There are 0 datanode(s) running and no node(s) are excluded in this operation

Question

I have set up a multi node Hadoop Cluster. The NameNode and Secondary namenode runs on the same machine and the cluster has only one Datanode. All the nodes are configured o

Answer 1

I had obtained the same error, in my case it was due to a bad configuration of the hosts files, first I have modified the hosts file of the master node adding the IPs of the slaves and also in each DataNode, I have modified the Hosts files to indicate the IPs of the NameNode and the rest of slaves.

Same think like this

adilazh1@master:~$ sudo cat /etc/hosts
[sudo] contraseña para adilazh1:
127.0.0.1       localhost
192.168.56.100  master

# The following lines are desirable for IPv6 capable hosts
::1     localhost ip6-localhost ip6-loopback
ff02::1 ip6-allnodes
ff02::2 ip6-allrouters
192.168.56.101  slave1
192.168.56.102  slave2

Example slave1's hosts file

127.0.0.1       localhost
192.168.56.101  slave1

# The following lines are desirable for IPv6 capable hosts
::1     localhost ip6-localhost ip6-loopback
ff02::1 ip6-allnodes
ff02::2 ip6-allrouters
192.168.56.100  master
192.168.56.102  slave2