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[2015-02-05] Hadoop 2
All Releases: http://hadoop.apache.org/releases.html
V2.2.0: GA version (Alpha->Beta->RC(Release Candidate, no more features)->GA(General Availability)->Release),
V2.5.2: Latest stable (2.5.2 is a point release in the 2.5.x release line, and fixes a few critical issues in 2.5.1) ,
V2.6.0: Latest version, but it contains many beta enhancements.
V2.5.2, Download: http://www.us.apache.org/dist/hadoop/common/hadoop-2.5.2/
Release Notes(2.5.0):http://hadoop.apache.org/docs/r2.5.0/hadoop-project-dist/hadoop-common/releasenotes.html
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原文地址：http://www.cnblogs.com/vscn/p/4275111.html
