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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 03:08:16 GMT
Github user andrewor14 commented on a diff in the pull request:

    https://github.com/apache/spark/pull/3916#discussion_r22841076
  
    --- 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"));
    +    if (javaOpts.isFile()) {
    +      BufferedReader br = new BufferedReader(new InputStreamReader(
    +          new FileInputStream(javaOpts), "UTF-8"));
    +      try {
    +        String line;
    +        while ((line = br.readLine()) != null) {
    +          addOptionString(cmd, line);
    +        }
    +      } finally {
    +        br.close();
    +      }
    +    }
    +
    +    return cmd;
    +  }
    +
    +  protected void addOptionString(List<String> cmd, String options) {
    +    if (!isEmpty(options)) {
    +      for (String opt : parseOptionString(options)) {
    +        cmd.add(opt);
    +      }
    +    }
    +  }
    +
    +  /**
    +   * Builds the classpath for the application. Returns a list with one classpath entry
per element;
    +   * each entry is formatted in the way expected by <i>java.net.URLClassLoader</i>
(more
    +   * specifically, with trailing slashes for directories).
    +   */
    +  protected List<String> buildClassPath(String appClassPath) throws IOException
{
    +    String sparkHome = getSparkHome();
    +    String scala = getScalaVersion();
    +
    +    List<String> cp = new ArrayList<String>();
    +    addToClassPath(cp, getenv("SPARK_CLASSPATH"));
    +    addToClassPath(cp, appClassPath);
    +
    +    String confDir = getenv("SPARK_CONF_DIR");
    +    if (!isEmpty(confDir)) {
    +      addToClassPath(cp, confDir);
    +    } else {
    +      addToClassPath(cp, join(File.separator, getSparkHome(), "conf"));
    +    }
    +
    +    boolean prependClasses = !isEmpty(getenv("SPARK_PREPEND_CLASSES"));
    +    boolean isTesting = "1".equals(getenv("SPARK_TESTING"));
    +    if (prependClasses || isTesting) {
    +      List<String> projects = Arrays.asList("core", "repl", "mllib", "bagel", "graphx",
    +        "streaming", "tools", "sql/catalyst", "sql/core", "sql/hive", "sql/hive-thriftserver",
    +        "yarn", "launcher");
    +      if (prependClasses) {
    +        System.err.println(
    +          "NOTE: SPARK_PREPEND_CLASSES is set, placing locally compiled Spark classes
ahead of " +
    +          "assembly.");
    +        for (String project : projects) {
    +          addToClassPath(cp, String.format("%s/%s/target/scala-%s/classes", sparkHome,
project,
    +            scala));
    +        }
    +      }
    +      if (isTesting) {
    +        for (String project : projects) {
    +          addToClassPath(cp, String.format("%s/%s/target/scala-%s/test-classes", sparkHome,
    +            project, scala));
    +        }
    +      }
    +      addToClassPath(cp, String.format("%s/core/target/jars/*", sparkHome));
    +    }
    +
    +    String assembly = findAssembly(scala);
    +    addToClassPath(cp, assembly);
    +
    +    // When Hive support is needed, Datanucleus jars must be included on the classpath.
Datanucleus
    +    // jars do not work if only included in the uber jar as plugin.xml metadata is lost.
Both sbt
    +    // and maven will populate "lib_managed/jars/" with the datanucleus jars when Spark
is built
    +    // with Hive, so first check if the datanucleus jars exist, and then ensure the current
Spark
    +    // assembly is built for Hive, before actually populating the CLASSPATH with the
jars.
    +    //
    +    // This block also serves as a check for SPARK-1703, when the assembly jar is built
with
    +    // Java 7 and ends up with too many files, causing issues with other JDK versions.
    +    boolean needsDataNucleus = false;
    +    JarFile assemblyJar = null;
    +    try {
    +      assemblyJar = new JarFile(assembly);
    +      needsDataNucleus = assemblyJar.getEntry("org/apache/hadoop/hive/ql/exec/") != null;
    +    } catch (IOException ioe) {
    +      if (ioe.getMessage().indexOf("invalid CEN header") > 0) {
    +        System.err.println(
    +          "Loading Spark jar with '$JAR_CMD' failed.\n" +
    +          "This is likely because Spark was compiled with Java 7 and run\n" +
    +          "with Java 6 (see SPARK-1703). Please use Java 7 to run Spark\n" +
    +          "or build Spark with Java 6.");
    +        System.exit(1);
    +      } else {
    +        throw ioe;
    +      }
    +    } finally {
    +      if (assemblyJar != null) {
    +        try {
    +          assemblyJar.close();
    +        } catch (IOException e) {
    +          // Ignore.
    +        }
    +      }
    +    }
    +
    +    if (needsDataNucleus) {
    +      System.err.println("Spark assembly has been built with Hive, including Datanucleus
jars " +
    +        "in classpath.");
    +      File libdir;
    +      if (new File(sparkHome, "RELEASE").isFile()) {
    +        libdir = new File(sparkHome, "lib");
    +      } else {
    +        libdir = new File(sparkHome, "lib_managed/jars");
    +      }
    +
    +      checkState(libdir.isDirectory(), "Library directory '%s' does not exist.",
    +        libdir.getAbsolutePath());
    --- End diff --
    
    bump up 1 line


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