I have a test cluster of two machines, on both of them hadoop is installed. I have configured the hadoop cluster but on admin UI (as in the below picture) I see that two nodes are running on the same master machine, and that the other machine has no Hadoop node.
On master machine following services are running:
~$ jps 26310 ResourceManager 27593 Jps 26216 DataNode 26135 NameNode 26557 NodeManager 26701 JobHistoryServer
On the slave machine:
~$ jps 2614 DataNode 2920 Jps 2707 NodeManager
I don't why the slave is not joining the cluster (It was before). I tried to shutdown all servers on both machines and format HDFS then restarting everything but that didnot help. Any help to figure whats causing that behavior is appreciated.