updated tags and updated roles

tasks/cassandra.yml

diff --git a/tasks/cassandra.yml b/tasks/cassandra.yml
index 4ffcce7..3e31658 100644
--- a/tasks/cassandra.yml
+++ b/tasks/cassandra.yml
@@ -14,6 +14,11 @@
     msg: 'ds group is not defined in the inventory file, please define the ds group in the inventory file'
   when: groups['ds'] is not defined
 
+- name: Fail if dc-1-ds group is not provided
+  fail:
+    msg: 'dc-1-ds group is not defined in the inventory file, please define the dc-1-ds group in the inventory file'
+  when: groups['dc-1-ds'] is not defined
+
 #- name: Capture hostvars
 #  set_fact:
 #    hostvars_json: '{{ hostvars }}'