diff --git a/core/api/src/main/java/org/onosproject/net/group/GroupService.java b/core/api/src/main/java/org/onosproject/net/group/GroupService.java
index 47e0882..ef62783 100644
--- a/core/api/src/main/java/org/onosproject/net/group/GroupService.java
+++ b/core/api/src/main/java/org/onosproject/net/group/GroupService.java
@@ -107,6 +107,26 @@
                                 ApplicationId appId);
 
     /**
+     * Set buckets for an existing group. The caller can optionally
+     * associate a new cookie during this updation. GROUP_UPDATED or
+     * GROUP_UPDATE_FAILED notifications would be provided along with
+     * cookie depending on the result of the operation on the device.
+     *
+     * This operation overwrites the previous group buckets entirely.
+     *
+     * @param deviceId  device identifier
+     * @param oldCookie cookie to be used to retrieve the existing group
+     * @param buckets   immutable list of group buckets to be set
+     * @param newCookie immutable cookie to be used post update operation
+     * @param appId     Application Id
+     */
+    default void setBucketsForGroup(DeviceId deviceId,
+                                    GroupKey oldCookie,
+                                    GroupBuckets buckets,
+                                    GroupKey newCookie,
+                                    ApplicationId appId) {}
+
+    /**
      * Purges all the group entries on the specified device.
      * @param deviceId device identifier
      */