[jira] [Updated] (MAPREDUCE-7464) Make priority of mapreduce tasks configurable

["liu bin (Jira)" <ji...@apache.org>]

     [ https://issues.apache.org/jira/browse/MAPREDUCE-7464?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]

liu bin updated MAPREDUCE-7464:
-------------------------------
    Summary: Make priority of mapreduce tasks configurable  (was: Make priority of mapreduce containers configurable)

> Make priority of mapreduce tasks configurable
> ---------------------------------------------
>
>                 Key: MAPREDUCE-7464
>                 URL: https://issues.apache.org/jira/browse/MAPREDUCE-7464
>             Project: Hadoop Map/Reduce
>          Issue Type: Improvement
>            Reporter: liu bin
>            Priority: Major
>
> When maps and reduces run simultaneously, if resources are insufficient, reduces will be preempted.
> Because the priority of reduce is higher than map, the preempted reduces will first obtain resources when rerun, and then be preempted again, falling into a loop.
> We need to configure the priority of map higher than reduce to avoid this situation.



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