diff --git a/src/observer/omt/ob_multi_level_queue.cpp b/src/observer/omt/ob_multi_level_queue.cpp
index 5892084a9a..bac2681e43 100644
--- a/src/observer/omt/ob_multi_level_queue.cpp
+++ b/src/observer/omt/ob_multi_level_queue.cpp
@@ -23,13 +23,11 @@ using namespace oceanbase::rpc;
 using namespace oceanbase::obrpc;
 
 
-int ObMultiLevelQueue::init(int64_t limit)
+void ObMultiLevelQueue::set_limit(int64_t limit)
 {
-  int ret = OB_SUCCESS;
   for (int32_t level = 0; level < MULTI_LEVEL_QUEUE_SIZE; level++) {
     queue_[level].set_limit(limit);
   }
-  return ret;
 }
 
 int ObMultiLevelQueue::push(ObRequest &req, const int32_t level, const int32_t prio)
diff --git a/src/observer/omt/ob_multi_level_queue.h b/src/observer/omt/ob_multi_level_queue.h
index 0a0f781eef..1dc2e1731a 100644
--- a/src/observer/omt/ob_multi_level_queue.h
+++ b/src/observer/omt/ob_multi_level_queue.h
@@ -26,7 +26,7 @@ namespace omt
 
 class ObMultiLevelQueue {
 public:
-  int init(const int64_t limit);
+  void set_limit(const int64_t limit);
   int push(rpc::ObRequest &req, const int32_t level, const int32_t prio);
   int pop(common::ObLink *&task, const int32_t level, const int64_t timeout_us);
   int pop_timeup(common::ObLink *&task, const int32_t level, const int64_t timeout_us);
diff --git a/src/observer/omt/ob_tenant.cpp b/src/observer/omt/ob_tenant.cpp
index 6c8f12a77b..1814f38a6d 100644
--- a/src/observer/omt/ob_tenant.cpp
+++ b/src/observer/omt/ob_tenant.cpp
@@ -317,6 +317,11 @@ int ObResourceGroup::init()
   return ret;
 }
 
+void ObResourceGroup::update_queue_size()
+{
+  req_queue_.set_limit(common::ObServerConfig::get_instance().tenant_task_queue_size);
+}
+
 int ObResourceGroup::acquire_more_worker(int64_t num, int64_t &succ_num)
 {
   int ret = OB_SUCCESS;
@@ -686,9 +691,7 @@ int ObTenant::init(const ObTenantMeta &meta)
   } else if (OB_ISNULL(multi_level_queue_ = OB_NEW(ObMultiLevelQueue, ObModIds::OMT_TENANT))) {
     ret = OB_ALLOCATE_MEMORY_FAILED;
     LOG_WARN("alloc ObMultiLevelQueue failed", K(ret), K(*this));
-  } else if (OB_FAIL(multi_level_queue_->init(
-          common::ObServerConfig::get_instance().tenant_task_queue_size))) {
-    LOG_WARN("ObMultiLevelQueue init failed", K(ret), K_(id), K(*this));
+  } else if (FALSE_IT(multi_level_queue_->set_limit(common::ObServerConfig::get_instance().tenant_task_queue_size))) {
   } else if (OB_ISNULL(rpc_stat_info_ = OB_NEW(RpcStatInfo, ObModIds::OMT_TENANT, id_))) {
     ret = OB_ALLOCATE_MEMORY_FAILED;
     LOG_WARN("alloc RpcStatInfo failed", K(ret), K(*this));
@@ -1367,6 +1370,7 @@ int ObTenant::timeup()
   calibrate_worker_count();
   handle_retry_req();
   calibrate_token_count();
+  update_queue_size();
   return ret;
 }
 
@@ -1384,6 +1388,20 @@ void ObTenant::handle_retry_req()
   }
 }
 
+void ObTenant::update_queue_size()
+{
+  ObResourceGroupNode* iter = NULL;
+  ObResourceGroup* group = nullptr;
+  while (NULL != (iter = group_map_.quick_next(iter))) {
+    group = static_cast<ObResourceGroup*>(iter);
+    group->update_queue_size();
+  }
+  req_queue_.set_limit(common::ObServerConfig::get_instance().tenant_task_queue_size);
+  if (nullptr != multi_level_queue_) {
+    multi_level_queue_->set_limit(common::ObServerConfig::get_instance().tenant_task_queue_size);
+  }
+}
+
 void ObTenant::calibrate_token_count()
 {
   if (dynamic_modify_token_ || OB_DATA_TENANT_ID == id_) {
diff --git a/src/observer/omt/ob_tenant.h b/src/observer/omt/ob_tenant.h
index 598072aad1..75e9b9be7f 100644
--- a/src/observer/omt/ob_tenant.h
+++ b/src/observer/omt/ob_tenant.h
@@ -308,6 +308,7 @@ public:
   share::ObCgroupCtrl *get_cgroup_ctrl() { return cgroup_ctrl_; }
 
   int init();
+  void update_queue_size();
   int acquire_more_worker(int64_t num, int64_t &succ_num);
   void calibrate_token_count();
   void check_worker_count();
@@ -487,6 +488,7 @@ public:
   int recv_large_request(rpc::ObRequest &req);
   int push_retry_queue(rpc::ObRequest &req, const uint64_t idx);
   void handle_retry_req();
+  void update_queue_size();
 
   void calibrate_token_count();
   void calibrate_group_token_count();
diff --git a/src/share/parameter/ob_parameter_seed.ipp b/src/share/parameter/ob_parameter_seed.ipp
index 26e6a4f01d..d196f24c1c 100644
--- a/src/share/parameter/ob_parameter_seed.ipp
+++ b/src/share/parameter/ob_parameter_seed.ipp
@@ -72,7 +72,7 @@ DEF_INT(high_priority_net_thread_count, OB_CLUSTER_PARAMETER, "0", "[0,64]",
 DEF_INT(rdma_io_thread_count, OB_CLUSTER_PARAMETER, "0", "[0,8]",
         "the number of RDMA I/O threads for Libreasy. Range: [0, 8] in integer, 0 stands for RDMA being disabled.",
         ObParameterAttr(Section::OBSERVER, Source::DEFAULT, EditLevel::STATIC_EFFECTIVE));
-DEF_INT(tenant_task_queue_size, OB_CLUSTER_PARAMETER, "65536", "[1024,]",
+DEF_INT(tenant_task_queue_size, OB_CLUSTER_PARAMETER, "8192", "[1024,]",
         "the size of the task queue for each tenant. Range: [1024,+∞)",
         ObParameterAttr(Section::OBSERVER, Source::DEFAULT, EditLevel::DYNAMIC_EFFECTIVE));
 _DEF_PARAMETER_SCOPE_CHECKER_EASY(private, Capacity, memory_limit, OB_CLUSTER_PARAMETER, "0",