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

I encountered the same problem. When I looked at localhost:50070, under the cluster summary, all properties were shown as 0 except "DFS Used% 100". Usually, this situation occur because there are some mistakes in the three *-site.xml files under HADOOP_INSTALL/conf and hosts file.

In my case, the cause is unable to resolve the hostname. I solved the problem simply by adding "IP_Address hostname" to /etc/hosts.

Answer 2

In my case I had to delete:

/tmp/hadoop-<user-name> folder and format and start using sbin/start-dfs.sh

sbin/start-yarn.sh