WIN7下运行hadoop程序报：Failed to locate the winutils binary in the hadoop binary path

    之前在mac上调试hadoop程序（mac之前配置过hadoop环境）一直都是正常的。因为工作需要，需要在windows上先调试该程序，然后再转到linux下。程序运行的过程中，报Failed to locate the winutils binary in the hadoop binary path  java.io.IOException: Could not locate executable null\bin\winutils.exe in the Hadoop binaries.

　　通过断点调试、查看源码发现程序需要根据HADOOP_HOME找到winutils.exe,由于win机器并没有配置该环境变量，所以程序报 null\bin\winutils.exe。

 

 private static String checkHadoopHome() {

    // first check the Dflag hadoop.home.dir with JVM scope

    String home = System.getProperty("hadoop.home.dir");



    // fall back to the system/user-global env variable

    if (home == null) {

      home = System.getenv("HADOOP_HOME");

    }

    try {

       // couldn't find either setting for hadoop's home directory

       if (home == null) {

         throw new IOException("HADOOP_HOME or hadoop.home.dir are not set.");

       }

       if (home.startsWith("\"") && home.endsWith("\"")) {

         home = home.substring(1, home.length()-1);

       }

       // check that the home setting is actually a directory that exists

       File homedir = new File(home);

       if (!homedir.isAbsolute() || !homedir.exists() || !homedir.isDirectory()) {

         throw new IOException("Hadoop home directory " + homedir

           + " does not exist, is not a directory, or is not an absolute path.");

       }

       home = homedir.getCanonicalPath();

    } catch (IOException ioe) {

      if (LOG.isDebugEnabled()) {

        LOG.debug("Failed to detect a valid hadoop home directory", ioe);

      }

      home = null;

    }    

    return home;

  }

　　private static String HADOOP_HOME_DIR = checkHadoopHome();

public static final String getQualifiedBinPath(String executable) 

  throws IOException {

    // construct hadoop bin path to the specified executable

    String fullExeName = HADOOP_HOME_DIR + File.separator + "bin" 

      + File.separator + executable;



    File exeFile = new File(fullExeName);

    if (!exeFile.exists()) {

      throw new IOException("Could not locate executable " + fullExeName

        + " in the Hadoop binaries.");

    }

    return exeFile.getCanonicalPath();

  }



  /** a Windows utility to emulate Unix commands */

  public static final String WINUTILS = getWinUtilsPath();



  public static final String getWinUtilsPath() {

    String winUtilsPath = null;



    try {

      if (WINDOWS) {

        winUtilsPath = getQualifiedBinPath("winutils.exe");

      }

    } catch (IOException ioe) {

       LOG.error("Failed to locate the winutils binary in the hadoop binary path",

         ioe);

    }



    return winUtilsPath;

  }

　　找到原因后就去网上问了度娘，找到了解决方案，很简单，如下：

　　1.下载winutils的windows版本

　　GitHub上，有人提供了winutils的windows的版本，项目地址是：https://github.com/srccodes/hadoop-common-2.2.0-bin,直接下载此项目的zip包，下载后是文件名是hadoop-common-2.2.0-bin-master.zip,随便解压到一个目录

　　2.配置环境变量

　　增加用户变量HADOOP_HOME，值是下载的zip包解压的目录，然后在系统变量path里增加$HADOOP_HOME\bin 即可。　　

　　再次运行程序，正常执行。