记得从0.1版本就使用过，当时还是用的是Apache Hadoop，现在都已经有自己的增强版本了，真的不错。
HDFS – Self healing distributed file system
MapReduce – Powerful, parallel data processing framework
Hadoop Common – a set of utilities that support the Hadoop subprojects
HBase – Hadoop database for random read/write access
Hive – SQL-like queries and tables on large datasets
Pig – Dataflow language and compiler
Oozie – Workflow for interdependent Hadoop jobs
Sqoop – Integrate databases and data warehouses with Hadoop
Flume – Highly reliable, configurable streaming data collection
Zookeeper – Coordination service for distributed applications
Hue – User interface framework and SDK for visual Hadoop applications
下载：http://www.cloudera.com/downloads/
Hadoop 介绍：http://www.sfbayacm.org/wp/wp-content/uploads/2010/01/amr-hadoop-acm-dm-sig-jan2010.pdf