diff --git a/packages/@azure/arm-datafactory/lib/models/datasetsMappers.ts b/packages/@azure/arm-datafactory/lib/models/datasetsMappers.ts
index d52dc2acd27e..386c4efed449 100644
--- a/packages/@azure/arm-datafactory/lib/models/datasetsMappers.ts
+++ b/packages/@azure/arm-datafactory/lib/models/datasetsMappers.ts
@@ -270,6 +270,7 @@ export {
   SetVariableActivity,
   FilterActivity,
   Expression,
+  ValidationActivity,
   UntilActivity,
   WaitActivity,
   ForEachActivity,
diff --git a/packages/@azure/arm-datafactory/lib/models/factoriesMappers.ts b/packages/@azure/arm-datafactory/lib/models/factoriesMappers.ts
index 9b5b2ebaa573..368e4205d3a3 100644
--- a/packages/@azure/arm-datafactory/lib/models/factoriesMappers.ts
+++ b/packages/@azure/arm-datafactory/lib/models/factoriesMappers.ts
@@ -276,6 +276,7 @@ export {
   SetVariableActivity,
   FilterActivity,
   Expression,
+  ValidationActivity,
   UntilActivity,
   WaitActivity,
   ForEachActivity,
diff --git a/packages/@azure/arm-datafactory/lib/models/index.ts b/packages/@azure/arm-datafactory/lib/models/index.ts
index 03c7c396fae4..950f643985ea 100644
--- a/packages/@azure/arm-datafactory/lib/models/index.ts
+++ b/packages/@azure/arm-datafactory/lib/models/index.ts
@@ -17291,7 +17291,7 @@ export interface CopyActivity {
 /**
  * Contains the possible cases for ControlActivity.
  */
-export type ControlActivityUnion = ControlActivity | AppendVariableActivity | SetVariableActivity | FilterActivity | UntilActivity | WaitActivity | ForEachActivity | IfConditionActivity | ExecutePipelineActivity;
+export type ControlActivityUnion = ControlActivity | AppendVariableActivity | SetVariableActivity | FilterActivity | ValidationActivity | UntilActivity | WaitActivity | ForEachActivity | IfConditionActivity | ExecutePipelineActivity;
 
 /**
  * @interface
@@ -17438,6 +17438,65 @@ export interface FilterActivity {
   condition: Expression;
 }
 
+/**
+ * @interface
+ * An interface representing ValidationActivity.
+ * This activity verifies that an external resource exists.
+ *
+ */
+export interface ValidationActivity {
+  /**
+   * @member {string} type Polymorphic Discriminator
+   */
+  type: "Validation";
+  /**
+   * @member {string} name Activity name.
+   */
+  name: string;
+  /**
+   * @member {string} [description] Activity description.
+   */
+  description?: string;
+  /**
+   * @member {ActivityDependency[]} [dependsOn] Activity depends on condition.
+   */
+  dependsOn?: ActivityDependency[];
+  /**
+   * @member {UserProperty[]} [userProperties] Activity user properties.
+   */
+  userProperties?: UserProperty[];
+  /**
+   * @member {any} [timeout] Specifies the timeout for the activity to run. If
+   * there is no value specified, it takes the value of TimeSpan.FromDays(7)
+   * which is 1 week as default. Type: string (or Expression with resultType
+   * string), pattern: ((\d+)\.)?(\d\d):(60|([0-5][0-9])):(60|([0-5][0-9])).
+   */
+  timeout?: any;
+  /**
+   * @member {any} [sleep] A delay in seconds between validation attempts. If
+   * no value is specified, 10 seconds will be used as the default. Type:
+   * integer (or Expression with resultType integer).
+   */
+  sleep?: any;
+  /**
+   * @member {any} [minimumSize] Can be used if dataset points to a file. The
+   * file must be greater than or equal in size to the value specified. Type:
+   * integer (or Expression with resultType integer).
+   */
+  minimumSize?: any;
+  /**
+   * @member {any} [childItems] Can be used if dataset points to a folder. If
+   * set to true, the folder must have at least one file. If set to false, the
+   * folder must be empty. Type: boolean (or Expression with resultType
+   * boolean).
+   */
+  childItems?: any;
+  /**
+   * @member {DatasetReference} dataset Validation activity dataset reference.
+   */
+  dataset: DatasetReference;
+}
+
 /**
  * @interface
  * An interface representing UntilActivity.
diff --git a/packages/@azure/arm-datafactory/lib/models/integrationRuntimesMappers.ts b/packages/@azure/arm-datafactory/lib/models/integrationRuntimesMappers.ts
index c6633723eedd..63de85bcc2c7 100644
--- a/packages/@azure/arm-datafactory/lib/models/integrationRuntimesMappers.ts
+++ b/packages/@azure/arm-datafactory/lib/models/integrationRuntimesMappers.ts
@@ -287,6 +287,7 @@ export {
   SetVariableActivity,
   FilterActivity,
   Expression,
+  ValidationActivity,
   UntilActivity,
   WaitActivity,
   ForEachActivity,
diff --git a/packages/@azure/arm-datafactory/lib/models/linkedServicesMappers.ts b/packages/@azure/arm-datafactory/lib/models/linkedServicesMappers.ts
index a51a050f48c6..0c22b083838e 100644
--- a/packages/@azure/arm-datafactory/lib/models/linkedServicesMappers.ts
+++ b/packages/@azure/arm-datafactory/lib/models/linkedServicesMappers.ts
@@ -270,6 +270,7 @@ export {
   SetVariableActivity,
   FilterActivity,
   Expression,
+  ValidationActivity,
   UntilActivity,
   WaitActivity,
   ForEachActivity,
diff --git a/packages/@azure/arm-datafactory/lib/models/mappers.ts b/packages/@azure/arm-datafactory/lib/models/mappers.ts
index b09c5ec7a5ae..47741b22d886 100644
--- a/packages/@azure/arm-datafactory/lib/models/mappers.ts
+++ b/packages/@azure/arm-datafactory/lib/models/mappers.ts
@@ -13835,6 +13835,53 @@ export const FilterActivity: msRest.CompositeMapper = {
   }
 };
 
