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From "Junping Du (JIRA)" <j...@apache.org>
Subject [jira] [Updated] (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 Tue, 30 Jul 2013 16:27:49 GMT

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

Junping Du updated YARN-999:
----------------------------

    Description: 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.
    
> 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
>
> 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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