diff --git a/src/sql/dtl/ob_dtl_local_channel.cpp b/src/sql/dtl/ob_dtl_local_channel.cpp
index f75099d390144c015271361c1418e4fa5c290ed4..c2b80d9040f43b74c6eacefaa3ea5b575adbb2e6 100644
--- a/src/sql/dtl/ob_dtl_local_channel.cpp
+++ b/src/sql/dtl/ob_dtl_local_channel.cpp
@@ -96,7 +96,6 @@ int ObDtlLocalChannel::send_shared_message(ObDtlLinkedBuffer*& buf)
             KP(buf));
         bool is_eof = buf->is_eof();
         if (OB_FAIL(DTL.get_dfc_server().cache(/*buf->tenant_id(), */ peer_id_, buf, true))) {
-          ret = tmp_ret;
           LOG_WARN("get DTL channel fail", KP(peer_id_), "peer", get_peer(), K(ret), K(tmp_ret));
         } else {
           // return block after cache first msg
diff --git a/src/sql/dtl/ob_dtl_local_first_buffer_manager.cpp b/src/sql/dtl/ob_dtl_local_first_buffer_manager.cpp
index e22b72520b1cc67f039170c0918e393cb05f20f8..b8699771a437b55bfb7c5ae014ac769b596ee907 100644
--- a/src/sql/dtl/ob_dtl_local_first_buffer_manager.cpp
+++ b/src/sql/dtl/ob_dtl_local_first_buffer_manager.cpp
@@ -38,7 +38,9 @@ int ObDtlLocalFirstBufferCache::ObDtlBufferClean::operator()(sql::dtl::ObDtlCach
   int ret = OB_SUCCESS;
   ObDtlLinkedBuffer* linked_buffer = buffer_info->buffer();
   buffer_info->set_buffer(nullptr);
-  tenant_mem_mgr_->free(linked_buffer);
+  if (nullptr != linked_buffer) {
+    tenant_mem_mgr_->free(linked_buffer);
+  }
   buffer_info->reset();
   buffer_info_mgr_->free_buffer_info(buffer_info);
   return ret;
@@ -113,23 +115,27 @@ int ObDtlLocalFirstBufferCache::cache_buffer(ObDtlCacheBufferInfo*& buffer)
   int ret = OB_SUCCESS;
   if (OB_NOT_NULL(buffer)) {
     uint64_t chan_id = buffer->chid();
-    if (OB_FAIL(buffer_map_.set_refactored(chan_id, buffer))) {
+#ifdef ERRSIM
+    // -17 enable failed set refactored
+    ret = E(EventTable::EN_DTL_ONE_ROW_ONE_BUFFER) ret;
+#endif
+    int64_t tmp_ret = ret;
+    if (TP_ENABLE_FAILED_SET_HT == ret) {
+      ret = OB_ERR_UNEXPECTED;
+      LOG_WARN("failed to set refactor", K(ret), K(tmp_ret));
+    } else if (OB_FAIL(buffer_map_.set_refactored(chan_id, buffer))) {
       LOG_WARN("failed to insert buffer map", K(ret));
-    } else if (OB_FAIL(set_first_buffer(chan_id))) {
-      int tmp_ret = OB_SUCCESS;
-      ObDtlCacheBufferInfo* tmp_buffer = nullptr;
-      if (tmp_ret != buffer_map_.erase_refactored(chan_id, tmp_buffer)) {
-        LOG_WARN("failed to insert buffer map", K(ret), K(tmp_ret));
-      } else if (nullptr == tmp_buffer) {
+    } else {
+      buffer = nullptr;
+      if (TP_ENABLE_FAILED_SET_FIRST_BUFFER == tmp_ret) {
         ret = OB_ERR_UNEXPECTED;
-        LOG_WARN("buffer is null", K(ret), K(tmp_ret));
+        LOG_WARN("failed to set first buffer", K(ret), K(tmp_ret));
+      } else if (OB_FAIL(set_first_buffer(chan_id))) {
+        LOG_WARN("failed to set first buffer", K(ret), K(chan_id), KP(chan_id));
       } else {
-        buffer = tmp_buffer;
+        inc_first_buffer_cnt();
+        LOG_DEBUG("trace cache buffer", KP(chan_id), KP(this), K(dfo_key_));
       }
-      LOG_WARN("failed to set first buffer", K(ret), K(chan_id), KP(chan_id));
-    } else {
-      inc_first_buffer_cnt();
-      LOG_DEBUG("trace cache buffer", KP(chan_id), KP(this), K(dfo_key_));
     }
   }
   return ret;
@@ -421,7 +427,18 @@ int ObDtlLocalFirstBufferCacheManager::cache_buffer(int64_t chid, ObDtlLinkedBuf
         buf_info->set_buffer(data_buffer);
         data_buffer = nullptr;
       } else {
-        ObDtlLinkedBuffer* buffer = tenant_mem_mgr_->alloc(chid, data_buffer->size());
+        ObDtlLinkedBuffer *buffer = nullptr;
+#ifdef ERRSIM
+        // -16 enable failed to alloc memory
+        ret = E(EventTable::EN_DTL_ONE_ROW_ONE_BUFFER) ret;
+#endif
+        if (OB_SUCC(ret) || TP_ENABLE_FAILED_ALLOC_MEM != ret) {
+          ret = OB_SUCCESS;
+          buffer = tenant_mem_mgr_->alloc(chid, data_buffer->size());
+        } else {
+          ret = OB_SUCCESS;
+          buffer = nullptr;
+        }
         if (nullptr != buffer) {
