Typical Error
ERROR namenode.NameNode: java.io.IOException: Cannot create directory /app/hadoop/tmp/dfs/name/current
at org.apache.hadoop.hdfs.server.common.Storage$StorageDirectory.clearDirectory(Storage.java:297)
at org.apache.hadoop.hdfs.server.namenode.FSImage.format(FSImage.java:1219)
at org.apache.hadoop.hdfs.server.namenode.FSImage.format(FSImage.java:1238)
at org.apache.hadoop.hdfs.server.namenode.NameNode.format(NameNode.java:1038)
at org.apache.hadoop.hdfs.server.namenode.NameNode.createNameNode(NameNode.java:1145)
at org.apache.hadoop.hdfs.server.namenode.NameNode.main(NameNode.java:1162)How to solve it :
sudo chown 755 /app/hadoop/tmp
Now we create the directory and set the required ownerships and permissions:
$ sudo mkdir -p /app/hadoop/tmp $ sudo chown hduser:hadoop /app/hadoop/tmp # ...and if you want to tighten up security, chmod from 755 to 750... $ sudo chmod 750 /app/hadoop/tmp
If you forget to set the required ownerships and permissions, you will see a java.io.IOException when you try to format the name node in the next section).
Success Case:
*******************************************/
INFO util.GSet: VM type = 64-bit
INFO util.GSet: 2% max memory = 17.77875 MB
INFO util.GSet: capacity = 2^21 = 2097152 entries
INFO util.GSet: recommended=2097152, actual=2097152
INFO namenode.FSNamesystem: fsOwner=hduser
INFO namenode.FSNamesystem: supergroup=supergroup
INFO namenode.FSNamesystem: isPermissionEnabled=true
INFO namenode.FSNamesystem: dfs.block.invalidate.limit=100
INFO namenode.FSNamesystem: isAccessTokenEnabled=false accessKeyUpdateInterval=0 min(s), accessTokenLifetime=0 min(s)
INFO namenode.NameNode: Caching file names occuring more than 10 times
INFO common.Storage: Image file of size 112 saved in 0 seconds.
INFO common.Storage: Storage directory /app/hadoop/tmp/dfs/name has been successfully formatted.
INFO namenode.NameNode: SHUTDOWN_MSG:
refer:
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