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https://issues.apache.org/jira/browse/MAPREDUCE-543?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Matei Zaharia updated MAPREDUCE-543:
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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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