windows下跑伪分布hadoop，问题小记
问题目录表：1，Bad connection to FS. command aborted. exception: Call to localhost/127.0.0.1:8888
failed on connection exception: java.net.ConnectException: Connection refused
2，Bad connection to FS. command aborted.
3，在cygwin上执行wordcount时报FileNotFoundException
1， windows下，在安装完cygwin，并配置好hadoop参数，到hadoop的bin目录下执行以下代码，
$ ./hadoop fs -ls /
遇到错误：
11/08/18 14:56:37 INFO ipc.Client: Retrying connect to server: localhost/127.0.0
.1:8888. Already tried 0 time(s).
11/08/18 14:56:39 INFO ipc.Client: Retrying connect to server: localhost/127.0.0
.1:8888. Already tried 1 time(s).
11/08/18 14:56:41 INFO ipc.Client: Retrying connect to server: localhost/127.0.0
.1:8888. Already tried 2 time(s).
11/08/18 14:56:43 INFO ipc.Client: Retrying connect to server: localhost/127.0.0
.1:8888. Already tried 3 time(s).
11/08/18 14:56:45 INFO ipc.Client: Retrying connect to server: localhost/127.0.0
.1:8888. Already tried 4 time(s).
11/08/18 14:56:47 INFO ipc.Client: Retrying connect to server: localhost/127.0.0
.1:8888. Already tried 5 time(s).
11/08/18 14:56:49 INFO ipc.Client: Retrying connect to server: localhost/127.0.0
.1:8888. Already tried 6 time(s).
11/08/18 14:56:51 INFO ipc.Client: Retrying connect to server: localhost/127.0.0
.1:8888. Already tried 7 time(s).
11/08/18 14:56:53 INFO ipc.Client: Retrying connect to server: localhost/127.0.0
.1:8888. Already tried 8 time(s).
11/08/18 14:56:55 INFO ipc.Client: Retrying connect to server: localhost/127.0.0
.1:8888. Already tried 9 time(s).
Bad connection to FS. command aborted. exception: Call to localhost/127.0.0.1:88
88 failed on connection exception: java.net.ConnectException: Connection refused
: no further information
错误提示“Bad connection to FS. command aborted. exception: Call to localhost/127.0.0.1:88
88 failed on connection exception: java.net.ConnectException: Connection refused
: no further information”
起初怀疑是fs服务没有启动，但反复关闭启动多次后仍没用，请教高手后，被建议重新格式化namenode，就可以了。
格式化指令如下（在hadoop的bin目录下）：
$ ./hadoop namenode -format
成功 之后重启hadoop就可以了
2，如果显示的像一下错误信息：
$ bin/hadoop fs -ls /
11/08/18 17:02:35 INFO ipc.Client: Retrying connect to server: localhost/127.0.0
.1:9000. Already tried 0 time(s).
11/08/18 17:02:37 INFO ipc.Client: Retrying connect to server: localhost/127.0.0
.1:9000. Already tried 1 time(s).
11/08/18 17:02:39 INFO ipc.Client: Retrying connect to server: localhost/127.0.0
.1:9000. Already tried 2 time(s).
11/08/18 17:02:41 INFO ipc.Client: Retrying connect to server: localhost/127.0.0
.1:9000. Already tried 3 time(s).
11/08/18 17:02:43 INFO ipc.Client: Retrying connect to server: localhost/127.0.0
.1:9000. Already tried 4 time(s).
11/08/18 17:02:45 INFO ipc.Client: Retrying connect to server: localhost/127.0.0
.1:9000. Already tried 5 time(s).
11/08/18 17:02:46 INFO ipc.Client: Retrying connect to server: localhost/127.0.0
.1:9000. Already tried 6 time(s).
11/08/18 17:02:48 INFO ipc.Client: Retrying connect to server: localhost/127.0.0
.1:9000. Already tried 7 time(s).
11/08/18 17:02:50 INFO ipc.Client: Retrying connect to server: localhost/127.0.0
.1:9000. Already tried 8 time(s).
11/08/18 17:02:52 INFO ipc.Client: Retrying connect to server: localhost/127.0.0
.1:9000. Already tried 9 time(s).
Bad connection to FS. command aborted.
错误提示“Bad connection to FS. command aborted.”
把你DataNode上的DFS数据全删了，再重新格式化NameNode。
即：先将你D盘下tmp目录下所有文件删了，在重复上面第一点的过程
3,在cygwin上执行wordcount时报FileNotFoundException
原因： tmp路径有问题。配置文件mapred-site.xml中mapred.child.tmp默认是"./tmp"，在windows里会出问题
解决：将其改为D:/tmp（这个是windows下默认的，听说改成其他绝对路径也可以，会自动创建），之后重启hadoop即可
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