Github user pwendell commented on a diff in the pull request: https://github.com/apache/spark/pull/1845#discussion_r16397499 --- Diff: core/src/main/scala/org/apache/spark/deploy/SparkClassLauncher.scala --- @@ -0,0 +1,116 @@ +/* + * 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.deploy + +import java.io.File + +import scala.collection.JavaConversions._ + +import org.apache.spark.util.{RedirectThread, Utils} + +/** + * Wrapper of `bin/spark-class` that prepares the launch environment of the child JVM properly. + * This is currently only used for running Spark submit in client mode. The goal moving forward + * is to use this class for all use cases of `bin/spark-class`. + */ +object SparkClassLauncher { + + /** + * Launch a Spark class with the given class paths, library paths, java options and memory. + * If we are launching an application through Spark submit in client mode, we must also + * take into account special `spark.driver.*` properties needed to start the driver JVM. + */ + def main(args: Array[String]): Unit = { + if (args.size < 8) { + System.err.println( + """ + |Usage: org.apache.spark.deploy.SparkClassLauncher + | + | [properties file] - path to your Spark properties file + | [java runner] - command to launch the child JVM + | [java class paths] - class paths to pass to the child JVM + | [java library paths] - library paths to pass to the child JVM + | [java opts] - java options to pass to the child JVM + | [java memory] - memory used to launch the child JVM + | [client mode] - whether the child JVM will run the Spark driver + | [main class] - main class to run in the child JVM + | <main args> - arguments passed to this main class + | + |Example: + | org.apache.spark.deploy.SparkClassLauncher.SparkClassLauncher + | conf/spark-defaults.conf java /classpath1:/classpath2 /librarypath1:/librarypath2 + | "-XX:-UseParallelGC -Dsome=property" 5g true org.apache.spark.deploy.SparkSubmit + | --master local --class org.apache.spark.examples.SparkPi 10 + """.stripMargin) + System.exit(1) + } + val propertiesFile = args(0) + val javaRunner = args(1) + val clClassPaths = args(2) + val clLibraryPaths = args(3) + val clJavaOpts = Utils.splitCommandString(args(4)) + val clJavaMemory = args(5) + val clientMode = args(6) == "true" + val mainClass = args(7) + + // In client deploy mode, parse the properties file for certain `spark.driver.*` configs. + // These configs encode java options, class paths, and library paths needed to launch the JVM. + val properties = + if (clientMode) { + SparkSubmitArguments.getPropertiesFromFile(new File(propertiesFile)).toMap + } else { + Map[String, String]() + } + val confDriverMemory = properties.get("spark.driver.memory") + val confClassPaths = properties.get("spark.driver.extraClassPath") + val confLibraryPaths = properties.get("spark.driver.extraLibraryPath") + val confJavaOpts = properties.get("spark.driver.extraJavaOptions") + + // Merge relevant command line values with the config equivalents, if any + val javaMemory = + if (clientMode) { + confDriverMemory.getOrElse(clJavaMemory) + } else { + clJavaMemory + } + val pathSeparator = sys.props("path.separator") + val classPaths = clClassPaths + confClassPaths.map(pathSeparator + _).getOrElse("") + val libraryPaths = clLibraryPaths + confLibraryPaths.map(pathSeparator + _).getOrElse("") + val javaOpts = clJavaOpts ++ confJavaOpts.map(Utils.splitCommandString).getOrElse(Seq.empty) + val filteredJavaOpts = javaOpts.distinct.filterNot { opt => + opt.startsWith("-Djava.library.path") || opt.startsWith("-Xms") || opt.startsWith("-Xmx") --- End diff -- does this mean if I put `--driver-memory` as a flag and I also include `spark.driver.memory` it in the config file that the config file will take precedence?
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