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https://issues.apache.org/jira/browse/YARN-3627?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=14541201#comment-14541201
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Bibin A Chundatt commented on YARN-3627:
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[~kasha] seems related to YARN-3405 .Will try the patch soon. Would be great if
YARN-3405 gets resolved.
> Preemption not triggered in Fair scheduler when maxResources is set on parent
> queue
> -----------------------------------------------------------------------------------
>
> Key: YARN-3627
> URL: https://issues.apache.org/jira/browse/YARN-3627
> Project: Hadoop YARN
> Issue Type: Bug
> Components: fairscheduler, scheduler
> Environment: Suse 11 SP3, 2 NM
> Reporter: Bibin A Chundatt
>
> Consider the below scenario of fair configuration
>
> Root (10Gb cluster resource)
> --Q1 (maxResources 4gb)
> ----Q1.1 (maxResources 4gb)
> ----Q1.2 (maxResources 4gb)
> --Q2 (maxResources 6GB)
>
> No applications are running in Q2
>
> Submit one application with to Q1.1 with 50 maps & 4Gb gets allocated to Q1.1
> Now submit application to Q1.2 the same will be starving for memory always.
>
> Preemption will never get triggered since
> yarn.scheduler.fair.preemption.cluster-utilization-threshold =.8 and the
> cluster utilization is below .8.
>
> *Fairscheduler.java*
> {code}
> private boolean shouldAttemptPreemption() {
> if (preemptionEnabled) {
> return (preemptionUtilizationThreshold < Math.max(
> (float) rootMetrics.getAllocatedMB() / clusterResource.getMemory(),
> (float) rootMetrics.getAllocatedVirtualCores() /
> clusterResource.getVirtualCores()));
> }
> return false;
> }
> {code}
> Are we supposed to configure in running cluster maxResources <0mb and 0
> cores > so that all queues can take full cluster resources always if
> available??
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