Apache Hadoop 2.1.0-beta is the beta release of Apache Hadoop 2.x.
Users are encouraged to immediately move to 2.1.0-beta since this release is significantly more stable and has completley whetted set of APIs and wire-protocols for future compatibility.
In addition, this release has a number of other significant highlights:
Please see the Hadoop 2.1.0-beta Release Notes for details.
2013 Aug 25