           ObDtlLinkedBuffer::assign(*data_buffer, buffer);
           buf_info->set_buffer(buffer);
@@ -442,13 +459,10 @@ int ObDtlLocalFirstBufferCacheManager::cache_buffer(int64_t chid, ObDtlLinkedBuf
     if (OB_FAIL(ret)) {
       int tmp_ret = OB_SUCCESS;
       if (nullptr != buf_info) {
-        if (nullptr == data_buffer) {
-          // if cache buffer failed, should still send it. Can't just free it
-          data_buffer = buf_info->buffer();
-          buf_info->set_buffer(nullptr);
-        }
-        if (!attach && OB_NOT_NULL(data_buffer)) {
-          tenant_mem_mgr_->free(data_buffer);
+        ObDtlLinkedBuffer *buffer = buf_info->buffer();
+        buf_info->set_buffer(nullptr);
+        if (nullptr != buffer) {
+          tenant_mem_mgr_->free(buffer);
         }
         if (OB_SUCCESS != (tmp_ret = buffer_info_mgr_.free_buffer_info(buf_info))) {
           LOG_WARN("failed to free buffer info", K(ret), K(tmp_ret));
diff --git a/src/sql/dtl/ob_dtl_local_first_buffer_manager.h b/src/sql/dtl/ob_dtl_local_first_buffer_manager.h
index 27b8505a3b8a6cb56536a604d8c90d999a9399f7..7472a1f9a6888c50680e4aabc1e92fe5f7956144 100644
--- a/src/sql/dtl/ob_dtl_local_first_buffer_manager.h
+++ b/src/sql/dtl/ob_dtl_local_first_buffer_manager.h
@@ -566,6 +566,8 @@ private:
   static const int64_t CONCURRENT_CNT = 2048;
   static const int64_t CHANNEL_HASH_BUCKET_NUM = 64 * 1024;
   static const int64_t MAX_BITSET_CNT = 1024 * 1024;  // 1024 * 1024
+  static const int64_t TP_ENABLE_FAILED_SET_HT = -17;
+  static const int64_t TP_ENABLE_FAILED_SET_FIRST_BUFFER = -18;
   int64_t pins_;
   ObDtlDfoKey dfo_key_;
   ObDtlFirstBufferHashTable<uint64_t, ObDtlCacheBufferInfo> buffer_map_;
@@ -603,6 +605,7 @@ public:
 private:
   static const int64_t CONCURRENT_CNT = 1024;
   static const int64_t BUCKET_NUM = 64 * 1024;
+  static const int64_t TP_ENABLE_FAILED_ALLOC_MEM = -16;
   uint64_t tenant_id_;
   common::ObFIFOAllocator allocator_;
   ObDtlTenantMemManager* tenant_mem_mgr_;
diff --git a/src/sql/dtl/ob_dtl_rpc_channel.cpp b/src/sql/dtl/ob_dtl_rpc_channel.cpp
index 94d6025f9ee40893648290224f1f8b2f8523729a..9ef2d7feb61490908bb2c03ae138bd0cf791c7c6 100644
--- a/src/sql/dtl/ob_dtl_rpc_channel.cpp
+++ b/src/sql/dtl/ob_dtl_rpc_channel.cpp
@@ -188,7 +188,7 @@ int ObDtlRpcChannel::feedup(ObDtlLinkedBuffer*& buffer)
       LOG_WARN("control channel can't drain msg", K(ret));
     }
   } else if (OB_ISNULL(linked_buffer = alloc_buf(buffer->size()))) {
-    ret = OB_REACH_MEMORY_LIMIT;
+    ret = OB_ALLOCATE_MEMORY_FAILED;
     LOG_WARN("failed to allocate buffer", K(ret));
   } else {
     LOG_TRACE("DTL feedup a new msg to msg loop", K(buffer->size()), KP(id_), K(peer_));
diff --git a/src/sql/dtl/ob_dtl_rpc_processor.cpp b/src/sql/dtl/ob_dtl_rpc_processor.cpp
index cbda91c218a93f7c62dc1933d4745a77f2258a83..7feae8a5b14501f9ef7e2cb8fe9753077f10cb9a 100644
--- a/src/sql/dtl/ob_dtl_rpc_processor.cpp
+++ b/src/sql/dtl/ob_dtl_rpc_processor.cpp
@@ -63,7 +63,6 @@ int ObDtlSendMessageP::process_msg(ObDtlRpcDataResponse& response, ObDtlSendArgs
     } else if (arg.buffer_.is_data_msg() && 1 == arg.buffer_.seq_no()) {
       ObDtlLinkedBuffer* buf = &arg.buffer_;
       if (OB_FAIL(DTL.get_dfc_server().cache(arg.buffer_.tenant_id(), arg.chid_, buf))) {
-        ret = tmp_ret;
         LOG_WARN("get DTL channel fail",
             KP(arg.chid_),
             K(ret),
diff --git a/src/sql/dtl/ob_dtl_tenant_mem_manager.cpp b/src/sql/dtl/ob_dtl_tenant_mem_manager.cpp
index d52cc2e4b93f209bd9caa675af668422d6a5631a..44af4b04bf6983ee7784aca1f8279f7109d4fa50 100644
--- a/src/sql/dtl/ob_dtl_tenant_mem_manager.cpp
+++ b/src/sql/dtl/ob_dtl_tenant_mem_manager.cpp
@@ -136,7 +136,7 @@ ObDtlLinkedBuffer* ObDtlTenantMemManager::alloc(int64_t chid, int64_t size)
     ++n_times;
     buf = mem_mgr->alloc(chid, size);
     if (nullptr == buf) {
-      ret = OB_REACH_MEMORY_LIMIT;
+      ret = OB_ALLOCATE_MEMORY_FAILED;
       LOG_WARN("failed to allocate dtl buffer memory", K(ret));
     }
   }