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From "Allen Wittenauer (Updated) (JIRA)" <j...@apache.org>
Subject [jira] [Updated] (MAPREDUCE-4058) adjustable task priority
Date Fri, 23 Mar 2012 01:10:24 GMT

     [ https://issues.apache.org/jira/browse/MAPREDUCE-4058?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel

Allen Wittenauer updated MAPREDUCE-4058:

    Attachment: MAPREDUCE-4058-branch-1.0.patch

This patch adds a variable to the task-controller.cfg called 'task.niceness.adjustment' that
acts similarly to renice. Note that setpriority() is called while still root, allowing for
the tasks to be set to a HIGHER priority than the TT, if someone so desires to.
> 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
>         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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