Minor Description
The hadoop streaming command will ignore any command line arguments to it.
hadoop jar streaming.jar -input input -output output -mapper cat -reducer cat ThisIsABadArgument
Works just fine. This can mask issues where quotes were mistakenly missed like
hadoop jar streaming.jar -input input -output output -mapper xargs cat -reducer cat -archive someArchive.tgz
Streaming should fail if it encounters an unexpected command line parameter