1 files changed, 56 insertions, 0 deletions
diff --git a/yarn/src/main/scala/org/apache/spark/scheduler/cluster/YarnClusterScheduler.scala b/yarn/src/main/scala/org/apache/spark/scheduler/cluster/YarnClusterScheduler.scala
new file mode 100644
index 0000000000..4157ff95c2
--- /dev/null
+++ b/yarn/src/main/scala/org/apache/spark/scheduler/cluster/YarnClusterScheduler.scala
@@ -0,0 +1,56 @@
+/*
+ * Licensed to the Apache Software Foundation (ASF) under one or more
+ * contributor license agreements.  See the NOTICE file distributed with
+ * this work for additional information regarding copyright ownership.
+ * The ASF licenses this file to You under the Apache License, Version 2.0
+ * (the "License"); you may not use this file except in compliance with
+ * the License.  You may obtain a copy of the License at
+ *
+ *    http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+package org.apache.spark.scheduler.cluster
+
+import org.apache.spark._
+import org.apache.spark.deploy.yarn.{ApplicationMaster, YarnSparkHadoopUtil}
+import org.apache.spark.scheduler.TaskSchedulerImpl
+import org.apache.spark.util.Utils
+
+/**
+ * This is a simple extension to ClusterScheduler - to ensure that appropriate initialization of
+ * ApplicationMaster, etc is done
+ */
+private[spark] class YarnClusterScheduler(sc: SparkContext) extends TaskSchedulerImpl(sc) {
+
+  logInfo("Created YarnClusterScheduler")
+
+  // Nothing else for now ... initialize application master : which needs a SparkContext to
+  // determine how to allocate.
+  // Note that only the first creation of a SparkContext influences (and ideally, there must be
+  // only one SparkContext, right ?). Subsequent creations are ignored since executors are already
+  // allocated by then.
+
+  // By default, rack is unknown
+  override def getRackForHost(hostPort: String): Option[String] = {
+    val host = Utils.parseHostPort(hostPort)._1
+    Option(YarnSparkHadoopUtil.lookupRack(sc.hadoopConfiguration, host))
+  }
+
+  override def postStartHook() {
+    ApplicationMaster.sparkContextInitialized(sc)
+    super.postStartHook()
+    logInfo("YarnClusterScheduler.postStartHook done")
+  }
+
+  override def stop() {
+    super.stop()
+    ApplicationMaster.sparkContextStopped(sc)
+  }
+
+}