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https://issues.apache.org/jira/browse/HADOOP-4803?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12716087#action_12716087
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Matei Zaharia commented on HADOOP-4803:
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A note on progress for this issue: I have a tested patch that removes deficits
and also adds support for FIFO pools, but I am waiting for HADOOP-4665 and
HADOOP-4667 to be committed before posting it because it depends on those.
> 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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