com.google.api.gax.grpc.ApiException：io.grpc.StatusRuntimeException：DEADLINE_EXCEEDED

Question

最近，我使用google cloud vision api检测图片标签，点击this ，我为我的应用程序设置凭据以验证其对服务的身份并获得执行任务的授权，然后按照API文档，编写如下代码：

ImageAnnotatorClient vision= ImageAnnotatorClient.create();
        ByteString imgBytes = ByteString.readFrom(new FileInputStream("my_image_path.jpg"));
        List<AnnotateImageRequest> requests = new ArrayList<AnnotateImageRequest>();
        Image img = Image.newBuilder().setContent(imgBytes).build();

         Feature feat = Feature.newBuilder().setType(Type.LABEL_DETECTION).build();
         AnnotateImageRequest request = AnnotateImageRequest.newBuilder()
                    .addFeatures(feat)
                    .setImage(img)
                    .build();
                requests.add(request);
                BatchAnnotateImagesResponse response = vision.batchAnnotateImages(requests);
                List<AnnotateImageResponse> responses = response.getResponsesList();

                for (AnnotateImageResponse res : responses) {
                    if (res.hasError()) {
                      System.out.printf("Error: %s\n", res.getError().getMessage());
                      return;
                    }
                    for (EntityAnnotation annotation : res.getLabelAnnotationsList()) {
                        annotation.getAllFields().forEach((k, v)->System.out.printf("%s : %s\n", k, v.toString()));
                      }
                }

我收到错误：

Exception in thread "main" com.google.api.gax.grpc.ApiException: io.grpc.StatusRuntimeException: DEADLINE_EXCEEDED
    at com.google.api.gax.grpc.ExceptionTransformingCallable$ExceptionTransformingFuture.onFailure(ExceptionTransformingCallable.java:109)
    at com.google.api.gax.core.ApiFutures$1.onFailure(ApiFutures.java:52)
    at com.google.common.util.concurrent.Futures$6.run(Futures.java:1310)
    at com.google.common.util.concurrent.MoreExecutors$DirectExecutor.execute(MoreExecutors.java:457)
    at com.google.common.util.concurrent.ExecutionList.executeListener(ExecutionList.java:156)
    at com.google.common.util.concurrent.ExecutionList.execute(ExecutionList.java:145)
    at com.google.common.util.concurrent.AbstractFuture.setException(AbstractFuture.java:202)
    at io.grpc.stub.ClientCalls$GrpcFuture.setException(ClientCalls.java:466)
    at io.grpc.stub.ClientCalls$UnaryStreamToFuture.onClose(ClientCalls.java:442)
    at io.grpc.internal.ClientCallImpl$ClientStreamListenerImpl.close(ClientCallImpl.java:481)
    at io.grpc.internal.ClientCallImpl$ClientStreamListenerImpl.access$600(ClientCallImpl.java:398)
    at io.grpc.internal.ClientCallImpl$ClientStreamListenerImpl$1StreamClosed.runInContext(ClientCallImpl.java:513)
    at io.grpc.internal.ContextRunnable.run(ContextRunnable.java:52)
    at io.grpc.internal.SerializingExecutor$TaskRunner.run(SerializingExecutor.java:154)
    at java.util.concurrent.Executors$RunnableAdapter.call(Executors.java:511)
    at java.util.concurrent.FutureTask.run(FutureTask.java:266)
    at java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.access$201(ScheduledThreadPoolExecutor.java:180)
    at java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.run(ScheduledThreadPoolExecutor.java:293)
    at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1142)
    at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:617)
    at java.lang.Thread.run(Thread.java:745)
Caused by: io.grpc.StatusRuntimeException: DEADLINE_EXCEEDED
    at io.grpc.Status.asRuntimeException(Status.java:545)
    ... 13 more

为什么？