Format our HDFS -bash-4.2$ hadoop namenode -format 12/08/09 11:32:45 INFO namenode.NameNode: STARTUP_MSG: /************************************************************ STARTUP_MSG: Starting NameNode STARTUP_MSG: host = peter.test.net/192.168.2.200 STARTUP_MSG: args = [-format] STARTUP_MSG: version = 1.0.3 STARTUP_MSG: build = https://svn.apache.org/repos/asf/hadoop/common/branches/branch-1.0 -r 1335192; compiled by 'hortonfo' on Tue May 8 20:31:25 UTC 2012 ************************************************************/ 12/08/09 11:32:46 INFO util.GSet: VM type = 64-bit 12/08/09 11:32:46 INFO util.GSet: 2% max memory = 19.33375 MB 12/08/09 11:32:46 INFO util.GSet: capacity = 2^21 = 2097152 entries 12/08/09 11:32:46 INFO util.GSet: recommended=2097152, actual=2097152 12/08/09 11:32:47 INFO namenode.FSNamesystem: fsOwner=hduser 12/08/09 11:32:47 INFO namenode.FSNamesystem: supergroup=supergroup 12/08/09 11:32:47 INFO namenode.FSNamesystem: isPermissionEnabled=true 12/08/09 11:32:47 INFO namenode.FSNamesystem: dfs.block.invalidate.limit=100 12/08/09 11:32:47 INFO namenode.FSNamesystem: isAccessTokenEnabled=false accessKeyUpdateInterval=0 min(s), accessTokenLifetime=0 min(s) 12/08/09 11:32:47 INFO namenode.NameNode: Caching file names occuring more than 10 times 12/08/09 11:32:48 INFO common.Storage: Image file of size 112 saved in 0 seconds. 12/08/09 11:32:48 INFO common.Storage: Storage directory /hadoop/dfs/name has been successfully formatted. 12/08/09 11:32:48 INFO namenode.NameNode: SHUTDOWN_MSG: /************************************************************ SHUTDOWN_MSG: Shutting down NameNode at peter.test.net/192.168.2.200 ************************************************************/