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GA release of Apache Hadoop 2.x

Apache Hadoop 2.2.0 is the GA release of Apache Hadoop 2.x.
Users are encouraged to immediately move to 2.2.0 since this release is significantly more stable and is guaranteed to remain compatible in terms of both APIs and protocols.
To recap, this release has a number of significant highlights compared to Hadoop 1.x:
A couple of important points to note while upgrading to hadoop-2.2.0:
Please see the Hadoop 2.2.0 Release Notes for details.