这是我的2美分。我有同样的问题，我重新安装hadoop在unix环境中，它工作正常。 Cygwin有一些奇怪的问题，hadoop加窗口不是hadoop的好平台。

Here is my 2 cents. I had the same issue, I re-installed hadoop in a unix environment and it worked fine. Cygwin has some weird issues with hadoop plus windows is not a good platform for hadoop.