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From "Junping Du (JIRA)" <j...@apache.org>
Subject [jira] [Assigned] (YARN-999) In case of long running tasks, reduce node resource should balloon out resource quickly by calling preemption API and suspending running task.
Date Wed, 13 Nov 2013 23:21:21 GMT

     [ https://issues.apache.org/jira/browse/YARN-999?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
]

Junping Du reassigned YARN-999:
-------------------------------

    Assignee: Junping Du

> In case of long running tasks, reduce node resource should balloon out resource quickly
by calling preemption API and suspending running task. 
> -----------------------------------------------------------------------------------------------------------------------------------------------
>
>                 Key: YARN-999
>                 URL: https://issues.apache.org/jira/browse/YARN-999
>             Project: Hadoop YARN
>          Issue Type: Sub-task
>          Components: nodemanager, scheduler
>            Reporter: Junping Du
>            Assignee: Junping Du
>
> In current design and implementation, when we decrease resource on node to less than
resource consumption of current running tasks, tasks can still be running until the end. But
just no new task get assigned on this node (because AvailableResource < 0) until some tasks
are finished and AvailableResource > 0 again. This is good for most cases but in case of
long running task, it could be too slow for resource setting to actually work so preemption
could be hired here.



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