Github user pwendell commented on a diff in the pull request:
https://github.com/apache/spark/pull/3916#discussion_r26065985
--- Diff: launcher/src/main/java/org/apache/spark/launcher/Main.java ---
@@ -0,0 +1,173 @@
+/*
+ * 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.util.ArrayList;
+import java.util.Arrays;
+import java.util.HashMap;
+import java.util.List;
+import java.util.Map;
+
+import static org.apache.spark.launcher.CommandBuilderUtils.*;
+
+/**
+ * Command line interface for the Spark launcher. Used internally by Spark
scripts.
+ */
+class Main {
+
+ /**
+ * Usage: Main [class] [class args]
+ * <p/>
+ * This CLI works in two different modes:
+ * <ul>
+ * <li>"spark-submit": if <i>class</i> is
"org.apache.spark.deploy.SparkSubmit", the
+ * {@link SparkLauncher} class is used to launch a Spark
application.</li>
+ * <li>"spark-class": if another class is provided, an internal Spark
class is run.</li>
+ * </ul>
+ *
+ * This class works in tandem with the "bin/spark-class" script on
Unix-like systems, and
+ * "bin/spark-class2.cmd" batch script on Windows to execute the final
command.
+ * <p/>
+ * On Unix-like systems, the output is a list of command arguments,
separated by the NULL
+ * character. On Windows, the output is single command line suitable for
direct execution
+ * form the script.
--- End diff --
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