按照what、how、why整理了下文章，帮助大家快速梳理下hadoop知识：
what:
Hadoop的作用： http://tianhailong.com/hadoop%E7%9A%84%E4%BD%9C%E7%94%A8.html
hadoop到底能做什么？怎么用hadoop？: http://tianhailong.com/hadoop%E5%88%B0%E5%BA%95%E8%83%BD%E5%81%9A%E4%BB%80%E4%B9%88%EF%BC%9F%E6%80%8E%E4%B9%88%E7%94%A8hadoop%EF%BC%9F.html
Hadoop和云计算的关系: http://tianhailong.com/hadoop%E5%92%8C%E4%BA%91%E8%AE%A1%E7%AE%97%E7%9A%84%E5%85%B3%E7%B3%BB.html
hadoop和java的关系: http://tianhailong.com/hadoop%E5%92%8Cjava%E7%9A%84%E5%85%B3%E7%B3%BB.html
Hadoop10大应用: http://tianhailong.com/hadoop10%E5%A4%A7%E5%BA%94%E7%94%A8.html
Hadoop是分布式计算的未来： http://tianhailong.com/187.html
Hadoop发展历史: http://tianhailong.com/hadoop%E5%8F%91%E5%B1%95%E5%8E%86%E5%8F%B2.html
Hadoop大事记： http://tianhailong.com/hadoop%E5%A4%A7%E4%BA%8B%E8%AE%B0.html
Hadoop主要子项目: http://tianhailong.com/hadoop%E4%B8%BB%E8%A6%81%E5%AD%90%E9%A1%B9%E7%9B%AE.html
Hadoop, Hive和Scribe在运维方面的应用: http://tianhailong.com/hadoop-hive%E5%92%8Cscribe%E5%9C%A8%E8%BF%90%E7%BB%B4%E6%96%B9%E9%9D%A2%E7%9A%84%E5%BA%94%E7%94%A8.html
hadoop招聘： http://tianhailong.com/hadoop%E6%8B%9B%E8%81%98.html
how:
渐进学习hadoop: http://tianhailong.com/%E6%B8%90%E8%BF%9B%E5%AD%A6%E4%B9%A0hadoop.html
hadoop基础-Hadoop入门一： http://tianhailong.com/hadoop%E5%9F%BA%E6%9C%AC%E7%9F%A5%E8%AF%86%E7%82%B9.html
认识hdfs和MapReduce-Hadoop入门二： http://tianhailong.com/hadoop%E5%85%A5%E9%97%A8%E5%9F%BA%E6%9C%AC%E7%9F%A5%E8%AF%86%E7%82%B9%E4%BA%8C.html
HDFS开发MapReduce开发-Hadoop入门三： http://tianhailong.com/hadoop%E5%85%A5%E9%97%A8%E5%9F%BA%E6%9C%AC%E7%9F%A5%E8%AF%86%E7%82%B9%E4%B8%89.html
hadoop在百度的应用： http://tianhailong.com/hadoop%E5%9C%A8%E7%99%BE%E5%BA%A6%E7%9A%84%E5%BA%94%E7%94%A8.html
Hadoop集群搭建–Hadoop安装： http://tianhailong.com/hadoop%E9%9B%86%E7%BE%A4%E6%90%AD%E5%BB%BAhadoop%E5%AE%89%E8%A3%85.html
why:
hdfs：hadoop分布式文件系统的架构和设计： http://tianhailong.com/hdfs%EF%BC%9Ahadoop%E5%88%86%E5%B8%83%E5%BC%8F%E6%96%87%E4%BB%B6%E7%B3%BB%E7%BB%9F%E7%9A%84%E6%9E%B6%E6%9E%84%E5%92%8C%E8%AE%BE%E8%AE%A1.html