1 centos下载地址: http://wiki.centos.org/Download
2 jdk下载地址: http://www.oracle.com/technetwork/java/javase/downloads/jdk7-downloads-1880260.html
3 hadoop2.5 下载地址: http://mirror.bit.edu.cn/apache/hadoop/common/hadoop-2.5.2/
4 hadoop各种版本文档地址: http://hadoop.apache.org/docs/ 进入个版本后 找左侧 API docs 如下: