Github user hbhanawat commented on a diff in the pull request:
https://github.com/apache/spark/pull/11723#discussion_r57309422
--- Diff:
core/src/main/scala/org/apache/spark/scheduler/ExternalClusterManager.scala ---
@@ -0,0 +1,62 @@
+/*
+ * 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
+
+import org.apache.spark.SparkContext
+import org.apache.spark.annotation.DeveloperApi
+
+/**
+ * :: DeveloperApi ::
+ * A cluster manager interface to plugin external scheduler.
+ *
+ */
+@DeveloperApi
+private[spark] trait ExternalClusterManager {
+
+ /**
+ * Check if this cluster manager instance can create scheduler components
+ * for a certain master URL.
+ * @param masterURL the master URL
+ * @return True if the cluster manager can create scheduler backend/
+ */
+ def canCreate(masterURL : String): Boolean
+
+ /**
+ * Create a task scheduler instance for the given SparkContext
+ * @param sc SparkContext
+ * @return TaskScheduler that will be responsible for task handling
+ */
+ def createTaskScheduler (sc: SparkContext): TaskScheduler
+
+ /**
+ * Create a scheduler backend for the given SparkContext and scheduler.
This is
+ * called after task scheduler is created using
[[ExternalClusterManager.createTaskScheduler()]].
+ * @param sc SparkContext
+ * @param scheduler TaskScheduler that will be used with the scheduler
backend.
+ * @return SchedulerBackend that works with a TaskScheduler
+ */
+ def createSchedulerBackend (sc: SparkContext, scheduler: TaskScheduler):
SchedulerBackend
--- End diff --
Done.
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