There are two major release lines: 1.x and 2.x.
1.x is deemed stable and 2.x is considered alpha quality.
0.23.* is the last of 0.2X line. 0.23.* is used mostly by Yahoo! to stabilize the last code minus some features present in 2.x like some HDFS HA work, PB use in RPC layer etc.
On Oct 31, 2012, at 10:25 AM, Pedro Sá da Costa wrote:
> I've noticed that Hadoop MapReduce 1.0.4 was released in 12 October 2012, and Hadoop 0.23.4 was released in 15 October 2012. I thought that with Hadoop 1.0, the Hadoop 0.2X had become discontinued. If I want to start to use Hadoop MapReduce, which version should I use?
> What's the difference between Hadoop MapReduce 0.2X and Hadoop MapReduce 1.0?
> Best regards,