What hadoop that? (One)
History of hadoop (b)
Hadoop three releases (c)
Hadoop three major releases: Apache, Cloudera, Hortonworks.
Most of the original Apache version (most basic) version, for best learning portal.
Cloudera used in many large Internet companies.
Hortonworks document better.
- Apache Hadoop
Official website address: http: //hadoop.apache.org/releases.html
Download: https://archive.apache.org/dist/hadoop/common/
- Cloudera Hadoop
Official website address: https: //www.cloudera.com/downloads/cdh/5-10-0.html
Download: http: //archive-primary.cloudera.com/cdh5/cdh/5/
(1) established in 2008 Cloudera Hadoop is the first commercial company to provide commercial Hadoop solutions for partners, mainly including support, consulting services, training.
( 2 ) 2009 Nian Hadoop founder Doug Cutting also joined the Cloudera company . Cloudera products are mainly for CDH, Cloudera Manager, Cloudera Support
(3) CDH is Cloudera Hadoop distribution, fully open source than Apache Hadoop has been enhanced in the compatibility, security, stability.
（4）Cloudera Manager是集群的软件分发及管理监控平台，可以在几个小时内部署好一个Hadoop集群，并对集群的节点及服务进行实时监控。Cloudera Support即是对Hadoop的技术支持。
（5）Cloudera的标价为每年每个节点4000美元。Cloudera开发并贡献了可实时处理大数据的Impala项目。
3. Hortonworks Hadoop
官网地址：https://hortonworks.com/products/data-center/hdp/
下载地址：https://hortonworks.com/downloads/#data-platform
（1）2011年成立的Hortonworks是雅虎与硅谷风投公司Benchmark Capital合资组建。
（2）公司成立之初就吸纳了大约25名至30名专门研究Hadoop的雅虎工程师，上述工程师均在2005年开始协助雅虎开发Hadoop，贡献了Hadoop80%的代码。
（3）雅虎工程副总裁、雅虎Hadoop开发团队负责人Eric Baldeschwieler出任Hortonworks的首席执行官。
（4）Hortonworks的主打产品是Hortonworks Data Platform（HDP），也同样是100%开源的产品，HDP除常见的项目外还包括了Ambari，一款开源的安装和管理系统。
（5）HCatalog，一个元数据管理系统，HCatalog现已集成到Facebook开源的Hive中。Hortonworks的Stinger开创性的极大的优化了Hive项目。Hortonworks为入门提供了一个非常好的，易于使用的沙盒。
（6）Hortonworks开发了很多增强特性并提交至核心主干，这使得Apache Hadoop能够在包括Window Server和Windows Azure在内的Microsoft Windows平台上本地运行。定价以集群为基础，每10个节点每年为12500美元
hadoop四大特性（四）
