SafeModeException: Name node is in safe mode

classorg_1_1apache_1_1hadoop_1_1hdfs_1_1server_1_1namenode_1_1_safe_mode_exception

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

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