hadoop namenode -format格式化名称节点时出错

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[hadoop@Master ~]$hadoop namenode -format
14/02/04 23:49:36 INFO namenode.NameNode: STARTUP_MSG:
/************************************************************
STARTUP_MSG: Starting NameNode
STARTUP_MSG:   host = Master.Hadoop/192.168.1.105
STARTUP_MSG:   args = [-format]
STARTUP_MSG:   version = 0.20.2
STARTUP_MSG:   build = https://svn.apache.org/repos/asf/hadoop/common/branches/branch-0.20 -r 911707; compiled by 'chrisdo' on Fri Feb 19 08:07:34 UTC 2010
************************************************************/
Re-format filesystem in /usr/hadoop/tmp/dfs/name ? (Y or N) Y
14/02/04 23:49:45 INFO namenode.FSNamesystem: fsOwner=hadoop,hadoop
14/02/04 23:49:45 INFO namenode.FSNamesystem: supergroup=supergroup
14/02/04 23:49:45 INFO namenode.FSNamesystem: isPermissionEnabled=true
14/02/04 23:49:45 ERROR namenode.NameNode: java.io.IOException: Cannot remove current directory: /usr/hadoop/tmp/dfs/name/current
   at org.apache.hadoop.hdfs.server.common.Storage$StorageDirectory.clearDirectory(Storage.java:293)
   at org.apache.hadoop.hdfs.server.namenode.FSImage.format(FSImage.java:1086)
   at org.apache.hadoop.hdfs.server.namenode.FSImage.format(FSImage.java:1110)
   at org.apache.hadoop.hdfs.server.namenode.NameNode.format(NameNode.java:856)
   at org.apache.hadoop.hdfs.server.namenode.NameNode.createNameNode(NameNode.java:948)
   at org.apache.hadoop.hdfs.server.namenode.NameNode.main(NameNode.java:965)

14/02/04 23:49:45 INFO namenode.NameNode: SHUTDOWN_MSG:
/************************************************************
SHUTDOWN_MSG: Shutting down NameNode at Master.Hadoop/192.168.1.105
************************************************************/

解决办法：

把Master/Slave1/Slave2/Slave3,中/usr/hadoop/tem下的文件全删除。

注意：本人测试中的:tem是手动创建的。

如果不手动，那么系统每次启动时都会将该目录下的文件删除，并需要重新格式化。

然后：

[hadoop@Master ~]$hadoop namenode -format
14/02/04 23:54:44 INFO namenode.NameNode: STARTUP_MSG:
/************************************************************
STARTUP_MSG: Starting NameNode
STARTUP_MSG:   host = Master.Hadoop/192.168.1.105
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 -r 911707; compiled by 'chrisdo' on Fri Feb 19 08:07:34 UTC 2010
************************************************************/
14/02/04 23:54:44 INFO namenode.FSNamesystem: fsOwner=hadoop,hadoop
14/02/04 23:54:44 INFO namenode.FSNamesystem: supergroup=supergroup
14/02/04 23:54:44 INFO namenode.FSNamesystem: isPermissionEnabled=true
14/02/04 23:54:45 INFO common.Storage: Image file of size 96 saved in 0 seconds.
14/02/04 23:54:45 INFO common.Storage: Storage directory /usr/hadoop/tmp/dfs/name has been successfully formatted.
14/02/04 23:54:45 INFO namenode.NameNode: SHUTDOWN_MSG:
/************************************************************
SHUTDOWN_MSG: Shutting down NameNode at Master.Hadoop/192.168.1.105
************************************************************/

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