message: MasterSession should throw error if use_per_session_threads or session_inter_op_thread_pool is set.
diff: @@ -1017,6 +1017,11 @@ void MasterSession::UpdateLastAccessTime() {
  Status MasterSession::Create(GraphDef* graph_def,
  const WorkerCacheFactoryOptions& options) {
  + if (session_opts_.config.use_per_session_threads() ||
  + session_opts_.config.session_inter_op_thread_pool_size() > 0) {
  + return errors::InvalidArgument(
  + "Distributed session does not support session thread pool options.");
  + }
  if (session_opts_.config.graph_options().place_pruned_graph()) {
  // TODO(b/29900832): Fix this or remove the option.
  LOG(WARNING) << "Distributed session does not support the "
  