刚用Ambari搭建好Hadoop,就开始写Hello World! 一、背景 1、Hadoop版本 经查看为2.7.1 [root@TJ1-000 ~]# hadoop version Hadoop 2.7.1.2.4.0.0-169 Subversion git@github.com:hortonworks/hadoop.git -r 26104d8ac833884c8776473823007f176854f2eb Compiled by jenkins on 2016-02-10T06:18Z Compile…