Data Replication error in Hadoop

Question

I am implementing the Hadoop Single Node Cluster on my machine by following Michael Noll\'s tutorial and have come across data replication error:

Here\'s the full error

Answer 1

Look at your namenode (probably http://localhost:50070) and see how many datanodes it says you have.

If it is 0, then either your datanode isn't running or it isn't configured to connect to the namenode.

If it is 1, check to see how much free space it says there is in the DFS. It may be that the data node doesn't have anywhere it can write data to (data dir doesn't exist, or doesn't have write permissions).