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https://issues.apache.org/jira/browse/MAPREDUCE-4058?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Allen Wittenauer resolved MAPREDUCE-4058.
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Resolution: Won't Fix
Y! was able to get a different patch into 0.23 and 2.x that provides similar
(if limited) capability.
> adjustable task priority
> ------------------------
>
> Key: MAPREDUCE-4058
> URL: https://issues.apache.org/jira/browse/MAPREDUCE-4058
> Project: Hadoop Map/Reduce
> Issue Type: New Feature
> Components: task-controller
> Affects Versions: 1.0.0
> Reporter: Allen Wittenauer
> Assignee: Mark Wagner
> Attachments: MAPREDUCE-4058-branch-1.0.patch
>
>
> For those of us that completely destroy our CPUs, it is beneficial to be able
> to run user tasks at a different priority than the tasktracker. This would
> allow for TTs (and by extension, DNs) to get more CPU clock cycles so that
> things like heartbeats don't disappear.
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