diff --git a/src/storage/tx/ob_tx_log.h b/src/storage/tx/ob_tx_log.h
index 7e096e0659..ffaab4a333 100755
--- a/src/storage/tx/ob_tx_log.h
+++ b/src/storage/tx/ob_tx_log.h
@@ -993,7 +993,13 @@ public:
       }
     // it will be enabled after clog support big clog
     // } else if (NORMAL_LOG_BUF_SIZE == len_) {
-    //   if (OB_ISNULL(ptr = alloc_big_buf_())) {
+    //   int64_t data_version = 0;
+    //   if (OB_FAIL(GET_MIN_DATA_VERSION(MTL_ID(), data_version))) {
+    //     TRANS_LOG(WARN, "get data version failed", K(ret));
+    //   } else if (data_version < DATA_VERSION_4_2_2_0) {
+    //     ret = OB_NOT_SUPPORTED;
+    //     TRANS_LOG(WARN, "big log is not supported", K(ret));
+    //   } else if (OB_ISNULL(ptr = alloc_big_buf_())) {
     //     ret = OB_ALLOCATE_MEMORY_FAILED;
     //   } else {
     //     if (pos > 0) {