YARN Application Master unable to connect to Resource Manager

Question

I have a 4 node cluster (1 Namenode/Resource Manager 3 datanodes/node managers)

I am trying to run a simple tez example orderedWordCount

hadoop jar          


        

Answer 1

It is because your resource manager is not reachable. Try to ping you resource manager from other nodes and see if it works. Maintain these configs consistent across cluster.