As of the last release, Hadoop 2.2 supports Windows natively. Thus, old
workarounds like Cygwin are now un-supported. Please refer to the new
documentation mentioned below (and copied here) for latest instructions
for Hadoop on Windows.https://wiki.apache.org/hadoop/Hadoop2OnWindows
If you are running Hadoop 1, then please check out branch-1-win and use
that for running Hadoop 1 natively on Windows.