Google Pubsub：无法使用：该服务无法满足您的请求

Question

我正在使用Java库从我的代码中订阅订阅。使用sbt： "com.google.cloud" % "google-cloud-pubsub" % "0.24.0-beta"

我按照此指南编写了订阅者：https : //cloud.google.com/pubsub/docs/pull

 val projectId = "test-topic"
 val subscriptionId = "test-sub"

def main(args: Array[String]): Unit = {
 val subscriptionName = SubscriptionName.create(projectId, subscriptionId)
 val subscriber = Subscriber.defaultBuilder(subscriptionName, new PastEventMessageReceiver()).build()
 subscriber.startAsync()
 System.in.read()
}


class PastEventMessageReceiver extends MessageReceiver {
  override def receiveMessage(message: PubsubMessage, consumer: AckReplyConsumer): Unit = {
  println(message)
  consumer.ack()
}

效果很好，我可以提取已发布的消息，但每分钟多次在我的日志中不断看到此错误。

 com.google.cloud.pubsub.v1.StreamingSubscriberConnection$1 onFailure
WARNING: Terminated streaming with exception
io.grpc.StatusRuntimeException: UNAVAILABLE: The service was unable to fulfill your request. Please try again. [code=8a75]
    at io.grpc.Status.asRuntimeException(Status.java:526)
    at io.grpc.stub.ClientCalls$StreamObserverToCallListenerAdapter.onClose(ClientCalls.java:385)
    at io.grpc.internal.ClientCallImpl.closeObserver(ClientCallImpl.java:422)
    at io.grpc.internal.ClientCallImpl.access$300(ClientCallImpl.java:61)
    at io.grpc.internal.ClientCallImpl$ClientStreamListenerImpl.close(ClientCallImpl.java:504)
    at io.grpc.internal.ClientCallImpl$ClientStreamListenerImpl.access$600(ClientCallImpl.java:425)
    at io.grpc.internal.ClientCallImpl$ClientStreamListenerImpl$1StreamClosed.runInContext(ClientCallImpl.java:536)
    at io.grpc.internal.ContextRunnable.run(ContextRunnable.java:37)
    at io.grpc.internal.SerializingExecutor.run(SerializingExecutor.java:102)
    at java.util.concurrent.Executors$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)

当我第一次运行该应用程序时，有一个小的延迟（大约1-2分钟），在此我看不到该错误，在延迟之后，我每分钟会看到多次。我的应用程序似乎仍然能够使消息难以处理。

Answer 1

此消息是 Google Cloud Pub/Sub 库中的内部错误，当发送到 Pub/Sub 服务器的请求出现断开连接或可重试错误时会发生该错误。客户端库应该无缝地重新创建连接并重试这些错误的请求。在客户端库的 0.26.0-beta 及更高版本中，除非您将日志级别设置为 FINE ，否则这些错误不应再打印在日志中。通常，发生此错误后，消息仍应继续发送到您的 MessageReceiver。客户端库本身无法重试的任何错误（例如，未找到订阅时）都会传播回调用者。