java.io.IOException: Could not locate executable nullinwinutils.exe in the Hadoop binaries.

问题说明：

一般来说，我编写Spark,MapReduce程序都是会在本地IDEA中进行，开发。本地跑通了，才会把代码放到集群上去跑。

当我在运行一个简单的Spark Job 的时候，控制台出现如下的错误：

java.io.IOException: Could not locate executable nullinwinutils.exe in the Hadoop binaries.

问题解决：

一看不能加载，我就感觉我的机器（Windows 10）可能是因为缺少这个winutils的文件。
我把错误放到google上一搜，方案真的多
我就找了一篇比较不错的，然后完美解决 我的问题。
具体如下：

1. Download winutils.exe from http://public-repo-1.hortonworks.com/hdp-win-alpha/winutils.exe.
   Also, be sure to download the correct winutils.exe based on the version of hadoop that spark is compiled for (so, not necessarily the link above)

2. create a folder c:hadoopin

3. add Download winutils.exe to the c:hadoopin.

4. Set environment variable HADOOP_HOME to C:hadoop.warning!set HADOOP_HOME to hadoop folder instead of the bin folder.
   OR,System.setProperty(“hadoop.home.dir”, “C:hadoop”) in your code.

参照：https://stackoverflow.com/questions/35652665/java-io-ioexception-could-not-locate-executable-null-bin-winutils-exe-in-the-ha