+export const ValidationActivity: msRest.CompositeMapper = {
+  serializedName: "Validation",
+  type: {
+    name: "Composite",
+    polymorphicDiscriminator: Activity.type.polymorphicDiscriminator,
+    uberParent: "Activity",
+    className: "ValidationActivity",
+    modelProperties: {
+      ...ControlActivity.type.modelProperties,
+      timeout: {
+        serializedName: "typeProperties.timeout",
+        type: {
+          name: "Object"
+        }
+      },
+      sleep: {
+        serializedName: "typeProperties.sleep",
+        type: {
+          name: "Object"
+        }
+      },
+      minimumSize: {
+        serializedName: "typeProperties.minimumSize",
+        type: {
+          name: "Object"
+        }
+      },
+      childItems: {
+        serializedName: "typeProperties.childItems",
+        type: {
+          name: "Object"
+        }
+      },
+      dataset: {
+        required: true,
+        serializedName: "typeProperties.dataset",
+        defaultValue: {},
+        type: {
+          name: "Composite",
+          className: "DatasetReference"
+        }
+      }
+    },
+    additionalProperties: Activity.type.additionalProperties
+  }
+};
+
 export const UntilActivity: msRest.CompositeMapper = {
   serializedName: "Until",
   type: {
@@ -15765,6 +15812,7 @@ export const discriminators = {
   'Activity.AppendVariable' : AppendVariableActivity,
   'Activity.SetVariable' : SetVariableActivity,
   'Activity.Filter' : FilterActivity,
+  'Activity.Validation' : ValidationActivity,
   'Activity.Until' : UntilActivity,
   'Activity.Wait' : WaitActivity,
   'Activity.ForEach' : ForEachActivity,
diff --git a/packages/@azure/arm-datafactory/lib/models/pipelinesMappers.ts b/packages/@azure/arm-datafactory/lib/models/pipelinesMappers.ts
index 4de45d68008d..b04950177969 100644
--- a/packages/@azure/arm-datafactory/lib/models/pipelinesMappers.ts
+++ b/packages/@azure/arm-datafactory/lib/models/pipelinesMappers.ts
@@ -271,6 +271,7 @@ export {
   SetVariableActivity,
   FilterActivity,
   Expression,
+  ValidationActivity,
   UntilActivity,
   WaitActivity,
   ForEachActivity,
diff --git a/packages/@azure/arm-datafactory/lib/models/rerunTriggersMappers.ts b/packages/@azure/arm-datafactory/lib/models/rerunTriggersMappers.ts
index e6709295bb44..2e883d15a2c3 100644
--- a/packages/@azure/arm-datafactory/lib/models/rerunTriggersMappers.ts
+++ b/packages/@azure/arm-datafactory/lib/models/rerunTriggersMappers.ts
@@ -271,6 +271,7 @@ export {
   SetVariableActivity,
   FilterActivity,
   Expression,
+  ValidationActivity,
   UntilActivity,
   WaitActivity,
   ForEachActivity,
diff --git a/packages/@azure/arm-datafactory/lib/models/triggersMappers.ts b/packages/@azure/arm-datafactory/lib/models/triggersMappers.ts
index aadab2ed01ec..4be1758abbaa 100644
--- a/packages/@azure/arm-datafactory/lib/models/triggersMappers.ts
+++ b/packages/@azure/arm-datafactory/lib/models/triggersMappers.ts
@@ -270,6 +270,7 @@ export {
   SetVariableActivity,
   FilterActivity,
   Expression,
+  ValidationActivity,
   UntilActivity,
   WaitActivity,
   ForEachActivity,