diff --git a/sahara/tests/scenario/README.rst b/sahara/tests/scenario/README.rst
index 6b53a5f9..451a869a 100644
--- a/sahara/tests/scenario/README.rst
+++ b/sahara/tests/scenario/README.rst
@@ -275,19 +275,19 @@ Section "cluster_template"
 
 This section is dictionary-type.
 
-+----------------------+---------+----------+-----------+---------------------------------------+
-|        Fields        |  Type   | Required |  Default  |                 Value                 |
-+======================+=========+==========+===========+=======================================+
-| name                 | string  | True     |           | name for cluster template             |
-+----------------------+---------+----------+-----------+---------------------------------------+
-| description          | string  |          | Empty     | description                           |
-+----------------------+---------+----------+-----------+---------------------------------------+
-| cluster_configs      | object  |          |           | name_of_config_section: config: value |
-+----------------------+---------+----------+-----------+---------------------------------------+
-| node_group_templates | object  | True     |           | name_of_node_group: count             |
-+----------------------+---------+----------+-----------+---------------------------------------+
-| anti_affinity        | boolean |          | False     |                                       |
-+----------------------+---------+----------+-----------+---------------------------------------+
++----------------------+--------+----------+-----------+---------------------------------------+
+|        Fields        |  Type  | Required |  Default  |                 Value                 |
++======================+========+==========+===========+=======================================+
+| name                 | string | True     |           | name for cluster template             |
++----------------------+--------+----------+-----------+---------------------------------------+
+| description          | string |          | Empty     | description                           |
++----------------------+--------+----------+-----------+---------------------------------------+
+| cluster_configs      | object |          |           | name_of_config_section: config: value |
++----------------------+--------+----------+-----------+---------------------------------------+
+| node_group_templates | object | True     |           | name_of_node_group: count             |
++----------------------+--------+----------+-----------+---------------------------------------+
+| anti_affinity        | array  |          | Empty     | array of roles                        |
++----------------------+--------+----------+-----------+---------------------------------------+
 
 
 Section "cluster"
diff --git a/sahara/tests/scenario/validation.py b/sahara/tests/scenario/validation.py
index 0021a2ed..56364992 100644
--- a/sahara/tests/scenario/validation.py
+++ b/sahara/tests/scenario/validation.py
@@ -231,7 +231,11 @@ SCHEMA = {
                                 }
                             },
                             "anti_affinity": {
-                                "type": "boolean"
+                                "type": "array",
+                                "items": {
+                                    "type": "string",
+                                    "minLength": 1
+                                }
                             }
                         },
                         "required": ["name", "node_group_templates"],
diff --git a/sahara/tests/scenario_unit/vanilla2_7_1.yaml b/sahara/tests/scenario_unit/vanilla2_7_1.yaml
index 95d10cac..72a59bc6 100644
--- a/sahara/tests/scenario_unit/vanilla2_7_1.yaml
+++ b/sahara/tests/scenario_unit/vanilla2_7_1.yaml
@@ -41,6 +41,9 @@ clusters:
           node_group_templates:
               master: 1
               worker: 3
+          anti_affinity:
+            - namenode
+            - datanode
       scenario:
           - run_jobs
           - scale