【错误记录】安装 Hadoop 运行环境报错 ( Error: JAVA_HOME is incorrectly set. Please update xxx\hadoop-env.cmd )

总结 :

报错 : Error: JAVA_HOME is incorrectly set. Please update xxx\hadoop-env.cmd

JDK 安装在了 C:\Program Files\ 目录下 , 安装目录 Program Files 有空格 , 太坑了 ;

换一个没有空格的 JDK 目录 ;

一、报错信息

---

安装 Hadoop 运行环境 ,

完成上述安装步骤后 , 运行 hadoop 命令报错 ;

C:\Windows\system32>hadoop -version
The system cannot find the path specified.
Error: JAVA_HOME is incorrectly set.
     Please update D:\001_Develop\052_Hadoop\hadoop-3.3.4\etc\hadoop\hadoop-env.cmd
‘-Xmx512m’ is not recognized as an internal or external command,
operable program or batch file.

报错信息如下 :

C:\Windows\system32>hadoop -version
The system cannot find the path specified.
Error: JAVA_HOME is incorrectly set.
       Please update D:\001_Develop\052_Hadoop\hadoop-3.3.4\etc\hadoop\hadoop-env.cmd
'-Xmx512m' is not recognized as an internal or external command,
operable program or batch file.

C:\Windows\system32>hadoop -version
The system cannot find the path specified.
Error: JAVA_HOME is incorrectly set.
       Please update D:\001_Develop\052_Hadoop\hadoop-3.3.4\etc\hadoop\hadoop-env.cmd
'-Xmx512m' is not recognized as an internal or external command,
operable program or batch file.

二、问题分析

---

核心报错信息 :

Error: JAVA_HOME is incorrectly set.
     Please update D:\001_Develop\052_Hadoop\hadoop-3.3.4\etc\hadoop\hadoop-env.cmd

那就是 在 D:\001_Develop\052_Hadoop\hadoop-3.3.4\etc\hadoop\hadoop-env.cmd 文件中的 JAVA_HOME 设置错误 ;

设置内容如下 :

set JAVA_HOME=C:\Program Files\Java\jdk1.8.0_91

问题就是出在这个路径上 , 这个路径是 JDK 的实际路径 ;

但是路径中出现一个空格 , 这就导致了运行 Hadoop 报错 ;

三、解决方案

---

换一个没有空格的 JDK :

set JAVA_HOME=D:\001_Develop\031_Java8u144_Frida\jdk1.8.0_144

再次运行

hadoop -version

命令 , 此时 Hadoop 运行成功 ;

C:\Windows\system32>hadoop -version
java version "1.8.0_144"
Java(TM) SE Runtime Environment (build 1.8.0_144-b01)
Java HotSpot(TM) Client VM (build 25.144-b01, mixed mode)

运行

hadoop

命令 , 可以正确运行 ;

C:\Windows\system32>hadoop
Usage: hadoop [--config confdir] [--loglevel loglevel] COMMAND
where COMMAND is one of:
  fs                   run a generic filesystem user client
  version              print the version
  jar <jar>            run a jar file
                       note: please use "yarn jar" to launch
                             YARN applications, not this command.
  checknative [-a|-h]  check native hadoop and compression libraries availability
  conftest             validate configuration XML files
  distch path:owner:group:permisson
                       distributed metadata changer
  distcp <srcurl> <desturl> copy file or directories recursively
  archive -archiveName NAME -p <parent path> <src>* <dest> create a hadoop archive
  classpath            prints the class path needed to get the
                       Hadoop jar and the required libraries
  credential           interact with credential providers
  jnipath              prints the java.library.path
  kerbname             show auth_to_local principal conversion
  kdiag                diagnose kerberos problems
  key                  manage keys via the KeyProvider
  trace                view and modify Hadoop tracing settings
  daemonlog            get/set the log level for each daemon
 or
  CLASSNAME            run the class named CLASSNAME

Most commands print help when invoked w/o parameters.