An excellent summary from Tom White on the release 0.21 of Hadoop
http://www.cloudera.com/blog/2010/08/what%e2%80%99s-new-in-apache-hadoop-0-21/
Having the distributed cache and parallel mappers with the LocalJobRunner is very good news for Behemoth as we need it to distribute the resources to all the nodes. This should make it easier to test in local mode.
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