diff --git a/src/observer/omt/ob_tenant.cpp b/src/observer/omt/ob_tenant.cpp
index fe98190574..e0d0677bbe 100644
--- a/src/observer/omt/ob_tenant.cpp
+++ b/src/observer/omt/ob_tenant.cpp
@@ -336,7 +336,7 @@ int ObResourceGroup::acquire_more_worker(int64_t num, int64_t &succ_num)
   while (OB_SUCC(ret) && need_num > succ_num) {
     ObThWorker *w = nullptr;
     if (OB_FAIL(create_worker(w, tenant_, group_id_, INT32_MAX, this))) {
-      LOG_ERROR("create worker failed", K(ret));
+      LOG_WARN("create worker failed", K(ret));
     } else if (!workers_.add_last(&w->worker_node_)) {
       OB_ASSERT(false);
       ret = OB_ERR_UNEXPECTED;
@@ -1381,7 +1381,7 @@ int ObTenant::acquire_level_worker(int64_t num, int64_t &succ_num, int32_t level
     while (OB_SUCC(ret) && need_num > succ_num) {
       ObThWorker *w = nullptr;
       if (OB_FAIL(create_worker(w, this, 0, level))) {
-        LOG_ERROR("create worker failed", K(ret));
+        LOG_WARN("create worker failed", K(ret));
       } else if (!nesting_workers_.add_last(&w->worker_node_)) {
         OB_ASSERT(false);
         ret = OB_ERR_UNEXPECTED;
@@ -1413,7 +1413,7 @@ int ObTenant::acquire_more_worker(int64_t num, int64_t &succ_num)
   while (OB_SUCC(ret) && num > succ_num) {
     ObThWorker *w = nullptr;
     if (OB_FAIL(create_worker(w, this, 0, 0))) {
-      LOG_ERROR("create worker failed", K(ret));
+      LOG_WARN("create worker failed", K(ret));
     } else if (!workers_.add_last(&w->worker_node_)) {
       OB_ASSERT(false);
       ret = OB_ERR_UNEXPECTED;
diff --git a/src/observer/omt/ob_th_worker.cpp b/src/observer/omt/ob_th_worker.cpp
index ed95f73d07..2645ec6ecf 100644
--- a/src/observer/omt/ob_th_worker.cpp
+++ b/src/observer/omt/ob_th_worker.cpp
@@ -50,8 +50,8 @@ int create_worker(ObThWorker* &worker, ObTenant *tenant, int32_t group_id,
 {
   int ret = OB_SUCCESS;
   if (tenant->total_worker_cnt() >= tenant->max_worker_cnt()) {
-    ret = OB_SIZE_OVERFLOW;
-    LOG_ERROR("create worker fail", K(ret), K(tenant->id()), K(group_id), K(level),
+    ret = OB_RESOURCE_OUT;
+    LOG_WARN("create worker fail", K(ret), K(tenant->id()), K(group_id), K(level),
                                     K(tenant->total_worker_cnt()), K(tenant->max_worker_cnt()));
   } else if (OB_ISNULL(worker = OB_NEW(ObThWorker,
                                        ObMemAttr(0 == GET_TENANT_ID() ? OB_SERVER_TENANT_ID : GET_TENANT_ID(),