Hadoop

Installed hadoop successfully.

Source: 
http://www.michael-noll.com/tutorials/running-hadoop-on-ubuntu-linux-single-node-cluster/

http://codesfusion.blogspot.in/2013/10/setup-hadoop-2x-220-on-ubuntu.html

Error while using commands put or copyFromLocal :

14/09/08 23:33:44 WARN hdfs.DFSClient: DataStreamer Exception
org.apache.hadoop.ipc.RemoteException(java.io.IOException): File /user/hduser/test/tmp.txt._COPYING_ could only be replicated to 0 nodes instead of minReplication (=1).  There are 1 datanode(s) running and no node(s) are excluded in this operation
.....
File /user/hduser/test/tmp.txt._COPYING_ could only be replicated to 0 nodes instead of minReplication (=1).  There are 1 datanode(s) running and no node(s) are excluded in this operation.

14/09/08 23:33:44 INFO namenode.FSEditLog: Number of transactions: 7 Total time for transactions(ms): 27 Number of transactions batched in Syncs: 0 Number of syncs: 5 SyncTimes(ms): 949
14/09/08 23:33:44 WARN blockmanagement.BlockPlacementPolicy: Failed to place enough replicas, still in need of 1 to reach 1. For more information, please enable DEBUG log level on org.apache.hadoop.hdfs.server.blockmanagement.BlockPlacementPolicy
14/09/08 23:33:44 INFO ipc.Server: IPC Server handler 5 on 9000, call org.apache.hadoop.hdfs.protocol.ClientProtocol.addBlock from 127.0.0.1:49146 Call#5 Retry#0
java.io.IOException: File /user/hduser/test/tmp.txt._COPYING_ could only be replicated to 0 nodes instead of minReplication (=1).  There are 1 datanode(s) running and no node(s) are excluded in this operation.