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我使用的是hystrix 1.3.7，我的hystrix命令也有一個回退方法。因此，它的設置如下：HystrixRunTimeException：<operation>超時和回退失敗
public final Optional<ImageData> run() throws Exception {
// does api call to get resized image from a service
}
@Override
public final Optional<ImageData> getFallback() {
// falls back to processing the image locally.
}
不過，我已經意識到有些時候（不是全部）的時候發生超時的豪豬，好像它不執行getFallback方法的邏輯，並拋出HsytrixRuntimeException。這裏是堆棧跟蹤：
com.netflix.hystrix.exception.HystrixRuntimeException: imageResize timed-out and fallback failed.
at com.netflix.hystrix.AbstractCommand.handleTimeoutViaFallback(AbstractCommand.java:980)
at com.netflix.hystrix.AbstractCommand.access$500(AbstractCommand.java:59)
at com.netflix.hystrix.AbstractCommand$12.call(AbstractCommand.java:595)
at com.netflix.hystrix.AbstractCommand$12.call(AbstractCommand.java:587)
at rx.internal.operators.OperatorOnErrorResumeNextViaFunction$1.onError(OperatorOnErrorResumeNextViaFunction.java:77)
at rx.internal.operators.OperatorDoOnEach$1.onError(OperatorDoOnEach.java:70)
at rx.internal.operators.OperatorDoOnEach$1.onError(OperatorDoOnEach.java:70)
at com.netflix.hystrix.AbstractCommand$HystrixObservableTimeoutOperator$1.run(AbstractCommand.java:1121)
at com.netflix.hystrix.strategy.concurrency.HystrixContextRunnable$1.call(HystrixContextRunnable.java:41)
at com.netflix.hystrix.strategy.concurrency.HystrixContextRunnable$1.call(HystrixContextRunnable.java:37)
at com.netflix.hystrix.strategy.concurrency.HystrixContextRunnable.run(HystrixContextRunnable.java:57)
at com.netflix.hystrix.AbstractCommand$HystrixObservableTimeoutOperator$2.tick(AbstractCommand.java:1138)
at com.netflix.hystrix.util.HystrixTimer$1.run(HystrixTimer.java:99)
at java.util.concurrent.Executors$RunnableAdapter.call(Executors.java:511)
at java.util.concurrent.FutureTask.runAndReset(FutureTask.java:308)
at java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.access$301(ScheduledThreadPoolExecutor.java:180)
at java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.run(ScheduledThreadPoolExecutor.java:294)
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)
這是因爲hystrix配置不正確？任何幫助，將不勝感激。
嘗試將代碼放在try/catch中的'getFallback'中並記錄拋出的異常。從日誌中我會說一些引發異常的東西 – Ivan