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Posted to mapreduce-dev@hadoop.apache.org by "Matei Zaharia (JIRA)" <ji...@apache.org> on 2009/11/10 09:02:28 UTC
[jira] Resolved: (MAPREDUCE-543) large pending jobs hog resources
[ https://issues.apache.org/jira/browse/MAPREDUCE-543?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]
Matei Zaharia resolved MAPREDUCE-543.
-------------------------------------
Resolution: Duplicate
Fix Version/s: 0.21.0
Yes indeed, this issue was fixed as part of MAPREDUCE-706, so I'm closing it as a duplicate.
> 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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