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From "Wangda Tan (JIRA)" <j...@apache.org>
Subject [jira] [Updated] (YARN-8292) Fix the dominant resource preemption cannot happen when some of the resource vector becomes negative
Date Tue, 15 May 2018 18:24:00 GMT

     [ https://issues.apache.org/jira/browse/YARN-8292?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
]

Wangda Tan updated YARN-8292:
-----------------------------
    Attachment: YARN-8292.001.patch

> Fix the dominant resource preemption cannot happen when some of the resource vector becomes
negative
> ----------------------------------------------------------------------------------------------------
>
>                 Key: YARN-8292
>                 URL: https://issues.apache.org/jira/browse/YARN-8292
>             Project: Hadoop YARN
>          Issue Type: Bug
>          Components: yarn
>            Reporter: Sumana Sathish
>            Assignee: Wangda Tan
>            Priority: Critical
>         Attachments: YARN-8292.001.patch
>
>
>  
>  This is an example of the problem: (Same if we have more than 2 resources)
>   
> Let's say we have 3 queues A/B/C. All containers with equal size <2,3>
>  
> ||Queue||Guaranteed||Used ||Pending||
> |A|<20, 10>|<20,30>| |
> |B|<20, 10>|0|0|
> |C|<20, 10>|0|<20, 30>|
> | | | | |
>  
> Under current logic, A's calculated to-preempt (how much resource other queue can preempt)
will be <0, 20>. The preemption will not happen. However, under the context of DRC,
queue A is using more resource than guaranteed, so queue C will be starved



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