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I'm curious why Google isn't on the list?

Hadoop is basically a clean room implementation of MapReduce and GFS anyway, to the point where Google graciously offered Apache a liberal patent license just to make sure Hadoop users didn't worry about Google coming after them when their patents came through on this stuff.

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Probably because Google clearly has prior art.

The initial white papers about Google Filesystem were presented in 2003: http://dl.acm.org/citation.cfm?id=945450

One of the patents was filed in 2002, so 2003 is not early enough to be prior art.

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