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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 resolved YARN-3891.
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Resolution: Duplicate
Assignee: Siqi Li
> 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
> Components: fairscheduler
> Reporter: Siqi Li
> Assignee: 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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