HystrixRuntimeException：TestCommand 回退执行被拒绝答案

【问题标题】：HystrixRuntimeException: TestCommand fallback execution rejectedHystrixRuntimeException：TestCommand 回退执行被拒绝
【发布时间】：2017-01-29 07:05:51
【问题描述】：

我使用的是 Hystrix 1.5.5 版本。当我对较大负载（例如 1000 线程/秒）进行负载测试时，所有请求都通过后备方法进行。同时，我也低于异常。为什么我会在以下异常中得到这个。 Test Command 是我的自定义 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)

【问题讨论】：

标签： java jakarta-ee netflix hystrix

【解决方案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

【讨论】：