hadoop:跑网上的伪分布式wordcount出现问题

[xph4444]

http://www.ibm.com/developerworks/cn/op ... index.html

前一天头几次跑这个伪分布式wordcount的时候都成功了，可是第二天再做的时候居然失败了！

当做到 $ bin/hadoop dfs -put ./test-in input 这一步时 会提示以下信息：


09/02/02 11:18:59 INFO ipc.Client: Retrying connect to server: localhost/127.0.0.1:9000. Already tried 1 time(s).
09/02/02 11:19:00 INFO ipc.Client: Retrying connect to server: localhost/127.0.0.1:9000. Already tried 2 time(s).
09/02/02 11:19:01 INFO ipc.Client: Retrying connect to server: localhost/127.0.0.1:9000. Already tried 3 time(s).
09/02/02 11:19:02 INFO ipc.Client: Retrying connect to server: localhost/127.0.0.1:9000. Already tried 4 time(s).
09/02/02 11:19:04 INFO ipc.Client: Retrying connect to server: localhost/127.0.0.1:9000. Already tried 5 time(s).
09/02/02 11:19:05 INFO ipc.Client: Retrying connect to server: localhost/127.0.0.1:9000. Already tried 6 time(s).
09/02/02 11:19:06 INFO ipc.Client: Retrying connect to server: localhost/127.0.0.1:9000. Already tried 7 time(s).
09/02/02 11:19:07 INFO ipc.Client: Retrying connect to server: localhost/127.0.0.1:9000. Already tried 8 time(s).
09/02/02 11:19:08 INFO ipc.Client: Retrying connect to server: localhost/127.0.0.1:9000. Already tried 9 time(s).
09/02/02 11:19:09 INFO ipc.Client: Retrying connect to server: localhost/127.0.0.1:9000. Already tried 10 time(s).
Bad connection to FS. command aborted

请问到底是怎么回事?
我在firestarter防火墙打开和关闭的情况下都不能成功。
而且我发现当输入java -version后并不会出现java 的信息，而是出现以下信息：

......（省略）
bash: java: command not found


但是以前都不会的，可我什么信息都没有修改呀

[xge.ustc]

3个配置文件中，用localhost
master slaves中也用localhost
hadoop-env.sh中配置好java环境变量

[blueprince0817]

同样的问题，顶起，求解

[andywang0723]

防火墙没有开 sudo ufw disable