我是Hadoop的新手，我遇到了一些问题，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..
我真的不确定我在做什么wronge，或者属性文件中有什么要改变的吗？
HDFS默认目录存储是/ user //，我应该更改此默认目录以便解决我的问题吗？
每次我必须格式化namenode以解决此问题，但在格式化后，上面创建的目录将丢失。
请告诉我这背后的问题是什么.. 非常感谢您的帮助。
谢谢， 作者Abhijit
答案 0 :(得分：2)
由于多种原因发生此错误，我一直在玩hadoop。多次出现此问题且原因不同