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https://issues.apache.org/jira/browse/HADOOP-4803?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12671337#action_12671337
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Matei Zaharia commented on HADOOP-4803:
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In fact upon further discussion with Joydeep and Dhruba, we may drop deficits
altogether once we add preemption and just use a similar concept for guaranteed
shares to make sure pools get their min share in order of how long they've been
waiting for it. This will simplify the code and make the scheduler behavior
easier to understand.
> 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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