Github user rxin commented on a diff in the pull request:
https://github.com/apache/spark/pull/11723#discussion_r59979061
--- Diff:
core/src/main/scala/org/apache/spark/scheduler/ExternalClusterManager.scala ---
@@ -0,0 +1,65 @@
+/*
+ * 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
+trait ExternalClusterManager {
--- End diff --
i just realized most of the return types used in this class are
private[spark], so your implementation of this interface would need to be in
the spark package anyway. I'm going to add private[spark] to this when I merge.
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