Github user vanzin commented on a diff in the pull request:
https://github.com/apache/spark/pull/5242#discussion_r28188996
--- Diff:
yarn/src/main/scala/org/apache/spark/deploy/yarn/YarnAllocator.scala ---
@@ -117,6 +117,24 @@ private[yarn] class YarnAllocator(
// For testing
private val launchContainers =
sparkConf.getBoolean("spark.yarn.launchContainers", true)
+ private val labelExpression =
sparkConf.getOption("spark.yarn.nodeLabelExpression")
+
+ // ContainerRequest constructor that can take a node label expression.
We grab it through
+ // reflection because it's only available in later versions of YARN.
+ private val nodeLabelConstructor = labelExpression.flatMap { expr =>
+ try {
+ Some(classOf[ContainerRequest].getConstructor(classOf[Resource],
--- End diff --
Looks correct to me. From the hadoop code:
public ContainerRequest(Resource capability, String[] nodes,
String[] racks, Priority priority, boolean relaxLocality) {
this(capability, nodes, racks, priority, relaxLocality, null);
}
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