在独立模式下执行hadoop示例时，权限被拒绝

Question

我正在尝试在独立模式下运行hadoop。当我尝试执行

命令时

bin/hadoop jar hadoop-mapred-examples-0.21.0.jar grep input output

我得到以下错误:

laxmikant@laxmikant-Inspiron-1464:~/Work/hadoop-0.21.0$ bin/hadoop jar hadoop-mapred-  examples-0.21.0.jar grep input output
/home/laxmikant/Work/hadoop-0.21.0/bin/hadoop-config.sh: line 189:     /home/laxmikant/java/jdk1.7.0_04/bin/java: Permission denied
bin/hadoop: line 120: /home/laxmikant/java/jdk1.7.0_04/bin/java: Permission denied
bin/hadoop: line 120: exec: /home/laxmikant/java/jdk1.7.0_04/bin/java: cannot execute:     Permission denied

如何删除错误?

Answer 1

运行hadoop的用户似乎没有运行java的权限。但是通过查看java二进制文件所在的路径(/home/laxmikant/java/)，它应该很容易被用户laxmikant或root用户访问。因此，如果您试图以用户laxmikant的身份执行它，但仍然得到错误，那么，可能没有正确安装Java。还要确保在hadoop的conf/hadoop-env.sh中正确设置JAVA_HOME。