Question

调用gRPC方法时偶尔会出现取消错误。

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，它通常可以工作。客户端发送一条消息，服务器收到它没有问题。

但是这个电话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，服务器还是会收到请求。但是有时服务器会错过它。

这甚至不是DEADLINE_EXCEEDED例外，它仅引发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这样。

总结：

随机

gRPC调用出现CANCELLED错误。
发生错误时，服务器有时会接到电话，而有时不会。

Answer 1

grpc-java支持自动期限和取消传播。当入站RPC导致出站RPC时，这些出站RPC会继承入站RPC的期限。另外，如果取消了入站RPC，则出站RPC也将被取消。

这是通过/** * @fileoverview added by tsickle * @suppress {checkTypes,extraRequire,missingOverride,missingReturn,unusedPrivateMembers,uselessCode} checked by tsc */ import { CommonModule } from "@angular/common"; import { NgModule } from "@angular/core"; import { TekButton } from "./button"; var TekButtonModule = /** @class */ (function () { function TekButtonModule() { } TekButtonModule.decorators = [ { type: NgModule, args: [{ declarations: [ TekButton ], exports: [ TekButton ], imports: [ CommonModule ] },] } ]; return TekButtonModule; }()); export { TekButtonModule }; //# sourceMappingURL=data:application/json;base64实现的。如果您要执行的出站RPC的寿命比入站RPC的寿命更长，则应使用Context.fork()。

sed -i ':a;/;[^;]\{25\}$/!s/$/ /;ta' file

gRPC：RPC调用上的随机CANCELED异常

1 个答案: