[GitHub] dawidwys commented on a change in pull request #6294: [FLINK-9013][docs] Document yarn.containers.vcores only being effective whe…

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dawidwys commented on a change in pull request #6294: [FLINK-9013][docs] Document yarn.containers.vcores only being effective whe…
URL: https://github.com/apache/flink/pull/6294#discussion_r205459192
 
 

 ##########
 File path: flink-yarn/src/main/java/org/apache/flink/yarn/configuration/YarnConfigOptions.java
 ##########
 @@ -65,7 +65,11 @@
 		key("yarn.containers.vcores")
 		.defaultValue(-1)
 		.withDescription("The number of virtual cores (vcores) per YARN container. By default, the number of vcores" +
-			" is set to the number of slots per TaskManager, if set, or to 1, otherwise.");
+			" is set to the number of slots per TaskManager, if set, or to 1, otherwise. In order for this parameter " +
+			"to be used your cluster must have CPU scheduling enabled. You can do this e.g. by setting the " +
+			"org.apache.hadoop.yarn.server.resourcemanager.scheduler.fair.FairScheduler or enabling " +
+			"org.apache.hadoop.yarn.util.resource.DominantResourceCalculator for " +
+			"org.apache.hadoop.yarn.server.resourcemanager.scheduler.capacity.CapacityScheduler");
 
 Review comment:
   You were right @NicoK . The `DominantResourceCalculator` didn't work for me in 2.8.3. Sorry for the confusion.

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