Github user tgravescs commented on a diff in the pull request:
https://github.com/apache/spark/pull/900#discussion_r14265985
--- Diff:
yarn/common/src/main/scala/org/apache/spark/scheduler/cluster/YarnClusterSchedulerBackend.scala
---
@@ -0,0 +1,39 @@
+/*
+ * 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.SparkContext
+import org.apache.spark.scheduler.TaskSchedulerImpl
+import org.apache.spark.util.IntParam
+
+private[spark] class YarnClusterSchedulerBackend(
+ scheduler: TaskSchedulerImpl,
+ sc: SparkContext)
+ extends CoarseGrainedSchedulerBackend(scheduler, sc.env.actorSystem) {
+
+ override def start() {
+ super.start()
+ var numExecutors = 2
+ if (sc.getConf.contains("spark.executor.instances")) {
+ numExecutors = sc.getConf.getInt("spark.executor.instances", 2)
+ } else if (System.getenv("SPARK_EXECUTOR_INSTANCES") != null) {
+
IntParam.unapply(System.getenv("SPARK_EXECUTOR_INSTANCES")).map(_.toInt).getOrElse(2)
--- End diff --
well the SPARK_WORKER_INSTANCES env variables was only using in yarn-client
mode so isn't strictly needed here since this class is backend for yarn-cluster
mode.. I assume that is why it was removed. Something I hadn't thought of
when you first asked.
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