我是hadoop新手，我有几个问题，但我无法找到任何解决方案我的问题如下：

**Created a directory on HDFS using below command:

 --bin/hadoop fs -mkdir /user/abhijit/apple_poc

**Checking if my directory has been created:

 --bin/hadoop fs -ls
 --(output)-->drwxr-xr-x   - abhijit supergroup          0 2013-07-11 11:09 /user/abhijit/apple_poc

**Stopping all hadoop daemons:

 --bin/stop-all.sh 

**Restarting all the daemons again:

 --bin/start-all.sh 

**Again checking if my directory on HDFS created above is present or not:

 --bin/hadoop fs -ls
 --(output):
 2013-07-11 11:37:57.304 java[3457:1903] Unable to load realm info from SCDynamicStore
 13/07/11 11:37:58 INFO ipc.Client: Retrying connect to server:localhost/127.0.0.1:9000. Already tried 0 time(s); retry policy is RetryUpToMaximumCountWithFixedSleep(maxRetries=10, sleepTime=1 SECONDS)
 13/07/11 11:37:59 INFO ipc.Client: Retrying connect to server: localhost/127.0.0.1:9000. Already tried 1 time(s); retry policy is RetryUpToMaximumCountWithFixedSleep(maxRetries=10, sleepTime=1 SECONDS)
 13/07/11 11:38:00 INFO ipc.Client: Retrying connect to server: localhost/127.0.0.1:9000. Already tried 2 time(s); retry policy is RetryUpToMaximumCountWithFixedSleep(maxRetries=10, sleepTime=1 SECONDS)
 13/07/11 11:38:01 INFO ipc.Client: Retrying connect to server: localhost/127.0.0.1:9000. Already tried 3 time(s); retry policy is RetryUpToMaximumCountWithFixedSleep(maxRetries=10, sleepTime=1 SECONDS)
 13/07/11 11:38:02 INFO ipc.Client: Retrying connect to server: localhost/127.0.0.1:9000. Already tried 4 time(s); retry policy is RetryUpToMaximumCountWithFixedSleep(maxRetries=10, sleepTime=1 SECONDS)
 13/07/11 11:38:03 INFO ipc.Client: Retrying connect to server: localhost/127.0.0.1:9000. Already tried 5 time(s); retry policy is RetryUpToMaximumCountWithFixedSleep(maxRetries=10, sleepTime=1 SECONDS)
 13/07/11 11:38:04 INFO ipc.Client: Retrying connect to server: localhost/127.0.0.1:9000. Already tried 6 time(s); retry policy is RetryUpToMaximumCountWithFixedSleep(maxRetries=10, sleepTime=1 SECONDS)
 13/07/11 11:38:05 INFO ipc.Client: Retrying connect to server: localhost/127.0.0.1:9000. Already tried 7 time(s); retry policy is RetryUpToMaximumCountWithFixedSleep(maxRetries=10, sleepTime=1 SECONDS)
 13/07/11 11:38:06 INFO ipc.Client: Retrying connect to server: localhost/127.0.0.1:9000. Already tried 8 time(s); retry policy is RetryUpToMaximumCountWithFixedSleep(maxRetries=10, sleepTime=1 SECONDS)
 13/07/11 11:38:07 INFO ipc.Client: Retrying connect to server: localhost/127.0.0.1:9000. Already tried 9 time(s); retry policy is RetryUpToMaximumCountWithFixedSleep(maxRetries=10, sleepTime=1 SECONDS)
 Bad connection to FS. command aborted. exception: Call to localhost/127.0.0.1:9000 failed on connection exception: java.net.ConnectException: Connection refused

请澄清。。
我真的不知道我做错了什么，或是有什么东西要改变的财产档案？
hdfs的默认目录存储是/user//，我是否应该更改此默认目录以解决问题？
每次我都要格式化namenode来解决这个问题，但是在格式化之后，我上面创建的目录就丢失了。
请让我知道这背后的问题是什么。。非常感谢你的帮助。
谢谢，阿比Git