diff --git a/src/rootserver/ob_root_service.cpp b/src/rootserver/ob_root_service.cpp
index e9588e168b..4c6cf49aaa 100644
--- a/src/rootserver/ob_root_service.cpp
+++ b/src/rootserver/ob_root_service.cpp
@@ -7762,7 +7762,7 @@ int ObRootService::observer_copy_local_index_sstable(const obrpc::ObServerCopyLo
           dest_replica.member_ =
               ObReplicaMember(r->server_, ObTimeUtility::current_time(), r->replica_type_, r->get_memstore_percent());
           dest_replica.unit_id_ = r->unit_id_;
-          data_size = r->data_size_;
+          data_size = arg.data_size_ != 0 ? arg.data_size_ : r->data_size_;
         } else if (r->server_ != data_src) {
           // by pass
         } else if (OB_FAIL(server_manager_.check_server_alive(r->server_, alive))) {
diff --git a/src/share/ob_rpc_struct.cpp b/src/share/ob_rpc_struct.cpp
index d15f052481..fb693fefc6 100644
--- a/src/share/ob_rpc_struct.cpp
+++ b/src/share/ob_rpc_struct.cpp
@@ -2642,7 +2642,7 @@ bool ObCopySSTableBatchArg::is_valid() const
   return is_valid;
 }
 
-OB_SERIALIZE_MEMBER(ObServerCopyLocalIndexSSTableArg, data_src_, dst_, pkey_, index_table_id_, cluster_id_);
+OB_SERIALIZE_MEMBER(ObServerCopyLocalIndexSSTableArg, data_src_, dst_, pkey_, index_table_id_, cluster_id_, data_size_);
 
 bool ObServerCopyLocalIndexSSTableArg::is_valid() const
 {
diff --git a/src/share/ob_rpc_struct.h b/src/share/ob_rpc_struct.h
index 9ddbc2ac9a..3a214e8b8e 100644
--- a/src/share/ob_rpc_struct.h
+++ b/src/share/ob_rpc_struct.h
@@ -3485,12 +3485,12 @@ struct ObServerCopyLocalIndexSSTableArg {
 
 public:
   ObServerCopyLocalIndexSSTableArg()
-      : data_src_(), dst_(), pkey_(), index_table_id_(common::OB_INVALID_ID), cluster_id_(common::OB_INVALID_ID)
+      : data_src_(), dst_(), pkey_(), index_table_id_(common::OB_INVALID_ID), cluster_id_(common::OB_INVALID_ID), data_size_(0)
   {}
 
 public:
   bool is_valid() const;
-  TO_STRING_KV(K_(data_src), K_(dst), K_(pkey), K_(index_table_id), K_(cluster_id));
+  TO_STRING_KV(K_(data_src), K_(dst), K_(pkey), K_(index_table_id), K_(cluster_id), K_(data_size));
 
 public:
   common::ObAddr data_src_;
@@ -3498,6 +3498,7 @@ public:
   common::ObPartitionKey pkey_;
   uint64_t index_table_id_;
   int64_t cluster_id_;
+  int64_t data_size_;
 };
 
 struct ObBackupBatchArg {
diff --git a/src/storage/ob_build_index_scheduler.cpp b/src/storage/ob_build_index_scheduler.cpp
index b679e1cea6..11fbb61ad7 100644
--- a/src/storage/ob_build_index_scheduler.cpp
+++ b/src/storage/ob_build_index_scheduler.cpp
@@ -994,6 +994,8 @@ int ObBuildIndexScheduleTask::send_copy_replica_rpc()
       // if the source and destination are the same, it means that this replica builds the index sstable itself,
       // just retry the scheduling process will get the right way to next state
       ret = OB_EAGAIN;
+    } else if (OB_FAIL(get_data_size(arg.data_size_))) {
+      STORAGE_LOG(WARN, "fail to get data size", K(ret));
     } else if (OB_FAIL(ObMultiVersionSchemaService::get_instance().get_tenant_full_schema_guard(
                    extract_tenant_id(index_id_), schema_guard))) {
       STORAGE_LOG(WARN, "fail to get schema guard", K(ret), K(schema_version_));
@@ -1392,6 +1394,49 @@ int ObBuildIndexScheduleTask::schedule_dag()
   return ret;
 }
 
+int ObBuildIndexScheduleTask::get_data_size(int64_t &data_size)
+{
+  int ret = OB_SUCCESS;
+  ObSqlString sql;
+  SMART_VAR(ObMySQLProxy::MySQLResult, res)
+  {
+    sqlclient::ObMySQLResult *result = NULL;
+    char ip[common::OB_MAX_SERVER_ADDR_SIZE] = "";
+    if (OB_INVALID_ID == index_id_ || !pkey_.is_valid() || !candidate_replica_.is_valid()) {
+      ret = OB_INVALID_ARGUMENT;
+      LOG_WARN("invalid arguments", K(ret), K(index_id_), K(pkey_), K(candidate_replica_));
+    } else if (!candidate_replica_.ip_to_string(ip, sizeof(ip))) {
+      LOG_WARN("fail to convert ObAddr to ip", K(ret));
+    } else if (OB_FAIL(sql.assign_fmt(
+                   "SELECT used_size, MAX(major_version) from %s "
+                   "WHERE tenant_id = %ld AND table_id = %ld AND partition_id = %ld  AND sstable_id = %ld "
+                   "AND svr_ip = '%s' AND svr_port = %d",
+                   OB_ALL_VIRTUAL_STORAGE_STAT_TNAME,
+                   extract_tenant_id(index_id_),
+                   pkey_.get_table_id(),
+                   pkey_.get_partition_id(),
+                   index_id_,
+                   ip,
+                   candidate_replica_.get_port()))) {
+      STORAGE_LOG(WARN, "fail to assign sql", K(ret));
+    } else if (OB_FAIL(GCTX.sql_proxy_->read(res, sql.ptr()))) {
+      LOG_WARN("fail to execute sql", K(ret), K(sql));
+    } else if (OB_ISNULL(result = res.get_result())) {
+      ret = OB_ERR_UNEXPECTED;
+      STORAGE_LOG(WARN, "error unexpected, query result must not be NULL", K(ret));
+    } else if (OB_FAIL(result->next())) {
+      if (OB_LIKELY(OB_ITER_END == ret)) {
+        ret = OB_SUCCESS;
+      } else {
+        LOG_WARN("fail to get next row", K(ret));
+      }
+    } else {
+      EXTRACT_INT_FIELD_MYSQL(*result, "used_size", data_size, int64_t);
+    }
+  }
+  return ret;
+}
+
 int ObBuildIndexScheduleTask::process()
 {
   int ret = OB_SUCCESS;
diff --git a/src/storage/ob_build_index_scheduler.h b/src/storage/ob_build_index_scheduler.h
index ff75ca6fca..37c5bef939 100644
--- a/src/storage/ob_build_index_scheduler.h
+++ b/src/storage/ob_build_index_scheduler.h
@@ -139,6 +139,7 @@ private:
   int get_candidate_source_replica(const bool need_refresh = false);
   int unique_index_checking(const bool is_leader);
   int rollback_state(const int state);
+  int get_data_size(int64_t &data_size);
 
 private:
   static const int64_t COPY_BUILD_INDEX_DATA_TIMEOUT = 10 * 1000 * 1000LL;  // 10s