hadoop创建两大错误：Bad connection to FS. command aborted. exception和Shutting down NameNode at hadoop

1.问题目录表：

Error代码  

failed on connection exception: java.net.ConnectException: Connection refused

3.           : no further information

错误提示“Bad connection to FS. command aborted. exception: Call tolocalhost/127.0.0.1:88

88failed 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）：

Shell代码  

1.           $ ./hadoop namenode -format

成功之后重启hadoop就可以了

2如果错误还存在，那么手动删除文件

Error代码  

1.           $ bin/hadoop fs -ls /

// :: INFO ipc.Client: Retrying connect to server: localhost/

:. Already tried  time(s).

// :: INFO ipc.Client: Retrying connect to server: localhost/

:. Already tried  time(s).

// :: INFO ipc.Client: Retrying connect to server: localhost/

:. Already tried  time(s).

// :: INFO ipc.Client: Retrying connect to server: localhost/

:. Already tried  time(s).

// :: INFO ipc.Client: Retrying connect to server: localhost/

:. Already tried  time(s).

// :: INFO ipc.Client: Retrying connect to server: localhost/

:. Already tried  time(s).

// :: INFO ipc.Client: Retrying connect to server: localhost/

:. Already tried  time(s).

// :: INFO ipc.Client: Retrying connect to server: localhost/

:. Already tried  time(s).

// :: INFO ipc.Client: Retrying connect to server: localhost/

:. Already tried  time(s).

// :: INFO ipc.Client: Retrying connect to server: localhost/

:. Already tried  time(s).

Error代码  

1.           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

hadoop格式化失败原因

[root@hadoop home]# hadoop namenode -format

Warning: $HADOOP_HOME is deprecated.





14/01/24 11:41:59 INFO namenode.NameNode: STARTUP_MSG: 

/************************************************************

STARTUP_MSG: Starting NameNode

STARTUP_MSG:   host = hadoop/192.168.174.174

STARTUP_MSG:   args = [-format]

STARTUP_MSG:   version = 1.1.2

STARTUP_MSG:   build =https://svn.apache.org/repos/asf/hadoop/common/branches/branch-1.1 -r 1440782;compiled by 'hortonfo' on Thu Jan 31 02:03:24 UTC 2013

************************************************************/

Re-format filesystem in /usr/java/hadoop/tmp/dfs/name ? (Y or N) y

Format aborted in /usr/java/hadoop/tmp/dfs/name

14/01/24 11:42:04 INFO namenode.NameNode: SHUTDOWN_MSG: 

/************************************************************

SHUTDOWN_MSG: Shutting down NameNode at hadoop/192.168.174.174

************************************************************/

随后启动hadoop,发现http://hdp0:5007无法显示。

将cd/usr/java/hadoop/tmp/dfs文件夹整个删除。然后再格，成功！！！

[root@hadoop dfs]# hadoop namenode -format

Warning: $HADOOP_HOME is deprecated.





14/01/24 11:44:59 INFO namenode.NameNode: STARTUP_MSG: 

/************************************************************

STARTUP_MSG: Starting NameNode

STARTUP_MSG:   host = hadoop/192.168.174.174

STARTUP_MSG:   args = [-format]

STARTUP_MSG:   version = 1.1.2

STARTUP_MSG:   build = https://svn.apache.org/repos/asf/hadoop/common/branches/branch-1.1-r 1440782; compiled by 'hortonfo' on Thu Jan 31 02:03:24 UTC 2013

************************************************************/

14/01/24 11:44:59 INFO util.GSet: VM type       = 32-bit

14/01/24 11:44:59 INFO util.GSet: 2% max memory = 19.33375 MB

14/01/24 11:44:59 INFO util.GSet: capacity      = 2^22 = 4194304entries

14/01/24 11:44:59 INFO util.GSet: recommended=4194304, actual=4194304

14/01/24 11:45:00 INFO namenode.FSNamesystem: fsOwner=root

14/01/24 11:45:00 INFO namenode.FSNamesystem: supergroup=supergroup

14/01/24 11:45:00 INFO namenode.FSNamesystem: isPermissionEnabled=false

14/01/24 11:45:00 INFO namenode.FSNamesystem: dfs.block.invalidate.limit=100

14/01/24 11:45:00 INFO namenode.FSNamesystem: isAccessTokenEnabled=falseaccessKeyUpdateInterval=0 min(s), accessTokenLifetime=0 min(s)

14/01/24 11:45:00 INFO namenode.NameNode: Caching file names occuring more than10 times 

14/01/24 11:45:00 INFO common.Storage: Image file of size 110 saved in 0seconds.

14/01/24 11:45:00 INFO namenode.FSEditLog: closing edit log: position=4,editlog=/usr/java/hadoop/tmp/dfs/name/current/edits

14/01/24 11:45:00 INFO namenode.FSEditLog: close success: truncate to 4,editlog=/usr/java/hadoop/tmp/dfs/name/current/edits

14/01/24 11:45:01 INFO common.Storage: Storage directory/usr/java/hadoop/tmp/dfs/name has been successfully formatted.

14/01/24 11:45:01 INFO namenode.NameNode: SHUTDOWN_MSG: 

/************************************************************

SHUTDOWN_MSG: Shutting down NameNode at hadoop/192.168.174.174

************************************************************//************************************************************

STARTUP_MSG: Starting NameNode

STARTUP_MSG:   host = hdp0/192.168.221.100

STARTUP_MSG:   args = [-format]

STARTUP_MSG:   version = 0.20.2

STARTUP_MSG:   build = https://svn.apache.org/repos/asf/hadoop/common/branches/branch-0.20 -r911707; compiled
by 'chrisdo' on Fri Feb 19 08:07:34 UTC 2010

************************************************************/

11/04/12 15:33:30 INFO namenode.FSNamesystem:fsOwner=hadoop,hadoop,adm,dialout,cdrom,plugdev,lpadmin,admin,sambashare

11/04/12 15:33:30 INFO namenode.FSNamesystem: supergroup=supergroup

11/04/12 15:33:30 INFO namenode.FSNamesystem: isPermissionEnabled=true

11/04/12 15:33:31 INFO common.Storage: Image file of size 96 saved in 0seconds.

11/04/12 15:33:31 INFO common.Storage: Storage directory /home/hadoop/dfs/namehas been successfully formatted.

11/04/12 15:33:31 INFO namenode.NameNode: SHUTDOWN_MSG: 

/************************************************************

SHUTDOWN_MSG: Shutting down NameNode at hdp0/192.168.221.100

************************************************************/