Architecture and Design Document for the next generation MapReduce

I would like to know the details (archi开发者_如何学JAVAtecture and design documents) about the next generation Apache MapReduce. Where are the sources to get more information about it?

It is the only serious explanation I know: http://developer.yahoo.com/blogs/hadoop/posts/2011/02/mapreduce-nextgen/

There are a couple of Yahoo Blog entries on the next generation MapReduce Architecture.

http://developer.yahoo.com/blogs/hadoop/posts/2011/02/capacity-scheduler/

http://developer.yahoo.com/blogs/hadoop/posts/2011/02/mapreduce-nextgen/

http://developer.yahoo.com/blogs/hadoop/posts/2011/03/mapreduce-nextgen-scheduler/

then, there is a Video on YouTube at

http://www.youtube.com/watch?v=2FpO7w6X41I

The discussion on the next generation MapReduce Architecture can be found in the following JIRA

https://issues.apache.org/jira/browse/MAPREDUCE-279

How to build and run next generation MapReduce can be found at

http://svn.apache.org/repos/asf/hadoop/common/branches/MR-279/mapreduce/INSTALL

http://svn.apache.org/repos/asf/hadoop/common/branches/MR-279/mapreduce/yarn/README