org.apache.hadoop.hdfs.server.namenode.SafeModeException: Cannot create directory /user/...../test. Name node is in safe mode.
In order to forcefully let the namenode leave safemode, following command should be executed:
$ bin/hadoop dfsadmin -safemode leave
-safemode isn’t a sub-command for hadoop fs, but it is of hadoop dfsadmin.
Run following command so that any inconsistencies in the hdfs might be sorted out.
$ hadoop fsck
Reference:
http://hadoop.apache.org/docs/stable/hdfs_user_guide.html#Safemode
https://www.inkling.com/read/hadoop-definitive-guide-tom-white-3rd/chapter-10/hdfs
Big Data World 
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