Hadoop报错 Failed to locate the winutils binary in the hadoop

                1 发现问题

在虚拟机中搭建了hadoop集群，在windows中通过代码访问报错

15/06/11 15:35:50 ERROR Shell: Failed to locate the winutils binary in the hadoop binary pathjava.io.IOException: Could not locate executable null\bin\winutils.exe in the Hadoop binaries.    at org.apache.hadoop.util.Shell.getQualifiedBinPath(Shell.java:356)    at org.apache.hadoop.util.Shell.getWinUtilsPath(Shell.java:371)    at org.apache.hadoop.util.Shell.<clinit>(Shell.java:364)
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2 分析问题
打开源码，查看getQualifiedBinPath方法

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");    }     ...}
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exeFile不存在会报错，也就是fullExeName不存在。即windows中没有配置HADOOP_HOME。

3 解决问题
配置环境变量E:\\Program Files\\hadoop-2.7.0重启电脑。 或者代码中设置System.setProperty("hadoop.home.dir", "E:\\Program Files\\hadoop-2.7.0"); 还有一种可能HADOOP_HOME的bin目录下根本没有winutils.exe，下载地址https://github.com/srccodes/hadoop-common-2.2.0-bin

原贴地址：http://www.cnblogs.com/hyl8218/p/5492450.html