java - HystrixRuntime异常 : TestCommand fallback execution rejected

Question

我使用的是Hystrix 1.5.5版本。当我对更大的负载(例如 1000 线程/秒)进行负载测试时，所有请求都将通过后备方法。与此同时，我也遇到了异常。为什么我会得到下面的异常。 Test Command 是我自定义的 Hystrix 类

Caused by: com.netflix.hystrix.exception.HystrixRuntimeException: TestCommand fallback execution rejected.
        at com.netflix.hystrix.AbstractCommand.handleFallbackRejectionByEmittingError(AbstractCommand.java:1026)
        at com.netflix.hystrix.AbstractCommand.getFallbackOrThrowException(AbstractCommand.java:858)
        at com.netflix.hystrix.AbstractCommand.handleThreadPoolRejectionViaFallback(AbstractCommand.java:976)
        at com.netflix.hystrix.AbstractCommand.access$400(AbstractCommand.java:59)
        at com.netflix.hystrix.AbstractCommand$12.call(AbstractCommand.java:593)
        at com.netflix.hystrix.AbstractCommand$12.call(AbstractCommand.java:587)
        at rx.internal.operators.OperatorOnErrorResumeNextViaFunction$4.onError(OperatorOnErrorResumeNextViaFunction.java:140)
        at rx.internal.operators.OperatorDoOnEach$1.onError(OperatorDoOnEach.java:72)
        at rx.internal.operators.OperatorDoOnEach$1.onError(OperatorDoOnEach.java:72)
        at com.netflix.hystrix.AbstractCommand$HystrixObservableTimeoutOperator$3.onError(AbstractCommand.java:1173)
        at rx.internal.operators.OnSubscribeLift.call(OnSubscribeLift.java:54)
        at rx.internal.operators.OnSubscribeLift.call(OnSubscribeLift.java:30)
        at rx.internal.operators.OnSubscribeLift.call(OnSubscribeLift.java:48)
        at rx.internal.operators.OnSubscribeLift.call(OnSubscribeLift.java:30)
        at rx.internal.operators.OnSubscribeLift.call(OnSubscribeLift.java:48)
        at rx.internal.operators.OnSubscribeLift.call(OnSubscribeLift.java:30)
        at rx.internal.operators.OnSubscribeLift.call(OnSubscribeLift.java:48)

Answer 1

您需要检查执行和回退的 maxConcurrentRequests 值。下面的网址讨论了这个问题。

https://github.com/Netflix/Hystrix/issues/796