Github user andrewor14 commented on a diff in the pull request: https://github.com/apache/spark/pull/3916#discussion_r22840815 --- Diff: launcher/src/main/java/org/apache/spark/launcher/AbstractLauncher.java --- @@ -0,0 +1,600 @@ +/* + * 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.Enumeration; +import java.util.HashMap; +import java.util.List; +import java.util.Map; +import java.util.Properties; +import java.util.jar.JarEntry; +import java.util.jar.JarFile; +import java.util.regex.Pattern; + +/** + * Basic functionality for launchers. + */ +public abstract class AbstractLauncher<T extends AbstractLauncher> extends LauncherCommon { + + protected static final String DEFAULT_MEM = "512m"; + + protected String javaHome; + protected String sparkHome; + protected String propertiesFile; + protected final Map<String, String> conf = new HashMap<String, String>(); + private final Map<String, String> env; + + protected AbstractLauncher() { + this(null); + } + + protected AbstractLauncher(Map<String, String> env) { + this.env = env; + } + + @SuppressWarnings("unchecked") + private final T THIS = (T) this; + + /** Set a custom JAVA_HOME for launching the Spark application. */ + public T setJavaHome(String path) { + checkNotNull(path, "path"); + this.javaHome = path; + return THIS; + } + + /** Set a custom Spark installation location for the application. */ + public T setSparkHome(String path) { + checkNotNull(path, "path"); + this.sparkHome = path; + return THIS; + } + + /** Set a custom properties file with Spark configuration for the application. */ + public T setPropertiesFile(String path) { + checkNotNull(path, "path"); + this.propertiesFile = path; + return THIS; + } + + /** Set a single configuration value for the application. */ + public T setConf(String key, String value) { + checkNotNull(key, "key"); + checkNotNull(value, "value"); + checkArgument(key.startsWith("spark."), "'key' must start with 'spark.'"); + conf.put(key, value); + return THIS; + } + + /** + * Launchers should implement this to create the command to be executed. + */ + protected abstract List<String> buildLauncherCommand() throws IOException; + + protected Properties loadPropertiesFile() throws IOException { + Properties props = new Properties(); + File propsFile; + if (propertiesFile != null) { + propsFile = new File(propertiesFile); + checkArgument(propsFile.isFile(), "Invalid properties file '%s'.", propertiesFile); + } else { + String confDir = getenv("SPARK_CONF_DIR"); + if (confDir == null) { + confDir = join(File.separator, getSparkHome(), "conf"); + } + propsFile = new File(confDir, "spark-defaults.conf"); + } + + if (propsFile.isFile()) { + FileInputStream fd = null; + try { + fd = new FileInputStream(propsFile); + props.load(new InputStreamReader(fd, "UTF-8")); + } finally { + if (fd != null) { + try { + fd.close(); + } catch (IOException e) { + // Ignore. + } + } + } + } + + return props; + } + + protected String getSparkHome() { + String path = first(sparkHome, getenv("SPARK_HOME")); + checkState(path != null, + "Spark home not found; set it explicitly or use the SPARK_HOME environment variable."); + return path; + } + + protected List<String> createJavaCommand() throws IOException { + List<String> cmd = new ArrayList<String>(); + if (javaHome == null) { + cmd.add(join(File.separator, System.getProperty("java.home"), "..", "bin", "java")); + } else { + cmd.add(join(File.separator, javaHome, "bin", "java")); + } + + // Don't set MaxPermSize for Java 8 and later. + String[] version = System.getProperty("java.version").split("\\."); + if (Integer.parseInt(version[0]) == 1 && Integer.parseInt(version[1]) < 8) { + cmd.add("-XX:MaxPermSize=128m"); + } + + // Load extra JAVA_OPTS from conf/java-opts, if it exists. + File javaOpts = new File(join(File.separator, getSparkHome(), "conf", "java-opts")); --- End diff -- should this consider `SPARK_CONF_DIR`?
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