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.