hadoop window 配置总结

核心问题

1.是windows环境中没有配置hadoophome.配置之后加入winutils工具

https://github.com/steveloughran/winutils  推荐使用 2.7.1  不要使用2.2.0 （有很多问题）

 

a.增加用户变量HADOOP_HOME，值是下载的zip包解压的目录，

b.系统变量path里增加%HADOOP_HOME%\bin ，

c.CLASSPATH下配置%HADOOP_HOME%\bin\winutils.exe

注意配置好一定要重启

2.pom中执行的hadoop的版本与window环境中的hadoop的版本不一致

    org.apache.hadoop
    hadoop-common
    2.7.1

和上面的版本配合使用 

以下是具体的 报错方法及其细节

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

其实就是hadoop的环境变量有问题  可以看一下源码就是路径找不到为空

注意配置好一定要重启

  这里要理解的是，一个程序启动时，环境变量被复制到该程序所在的环境中，在该程序执行过程中不会被除该程序以外的其他程序所改变。也就是说，假设我们启动了一个cmd程序，然后通过控制面板修改了环境变量设置，但是已经启动了的cmd所拥有的环境变量并不会被改变。如果我们在修改环境变量之后启动cmd程序，则该程序将拥有新的环境变量。

        那么结论就很明显了：修改环境变量之后，如果受影响的是应用程序，那么只要简单地重新启动此应用程序，环境变量的修改就会反映到该程序中，而不必重新启动计算机；但是，如果受影响的是系统服务，就必须重新启动才能将环境变量的修改反映到系统服务中（因为没有办法在不重启计算机的情况下重新启动系统服务管理器）。

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com.atguigu.wordcount.WordcountDriver
2019-05-30 09:52:47,294 ERROR [org.apache.hadoop.util.Shell] - 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:356)
	at org.apache.hadoop.util.Shell.getWinUtilsPath(Shell.java:371)
	at org.apache.hadoop.util.Shell.(Shell.java:364)
	at org.apache.hadoop.util.StringUtils.(StringUtils.java:80)
	at org.apache.hadoop.security.SecurityUtil.getAuthenticationMethod(SecurityUtil.java:611)
	at org.apache.hadoop.security.UserGroupInformation.initialize(UserGroupInformation.java:272)
	at org.apache.hadoop.security.UserGroupInformation.ensureInitialized(UserGroupInformation.java:260)
	at org.apache.hadoop.security.UserGroupInformation.loginUserFromSubject(UserGroupInformation.java:790)
	at org.apache.hadoop.security.UserGroupInformation.getLoginUser(UserGroupInformation.java:760)
	at org.apache.hadoop.security.UserGroupInformation.getCurrentUser(UserGroupInformation.java:633)
	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.getInstance(Job.java:185)
	at com.atguigu.wordcount.WordcountDriver.main(WordcountDriver.java:30)
2019-05-30 09:52:47,332 WARN [org.apache.hadoop.util.NativeCodeLoader] - Unable to load native-hadoop library for your platform... using builtin-java classes where applicable
Exception in thread "main" java.lang.ArrayIndexOutOfBoundsException: 0
	at com.atguigu.wordcount.WordcountDriver.main(WordcountDriver.java:43)

Process finished with exit code 1

You are missing winutils.exe, a hadoop binary. Depending upon x64 bit / x32 bit system, download the winutils.exe file & set your hadoop home pointing to it.

1st way :

1.Download the file

2.Create hadoop folder in Your System ex " C:"

3.Create bin folder in hadoop directory ex : C:\hadoop\bin

4.paste winutils.exe in bin ex: C:\hadoop\bin\winuitls.exe

5.In User Variables in System Properties -> Advance System Settings

Create New Variable Name: HADOOP_HOME Path: C:\hadoop\

2nd Way :

You can set hadoop home directly in Your Java Program with the following Command like this :

System.setProperty("hadoop.home.dir","C:\hadoop" );

 

解决办法：

下载winutils地址https://github.com/steveloughran/winutils 下载解压

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。