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https://issues.apache.org/jira/browse/YARN-4212?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15836575#comment-15836575
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ASF GitHub Bot commented on YARN-4212:
--------------------------------------
Github user kambatla commented on a diff in the pull request:
https://github.com/apache/hadoop/pull/181#discussion_r97641888
--- Diff:
hadoop-yarn-project/hadoop-yarn/hadoop-yarn-server/hadoop-yarn-server-resourcemanager/src/main/java/org/apache/hadoop/yarn/server/resourcemanager/scheduler/fair/policies/FairSharePolicy.java
---
@@ -178,4 +179,15 @@ public boolean checkIfUsageOverFairShare(Resource
usage, Resource fairShare) {
public byte getApplicableDepth() {
return SchedulingPolicy.DEPTH_ANY;
}
+
+ @Override
+ public boolean isChildPolicyAllowed(SchedulingPolicy childPolicy)
+ throws AllocationConfigurationException {
+ if (childPolicy instanceof DominantResourceFairnessPolicy) {
--- End diff --
Based on my earlier comment, this should be `return ! (childPolicy
instanceof DominantResourceFairnessPolicy`
> FairScheduler: Parent queues is not allowed to be 'Fair' policy if its
> children have the "drf" policy
> -----------------------------------------------------------------------------------------------------
>
> Key: YARN-4212
> URL: https://issues.apache.org/jira/browse/YARN-4212
> Project: Hadoop YARN
> Issue Type: Bug
> Reporter: Arun Suresh
> Assignee: Yufei Gu
> Labels: fairscheduler
> Attachments: YARN-4212.002.patch, YARN-4212.003.patch,
> YARN-4212.004.patch, YARN-4212.005.patch, YARN-4212.006.patch,
> YARN-4212.007.patch, YARN-4212.1.patch
>
>
> The Fair Scheduler, while performing a {{recomputeShares()}} during an
> {{update()}} call, uses the parent queues policy to distribute shares to its
> children.
> If the parent queues policy is 'fair', it only computes weight for memory and
> sets the vcores fair share of its children to 0.
> Assuming a situation where we have 1 parent queue with policy 'fair' and
> multiple leaf queues with policy 'drf', Any app submitted to the child queues
> with vcore requirement > 1 will always be above fairshare, since during the
> recomputeShare process, the child queues were all assigned 0 for fairshare
> vcores.
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