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From "Hemanth Yamijala (JIRA)" <j...@apache.org>
Subject [jira] Commented: (HADOOP-4803) large pending jobs hog resources
Date Mon, 09 Feb 2009 03:54:59 GMT

    [ https://issues.apache.org/jira/browse/HADOOP-4803?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12671720#action_12671720
] 

Hemanth Yamijala commented on HADOOP-4803:
------------------------------------------

So, do you mean that you won't maintain job deficits at all, and instead you would maintain
how much time pools (or jobs) have not got their min share, and sort by that ?

> large pending jobs hog resources
> --------------------------------
>
>                 Key: HADOOP-4803
>                 URL: https://issues.apache.org/jira/browse/HADOOP-4803
>             Project: Hadoop Core
>          Issue Type: Bug
>          Components: contrib/fair-share
>            Reporter: Joydeep Sen Sarma
>            Assignee: Matei Zaharia
>
> 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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