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Bibin A Chundatt resolved YARN-3627. ------------------------------------ Resolution: Not A Problem Closing this issue as per comments > 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?? -- This message was sent by Atlassian JIRA (v6.3.4#6332)