root# bin/hadoop fs -mkdir t
mkdir: org.apache.hadoop.hdfs.server.namenode.SafeModeException: Cannot create directory /user/root/t. Name node is in safe mode.
not able to create anything in hdfs
I did
root# bin/hadoop fs -safemode leave
But showing
safemode: Unknown command
what is the problem?
Solution: http://unmeshasreeveni.blogspot.com/2014/04/name-node-is-in-safe-mode-how-to-leave.html?m=1
In order to forcefully let the namenode leave safemode, following command should be executed:
bin/hadoop dfsadmin -safemode leave
You are getting Unknown command
error for your command as -safemode
isn't a sub-command for hadoop fs
, but it is of hadoop dfsadmin
.
Also after the above command, I would suggest you to once run hadoop fsck
so that any inconsistencies crept in the hdfs might be sorted out.
Update:
Use hdfs
command instead of hadoop
command for newer distributions. The hadoop
command is being deprecated:
hdfs dfsadmin -safemode leave
hadoop dfsadmin
has been deprecated and so is hadoop fs
command, all hdfs related tasks are being moved to a separate command hdfs
.