Feign调用异常[Running, pool size = 10, active threads = 10, queued tasks = 0, completed tasks = n]
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java.util.concurrent.RejectedExecutionException: Task java.util.concurrent.FutureTask@1e882e6a rejected from java.util.concurrent.ThreadPoolExecutor@28cdff71[Running, pool size = 10, active threads = 10, queued tasks = 0, completed tasks = 25]
at java.util.concurrent.ThreadPoolExecutor$AbortPolicy.rejectedExecution(ThreadPoolExecutor.java:2063) ~[na:1.8.0_191]
at java.util.concurrent.ThreadPoolExecutor.reject(ThreadPoolExecutor.java:830) [na:1.8.0_191]
at java.util.concurrent.ThreadPoolExecutor.execute(ThreadPoolExecutor.java:1379) [na:1.8.0_191]
at java.util.concurrent.AbstractExecutorService.submit(AbstractExecutorService.java:112) ~[na:1.8.0_191]
at com.netflix.hystrix.strategy.concurrency.HystrixContextScheduler$ThreadPoolWorker.schedule(HystrixContextScheduler.java:172) ~[hystrix-core-1.5.18.jar:1.5.18]
at com.netflix.hystrix.strategy.concurrency.HystrixContextScheduler$HystrixContextSchedulerWorker.schedule(HystrixContextScheduler.java:106) ~[hystrix-core-1.5.18.jar:1.5.18]
at rx.internal.operators.OperatorSubscribeOn.call(OperatorSubscribeOn.java:50) ~[rxjava-1.3.8.jar:1.3.8]
at rx.internal.operators.OperatorSubscribeOn.call(OperatorSubscribeOn.java:30) ~[rxjava-1.3.8.jar:1.3.8]
at rx.internal.operators.OnSubscribeLift.call(OnSubscribeLift.java:48) ~[rxjava-1.3.8.jar:1.3.8]
at rx.internal.operators.OnSubscribeLift.call(OnSubscribeLift.java:30) ~[rxjava-1.3.8.jar:1.3.8]
at rx.Observable.unsafeSubscribe(Observable.java:10327) ~[rxjava-1.3.8.jar:1.3.8]原因是Feign调用并发量太大，打满了Hystrix的线程池，触发了线程池隔离。
解决办法：
1.对请求限流
2.修改Hystrix的线程池参数：Spring Cloud Hystrix 线程池隔离参数配置_抓手的博客-CSDN博客
更多Hystrix参数配置可参考：hystrix 配置_Lewis·fk的博客-CSDN博客_hystrix配置文件配置
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