http://hadoop.apache.org/ Download Hadoop from the release page. http://hadoop.apache.org/releases.html Download a release now! http://www.apache.org/dyn/closer.cgi/hadoop/common/
We suggest the following mirror site for your download:他会推荐一个镜像站点（如果这个不好可以换其他的）
cdh有两个大的发行版：
http://archive-primary.cloudera.com/cdh4/cdh/4/
http://archive-primary.cloudera.com/cdh5/cdh/5/
