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Date: Tue, 10 Nov 2009 08:04:28 +0000 (UTC)
From: "Matei Zaharia (JIRA)" <jira@apache.org>
To: mapreduce-issues@hadoop.apache.org
Subject: [jira] Updated: (MAPREDUCE-543) large pending jobs hog resources
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     [ https://issues.apache.org/jira/browse/MAPREDUCE-543?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]

Matei Zaharia updated MAPREDUCE-543:
------------------------------------

    Assignee: Matei Zaharia  (was: Matei Zaharia)

> large pending jobs hog resources
> --------------------------------
>
>                 Key: MAPREDUCE-543
>                 URL: https://issues.apache.org/jira/browse/MAPREDUCE-543
>             Project: Hadoop Map/Reduce
>          Issue Type: Bug
>            Reporter: Joydeep Sen Sarma
>            Assignee: Matei Zaharia
>             Fix For: 0.21.0
>
>
> observing the cluster over the last day - one thing i noticed is that small jobs (single digit tasks) are not doing a good job competing against large jobs. what seems to happen is that:
> - large job comes along and needs to wait for a while for other large jobs.
> - slots are slowly transfered from one large job to another
> - small tasks keep waiting forever.
> is this an artifact of deficit based scheduling? it seems that long pending large jobs are out-scheduling small jobs

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