Google paper <http://portal.acm.org/citation.cfm?id=1806596.1806638> (requires ACM membership) on their internal, higher-level java map/reduce api.
Also of note, Jeff Hammerbacher seems to agree with me that this would be *awesome* for Hadoop-land: https://issues.apache.org/jira/browse/MAPREDUCE-1849 Thoughts? I may just try to dredge up my initial pass at this kind of thing (essentially a generified version of DistributedRowMatrix - DataSet<K,V>, which then accepts Map<K,V,KOUT,VOUT> mappers and various reducers etc...), and see if I can help with this. -jake
