diff --git a/src/rootserver/ddl_task/ob_column_redefinition_task.cpp b/src/rootserver/ddl_task/ob_column_redefinition_task.cpp
index be8721694c..892cd070eb 100644
--- a/src/rootserver/ddl_task/ob_column_redefinition_task.cpp
+++ b/src/rootserver/ddl_task/ob_column_redefinition_task.cpp
@@ -210,6 +210,7 @@ int ObColumnRedefinitionTask::check_build_single_replica(bool &is_end)
 {
   int ret = OB_SUCCESS;
   is_end = false;
+  TCRLockGuard guard(lock_);
   if (OB_UNLIKELY(!is_inited_)) {
     ret = OB_NOT_INIT;
     LOG_WARN("ObColumnRedefinitionTask has not been inited", K(ret));
diff --git a/src/rootserver/ddl_task/ob_ddl_redefinition_task.cpp b/src/rootserver/ddl_task/ob_ddl_redefinition_task.cpp
index 8ac92b5639..e54eabf7d2 100644
--- a/src/rootserver/ddl_task/ob_ddl_redefinition_task.cpp
+++ b/src/rootserver/ddl_task/ob_ddl_redefinition_task.cpp
@@ -2241,3 +2241,9 @@ int ObDDLRedefinitionTask::reap_old_replica_build_task(bool &need_exec_new_inner
   }
   return ret;
 }
+
+int64_t ObDDLRedefinitionTask::get_build_replica_request_time()
+{
+  TCRLockGuard guard(lock_);
+  return build_replica_request_time_;
+}
diff --git a/src/rootserver/ddl_task/ob_ddl_redefinition_task.h b/src/rootserver/ddl_task/ob_ddl_redefinition_task.h
index 96cdc023ea..65eff717e4 100644
--- a/src/rootserver/ddl_task/ob_ddl_redefinition_task.h
+++ b/src/rootserver/ddl_task/ob_ddl_redefinition_task.h
@@ -209,6 +209,7 @@ protected:
   int get_child_task_ids(char *buf, int64_t len);
   int get_estimated_timeout(const share::schema::ObTableSchema *dst_table_schema, int64_t &estimated_timeout);
   int get_orig_all_index_tablet_count(ObSchemaGetterGuard &schema_guard, int64_t &all_tablet_count);
+  int64_t get_build_replica_request_time();
 protected:
   struct DependTaskStatus final
   {
diff --git a/src/rootserver/ddl_task/ob_index_build_task.cpp b/src/rootserver/ddl_task/ob_index_build_task.cpp
index 2364b0e07d..27812e9b8f 100755
--- a/src/rootserver/ddl_task/ob_index_build_task.cpp
+++ b/src/rootserver/ddl_task/ob_index_build_task.cpp
@@ -852,6 +852,12 @@ int ObIndexBuildTask::check_build_single_replica(bool &is_end)
   return ret;
 }
 
+bool ObIndexBuildTask::is_sstable_complete_task_submitted()
+{
+  TCRLockGuard guard(lock_);
+  return is_sstable_complete_task_submitted_;
+}
+
 int ObIndexBuildTask::wait_data_complement()
 {
   int ret = OB_SUCCESS;
@@ -868,7 +874,7 @@ int ObIndexBuildTask::wait_data_complement()
   bool is_request_end = false;
 
   // submit a job to complete sstable for the index table on snapshot_version
-  if (OB_SUCC(ret) && !state_finished && !is_sstable_complete_task_submitted_) {
+  if (OB_SUCC(ret) && !state_finished && !is_sstable_complete_task_submitted()) {
     bool need_exec_new_inner_sql = false;
     if (OB_FAIL(reap_old_replica_build_task(need_exec_new_inner_sql))) {
       if (OB_EAGAIN == ret) {
@@ -885,7 +891,7 @@ int ObIndexBuildTask::wait_data_complement()
 
   DEBUG_SYNC(CREATE_INDEX_REPLICA_BUILD);
 
-  if (OB_SUCC(ret) && !state_finished && is_sstable_complete_task_submitted_) {
+  if (OB_SUCC(ret) && !state_finished && is_sstable_complete_task_submitted()) {
     if (OB_FAIL(check_build_single_replica(is_request_end))) {
       LOG_WARN("fail to check build single replica", K(ret));
     } else if (is_request_end) {
diff --git a/src/rootserver/ddl_task/ob_index_build_task.h b/src/rootserver/ddl_task/ob_index_build_task.h
index d619d4a5da..e7a945c651 100644
--- a/src/rootserver/ddl_task/ob_index_build_task.h
+++ b/src/rootserver/ddl_task/ob_index_build_task.h
@@ -138,6 +138,7 @@ private:
   int check_need_acquire_lob_snapshot(const ObTableSchema *data_table_schema,
                                       const ObTableSchema *index_table_schema,
                                       bool &need_acquire);
+  bool is_sstable_complete_task_submitted();
 private:
   static const int64_t OB_INDEX_BUILD_TASK_VERSION = 1;
   using ObDDLTask::is_inited_;
diff --git a/src/rootserver/ddl_task/ob_table_redefinition_task.cpp b/src/rootserver/ddl_task/ob_table_redefinition_task.cpp
index d5eefd7920..f8d04ac994 100755
--- a/src/rootserver/ddl_task/ob_table_redefinition_task.cpp
+++ b/src/rootserver/ddl_task/ob_table_redefinition_task.cpp
@@ -269,6 +269,7 @@ int ObTableRedefinitionTask::check_build_replica_timeout()
 int ObTableRedefinitionTask::check_build_replica_end(bool &is_end)
 {
   int ret = OB_SUCCESS;
+  TCWLockGuard guard(lock_);
   if (INT64_MAX == complete_sstable_job_ret_code_) {
     // not complete
   } else if (OB_SUCCESS != complete_sstable_job_ret_code_) {
@@ -327,7 +328,7 @@ int ObTableRedefinitionTask::table_redefinition(const ObDDLTaskStatus next_task_
     LOG_WARN("unexpected snapshot", K(ret), KPC(this));
   }
 
-  if (OB_SUCC(ret) && !is_build_replica_end && 0 == build_replica_request_time_) {
+  if (OB_SUCC(ret) && !is_build_replica_end && 0 == get_build_replica_request_time()) {
     bool need_exec_new_inner_sql = false;
     if (OB_FAIL(reap_old_replica_build_task(need_exec_new_inner_sql))) {
       if (OB_EAGAIN == ret) {
@@ -340,6 +341,7 @@ int ObTableRedefinitionTask::table_redefinition(const ObDDLTaskStatus next_task_
     } else if (OB_FAIL(send_build_replica_request())) {
       LOG_WARN("fail to send build replica request", K(ret));
     } else {
+      TCWLockGuard guard(lock_);
       build_replica_request_time_ = ObTimeUtility::current_time();
     }
   }