https://issues.apache.org/jira/browse/HADOOP-3366
>             Project: Hadoop Core
>          Issue Type: Improvement
>          Components: mapred
>            Reporter: Arun C Murthy
>            Assignee: Arun C Murthy
>             Fix For: 0.18.0
>
>         Attachments: 3366.1.patch, 3366.1.patch, HADOOP-3366_0_20080605.patch, ifile.patch
>
>
> This is intended to be a meta-issue to track various improvements to shuffle/merge in
the reducer.

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