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From andrewor14 <...@git.apache.org>
Subject [GitHub] spark pull request: [SPARK-4924] Add a library for launching Spark...
Date Tue, 13 Jan 2015 02:46:05 GMT
Github user andrewor14 commented on a diff in the pull request:

    https://github.com/apache/spark/pull/3916#discussion_r22840454
  
    --- 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");
    --- End diff --
    
    could you make `spark-defaults.conf` a static variable `DEFAULT_PROPERTIES_FILE` or something


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