Github user vanzin commented on a diff in the pull request: https://github.com/apache/spark/pull/3916#discussion_r22889233 --- Diff: launcher/src/main/java/org/apache/spark/launcher/Main.java --- @@ -0,0 +1,106 @@ +/* + * 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.IOException; +import java.util.ArrayList; +import java.util.Arrays; +import java.util.HashMap; +import java.util.Iterator; +import java.util.List; +import java.util.Map; + +/** + * Command line interface for the Spark launcher. Used internally by Spark scripts. + */ +public class Main extends LauncherCommon { + + /** + * 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> + * + * The ultimate command will not be run in the same process. Instead, the command to be executed + * will be printed to stdout. On Unix systems, this will be one argument per line. On Windows + * systems, this will be a single line containing the command to be executed. + */ + public static void main(String[] argsArray) throws Exception { + checkArgument(argsArray.length > 0, "Not enough arguments: missing class name."); + + List<String> args = new ArrayList<String>(Arrays.asList(argsArray)); + String className = args.remove(0); + + boolean printLaunchCommand = false; + AbstractLauncher<?> launcher; + try { + if (className.equals("org.apache.spark.deploy.SparkSubmit")) { + launcher = new SparkSubmitCliLauncher(args); + printLaunchCommand = !isEmpty(System.getenv("SPARK_PRINT_LAUNCH_COMMAND")); + } else if (className.equals("pyspark")) { + launcher = new PySparkLauncher(args); + } else { + launcher = new SparkClassLauncher(className, args); + printLaunchCommand = !isEmpty(System.getenv("SPARK_PRINT_LAUNCH_COMMAND")); --- End diff -- Because the current scripts don't do it. Easy enough to add if wanted...
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