@Override public void modifyAckDeadline( SubscriptionPath subscription, List<String> ackIds, int deadlineSeconds) throws IOException { ModifyAckDeadlineRequest request = ModifyAckDeadlineRequest.newBuilder() .setSubscription(subscription.getPath()) .addAllAckIds(ackIds) .setAckDeadlineSeconds(deadlineSeconds) .build(); subscriberStub().modifyAckDeadline(request); // ignore Empty result. }