Mrhs121 commented on code in PR #17799:
URL: 
https://github.com/apache/dolphinscheduler/pull/17799#discussion_r2625406826


##########
dolphinscheduler-api/src/main/java/org/apache/dolphinscheduler/api/service/impl/ProjectWorkerGroupRelationServiceImpl.java:
##########
@@ -94,7 +94,25 @@ public Result assignWorkerGroupsToProject(User loginUser, 
Long projectCode, List
             return result;
         }
 
+        Project project = projectMapper.queryByCode(projectCode);
+        if (Objects.isNull(project)) {
+            putMsg(result, Status.PROJECT_NOT_EXIST);
+            return result;
+        }
+
         if (CollectionUtils.isEmpty(workerGroups)) {
+            Set<String> projectWorkerGroupNames =
+                    
projectWorkerGroupDao.queryAssignedWorkerGroupNamesByProjectCode(projectCode);
+            if (CollectionUtils.isNotEmpty(projectWorkerGroupNames)) {
+                Set<String> usedWorkerGroups = getAllUsedWorkerGroups(project);
+                if (CollectionUtils.isNotEmpty(usedWorkerGroups)) {
+                    Set<String> usedInProject = 
SetUtils.intersection(usedWorkerGroups, projectWorkerGroupNames);
+                    if (!usedInProject.isEmpty()) {
+                        throw new 
ServiceException(Status.USED_WORKER_GROUP_EXISTS, usedInProject);
+                    }
+                }

Review Comment:
   I have added the row lock. please help review it when you have time, thank 
you.



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