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https://issues.apache.org/jira/browse/YARN-3891?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Siqi Li updated YARN-3891:
--------------------------
    Description: 
Based on FairSharePolicy, FSLeafQueue will try to schedule an app that has the 
lowest resource consumption first.
However, we have seen some apps that have several thousand reducers stuck at 
waiting for some newly scheduled mappers to launch. However, it would be very 
difficult for such apps to get resources if there are many other jobs with low 
resource consumption and the queue is full.

If the queue keeps getting new applications, then the stuck reducers would 
never finish.

  was:Based on FairSharePolicy, FSLeafQueue 


> Apps are starved for resource due to default FairSharePolicy in Fair Scheduler
> ------------------------------------------------------------------------------
>
>                 Key: YARN-3891
>                 URL: https://issues.apache.org/jira/browse/YARN-3891
>             Project: Hadoop YARN
>          Issue Type: Bug
>            Reporter: Siqi Li
>            Priority: Critical
>
> Based on FairSharePolicy, FSLeafQueue will try to schedule an app that has 
> the lowest resource consumption first.
> However, we have seen some apps that have several thousand reducers stuck at 
> waiting for some newly scheduled mappers to launch. However, it would be very 
> difficult for such apps to get resources if there are many other jobs with 
> low resource consumption and the queue is full.
> If the queue keeps getting new applications, then the stuck reducers would 
> never finish.



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