Hadoop Installation(Single-Node)-3/3

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Hadoop 1.0.4 on Ubuntu Linux 12.04 ( Single Node )- Part -3/3


Before starting the hadoop, you need to format the HDFS (i.e the hadoop filesystem) via the namenode.

What this does is basically clears the directory values given in {dfs.name.dir}.This is the directory used by name-node to keep details of all the data in the data-node( i.e files), basically every detail required to track the which data sits in which data-node.

Please understand that it does not store any data itself, it just stored the details of which data sits on which data-nodes.

use the below command to format the name-node. 
./hadoop-1.0.4/bin/hadoop namenode -format
and the result looks like below.

Now you can start your hadoop. 
./hadoop-1.0.4/bin/start-all.sh
and there result looks like this. Also check if all the required hadoop processes are running by typing jps.

 
If you face any problems then have a look into the logs file and investigate.
and If you want to stop hadoop use teh below command 
./hadoop-1.0.4/bin/stop-all.sh
To access the hadoop local pages. use the below default urls and make sure it works.

  • NameNode = http://localhost:50070/dfshealth.jsp 
  • JobTracker = http://localhost:50030/jobtracker.jsp

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