Github user NicoK commented on a diff in the pull request:
https://github.com/apache/flink/pull/6294#discussion_r202720265
--- Diff:
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");
--- End diff --
Also, please put the configuration parameters into some code environment,
e.g.
`<tt>org.apache.hadoop.yarn.server.resourcemanager.scheduler.fair.FairScheduler</tt>`,
for the config.html page.
---
