The hadoop upgrade wiki page contains a small typo http://wiki.apache.org/hadoop/Hadoop_Upgrade .
Step 2 of the instructions is: bin/hadoop fsck / -files –blocks –locations > dfs-v-old-fsck-1.log Notice that there are dashes of some sort before "blocks" and "locations". These should be hyphens (minus signs). I don't have access to modify it, but someone else might like to. - Marc
