diff --git a/deps/oblib/src/lib/allocator/ob_cached_allocator.h b/deps/oblib/src/lib/allocator/ob_cached_allocator.h
index de722b79ca..c5d8d9cfaf 100644
--- a/deps/oblib/src/lib/allocator/ob_cached_allocator.h
+++ b/deps/oblib/src/lib/allocator/ob_cached_allocator.h
@@ -29,7 +29,7 @@ public:
   virtual ~ObCachedAllocator();
 
   T *alloc();
-  void free(T *obj);
+  void free(T *obj, bool can_reuse = true);
   int32_t get_allocated_count() const {return allocated_count_;};
   int32_t get_cached_count() const {return cached_count_;};
 private:
@@ -88,12 +88,16 @@ T *ObCachedAllocator<T>::alloc()
 }
 
 template<typename T>
-void ObCachedAllocator<T>::free(T *obj)
+void ObCachedAllocator<T>::free(T *obj, bool can_reuse)
 {
   if (OB_LIKELY(NULL != obj)) {
     int ret = OB_SUCCESS;
     ObSpinLockGuard guard(lock_);
-    if (OB_FAIL(cached_objs_.push_back(obj))) {
+    if (!can_reuse) {
+      // free directly
+      obj->~T();
+      pool_.free(obj);
+    } else if (OB_FAIL(cached_objs_.push_back(obj))) {
       LIB_LOG(ERROR, "failed to push obj into array", K(ret));
       // free directly
       obj->~T();
diff --git a/deps/oblib/src/lib/mysqlclient/ob_mysql_proxy.cpp b/deps/oblib/src/lib/mysqlclient/ob_mysql_proxy.cpp
index 58e4adb3f9..517080c1ec 100644
--- a/deps/oblib/src/lib/mysqlclient/ob_mysql_proxy.cpp
+++ b/deps/oblib/src/lib/mysqlclient/ob_mysql_proxy.cpp
@@ -446,7 +446,7 @@ int ObDbLinkProxy::create_dblink_pool(uint64_t tenant_id, uint64_t dblink_id, Db
   return ret;
 }
 
-int ObDbLinkProxy::acquire_dblink(uint64 tenant_id, uint64_t dblink_id,
+int ObDbLinkProxy::acquire_dblink(uint64_t tenant_id, uint64_t dblink_id,
                                   DblinkDriverProto dblink_type,
                                   const dblink_param_ctx &param_ctx,
                                   ObISQLConnection *&dblink_conn,
diff --git a/deps/oblib/src/lib/mysqlclient/ob_mysql_proxy.h b/deps/oblib/src/lib/mysqlclient/ob_mysql_proxy.h
index 8870902e95..ac29cdcb0e 100644
--- a/deps/oblib/src/lib/mysqlclient/ob_mysql_proxy.h
+++ b/deps/oblib/src/lib/mysqlclient/ob_mysql_proxy.h
@@ -172,7 +172,7 @@ public:
                          const common::ObString &conn_str,
                          const common::ObString &cluster_str,
                          const sqlclient::dblink_param_ctx &param_ctx);
-  int acquire_dblink(uint64 tenant_id, uint64_t dblink_id,
+  int acquire_dblink(uint64_t tenant_id, uint64_t dblink_id,
                      sqlclient::DblinkDriverProto dblink_type,
                      const sqlclient::dblink_param_ctx &param_ctx,
                      sqlclient::ObISQLConnection *&dblink_conn,