java.io.IOException: Could not locate executable null\bin\winutils.exe in the Hadoop binaries.

java.io.IOException: Could not locate executable null\bin\winutils.exe in the Hadoop binaries.

搭建好Hadoop集群后写java程序测试确出现如下异常:

2017-03-10 11:48:49,887 ERROR [main] util.Shell (Shell.java:getWinUtilsPath(397)) - 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.
	at org.apache.hadoop.util.Shell.getQualifiedBinPath(Shell.java:379)
	at org.apache.hadoop.util.Shell.getWinUtilsPath(Shell.java:394)
	at org.apache.hadoop.util.Shell.(Shell.java:387)
	at org.apache.hadoop.util.StringUtils.(StringUtils.java:80)
	at org.apache.hadoop.security.SecurityUtil.getAuthenticationMethod(SecurityUtil.java:610)
	at org.apache.hadoop.security.UserGroupInformation.initialize(UserGroupInformation.java:273)
	at org.apache.hadoop.security.UserGroupInformation.ensureInitialized(UserGroupInformation.java:261)
	at org.apache.hadoop.security.UserGroupInformation.loginUserFromSubject(UserGroupInformation.java:791)
	at org.apache.hadoop.security.UserGroupInformation.getLoginUser(UserGroupInformation.java:761)
	at org.apache.hadoop.security.UserGroupInformation.getCurrentUser(UserGroupInformation.java:634)
	at org.apache.hadoop.mapreduce.task.JobContextImpl.(JobContextImpl.java:72)
	at org.apache.hadoop.mapreduce.Job.(Job.java:142)
	at org.apache.hadoop.mapreduce.Job.(Job.java:129)
	at com.sct.hadoop.mapreduce.Temperature.main(Temperature.java:106)

查看hadoop源码发现里有这么一段：

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();
  }
 
private static String HADOOP_HOME_DIR = checkHadoopHome();
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");
    }
     ...
}

很明显应该是HADOOP_HOME的问题。如果HADOOP_HOME为空，必然fullExeName为null\bin\winutils.exe。解决方法很简单，配置环境变量，不想重启电脑可以在程序里加上：
 System.setProperty("hadoop.home.dir", "C:\\Users\\Administrator\\Desktop\\hadoop-2.7.3\\hadoop-2.7.3");


不过直接这样还是不行,因为Hadoop-2.7.3/bin下面还是没有winutils.exe这个文件
于是我告诉你，你可以去github下载一个，地球人都知道的地址发你一个。


地址：https://github.com/srccodes/hadoop-common-2.2.0-bin


不要顾虑它的版本，不用怕，因为我用的最新的hadoop-2.7.0都没问题！下载好后，把winutils.exe加入你的hadoop-x.x.x/bin下。


重新运行程序就OK了