Issue while adding nodes to the cluster. Newly Added Datanodes went down

[#1]

PROBLEM STATEMENT: We have recently added 40 Datnodes added to cluster and they went down immediately after adding. Below was the exception found -

ERROR:

ROOT CAUSE:

Customer added the 40nodes to the cluster running rack topology script as per link given -

https://docs.hortonworks.com/HDPDocuments/HDP2/HDP-2.3.0/bk_hdfs_admin_tools/content/ch05.html

The topology script which was copied by customer from above link was missing "fi" on last line and hence was giving above exception.

RESOLUTION: Populated corrected script rack-topology.sh on namenode and datanodes and tried starting the datanodes after which datanode service was able to startup.