[英]gRPC future callback got exception:StatusRuntimeException: CANCELLED
[英]gRPC: Random CANCELLED exception on RPC calls
调用 gRPC 方法时,我偶尔会遇到取消错误。
这是我的客户端代码(使用 grpc-java 1.22.0 库):
public class MyClient {
private static final Logger logger = LoggerFactory.getLogger(MyClient.class);
private ManagedChannel channel;
private FooGrpc.FooStub fooStub;
private final StreamObserver<Empty> responseObserver = new StreamObserver<>() {
@Override
public void onNext(Empty value) {
}
@Override
public void onError(Throwable t) {
logger.error("Error: ", t);
}
@Override
public void onCompleted() {
}
};
public MyClient() {
this.channel = NettyChannelBuilder
.forAddress(host, port)
.sslContext(GrpcSslContexts.forClient().trustManager(certStream).build())
.build();
var pool = Executors.newCachedThreadPool(
new ThreadFactoryBuilder().setNameFormat("foo-pool-%d").build());
this.fooStub = FooGrpc.newStub(channel)
.withExecutor(pool);
}
public void callFoo() {
fooStub.withDeadlineAfter(500L, TimeUnit.MILLISECONDS)
.myMethod(whatever, responseObserver);
}
}
当我调用callFoo()
方法时,它通常有效。 客户端发送消息,服务器接收它没有问题。
但是这个调用偶尔会给我一个错误:
io.grpc.StatusRuntimeException: CANCELLED: io.grpc.Context was cancelled without error
at io.grpc.Status.asRuntimeException(Status.java:533) ~[handler-0.0.1-SNAPSHOT.jar:?]
at io.grpc.stub.ClientCalls$StreamObserverToCallListenerAdapter.onClose(ClientCalls.java:442) [handler-0.0.1-SNAPSHOT.jar:?]
at io.grpc.PartialForwardingClientCallListener.onClose(PartialForwardingClientCallListener.java:39) [handler-0.0.1-SNAPSHOT.jar:?]
at io.grpc.ForwardingClientCallListener.onClose(ForwardingClientCallListener.java:23) [handler-0.0.1-SNAPSHOT.jar:?]
at io.grpc.ForwardingClientCallListener$SimpleForwardingClientCallListener.onClose(ForwardingClientCallListener.java:40) [handler-0.0.1-SNAPSHOT.jar:?]
at io.grpc.internal.CensusStatsModule$StatsClientInterceptor$1$1.onClose(CensusStatsModule.java:700) [handler-0.0.1-SNAPSHOT.jar:?]
at io.grpc.PartialForwardingClientCallListener.onClose(PartialForwardingClientCallListener.java:39) [handler-0.0.1-SNAPSHOT.jar:?]
at io.grpc.ForwardingClientCallListener.onClose(ForwardingClientCallListener.java:23) [handler-0.0.1-SNAPSHOT.jar:?]
at io.grpc.ForwardingClientCallListener$SimpleForwardingClientCallListener.onClose(ForwardingClientCallListener.java:40) [handler-0.0.1-SNAPSHOT.jar:?]
at io.grpc.internal.CensusTracingModule$TracingClientInterceptor$1$1.onClose(CensusTracingModule.java:399) [handler-0.0.1-SNAPSHOT.jar:?]
at io.grpc.internal.ClientCallImpl.closeObserver(ClientCallImpl.java:507) [handler-0.0.1-SNAPSHOT.jar:?]
at io.grpc.internal.ClientCallImpl.access$300(ClientCallImpl.java:66) [handler-0.0.1-SNAPSHOT.jar:?]
at io.grpc.internal.ClientCallImpl$ClientStreamListenerImpl.close(ClientCallImpl.java:627) [handler-0.0.1-SNAPSHOT.jar:?]
at io.grpc.internal.ClientCallImpl$ClientStreamListenerImpl.access$700(ClientCallImpl.java:515) [handler-0.0.1-SNAPSHOT.jar:?]
at io.grpc.internal.ClientCallImpl$ClientStreamListenerImpl$1StreamClosed.runInternal(ClientCallImpl.java:686) [handler-0.0.1-SNAPSHOT.jar:?]
at io.grpc.internal.ClientCallImpl$ClientStreamListenerImpl$1StreamClosed.runInContext(ClientCallImpl.java:675) [handler-0.0.1-SNAPSHOT.jar:?]
at io.grpc.internal.ContextRunnable.run(ContextRunnable.java:37) [handler-0.0.1-SNAPSHOT.jar:?]
at io.grpc.internal.SerializingExecutor.run(SerializingExecutor.java:123) [handler-0.0.1-SNAPSHOT.jar:?]
at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1128) [?:?]
at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:628) [?:?]
at java.lang.Thread.run(Thread.java:834) [?:?]
奇怪的是,即使调用在客户端出现错误,服务器也确实收到了请求,主要是。 但有时服务器会错过它。
它甚至不是DEADLINE_EXCEEDED
异常,它只是抛出CANCELLED: io.grpc.Context was cancelled without error
。 没有提供其他描述,所以我无法弄清楚为什么会发生这种情况。
总结一下:
CANCELLED
错误。grpc-java 支持自动截止日期和取消传播。 当入站 RPC 导致出站 RPC 时,这些出站 RPC 将继承入站 RPC 的截止日期。 此外,如果入站 RPC 被取消,出站 RPC 也将被取消。
这是通过io.grpc.Context
实现的。 如果您执行的出站 RPC 想要比入站 RPC 的存活时间更长,则应该使用Context.fork()
。
public void myRpcMethod(Request req, StreamObserver<Response> observer) {
// ctx has all the values as the current context, but
// won't be cancelled
Context ctx = Context.current().fork();
// Set ctx as the current context within the Runnable
ctx.run(() -> {
// Can start asynchronous work here that will not
// be cancelled when myRpcMethod returns
});
observer.onNext(generateReply());
observer.onCompleted();
}
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