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  • Windows7系统运行hadoop报Failed to locate the winutils binary in the hadoop binary path错误

    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 executableinwinutils.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 nullinwinutils.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 variableif (home == null) {
          home = System.getenv("HADOOP_HOME");
        }
        try {
           // couldn't find either setting for hadoop's home directoryif (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()) {
             thrownew 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 */publicstaticfinal 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_HOMEin 即可。  

      再次运行程序,正常执行。

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  • 原文地址:https://www.cnblogs.com/itboys/p/6675153.html
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