@Felix Albani thanks for the answer. my datanode is up and running. and it works fine when i run any command from my cluster. However , problem occurred when i try to use eclipse from my local windows machine and connect it using spark. my cluster is in azure with 3 vms. below my understanding: 1. All the vm have public and internal ip. 2. namenode is successfully connected with public ip. 3. however datanode is not able to connect using public ip the reason when namenode provide list of ip to write data it provides internal ip address. below is exception : Excluding datanode DatanodeInfoWithStorage[10.0.0.8:50010,DS-fa8a8432-25c6-47af-9ffb-cd8aba0ccc77,DISK] the ip address 10.0.0.8 is the internal ip address of vm. ... View more