public IClientManager<TEndPoint, SyncDataNodeInternalServiceClient>
      getInternalServiceClientManager() {
    return SYNC_INTERNAL_SERVICE_CLIENT_MANAGER;
  }
This method is called by the write method. So it does not set the timeout parameter.
iotdb-core/datanode/src/main/java/org/apache/iotdb/db/queryengine/plan/Coordinator.java