如何下载oracle_jdbc驱动程序：
3358 www.Oracle.com/tech network/database/enterprise-edition/JDBC-112010-090769.html
如何下载硬件文档：
下载hadoop-x.x.x.tar.gz，解压后的share/doc目录就是它。 3359堆栈覆盖.com/questions/28186507/how-to-download-Hadoop-documentation-of-specific-version
findoutthelinksoftheversionsyouneedtodownloadfrom
3359 SVN.Apache.org/repos/ASF/Hadoop/common/site/main/publish/docs/dosvncheckout，Example
SVN check out https://SVN.Apache.org/repos/ASF/Hadoop/common/site/main/publish/docs/r2.5.2/