Github user pwendell commented on a diff in the pull request:
https://github.com/apache/spark/pull/3916#discussion_r24959140
--- Diff:
launcher/src/main/java/org/apache/spark/launcher/AbstractLauncher.java ---
@@ -0,0 +1,499 @@
+/*
+ * 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.launcher;
+
+import java.io.BufferedReader;
+import java.io.File;
+import java.io.FileFilter;
+import java.io.FileInputStream;
+import java.io.InputStreamReader;
+import java.io.IOException;
+import java.util.ArrayList;
+import java.util.Arrays;
+import java.util.Collections;
+import java.util.HashMap;
+import java.util.List;
+import java.util.Map;
+import java.util.Properties;
+import java.util.jar.JarFile;
+import java.util.regex.Pattern;
+
+/**
+ * Basic functionality for launchers - objects that encapsulate knowledge
about how to build the
+ * commands to run a Spark application or service. This class is not meant
to be extended by user
+ * code.
+ */
+public abstract class AbstractLauncher<T extends AbstractLauncher> extends
LauncherCommon {
--- End diff --
Can this be made package private if we don't expect users to extend it? It
looks like every use of this is inside of the launcher package.
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