This is the alpha version of the hadoop-0.23 major release. This is the first release we’ve made off Apache Hadoop trunk in a long while. This release is alpha-quality and not yet ready for serious use.
hadoop-0.23 contains several major advances:
It also has several major performance improvements to both HDFS and MapReduce.
See the Hadoop 0.23.0 Release Notes for details.
2011 Nov 11