All, I've fixed the issues that Allen observed in the previous rc for 0.20.204 and rolled the new bundled up in http://people.apache.org/~omalley/hadoop-0.20.204.0-rc3 . Please download the tarball, compile it, and try it out. All of the tests pass, and I've run several 1TB sorts with 15,000 maps and 110 reduces with only 1 task failures out of 3 runs.
Thanks, Owen