springcloud 报错：java.util.concurrent.RejectedExecutionException: Rejected command

• 问题分析：
  微服务中A启动多个线程去访问微服务B，服务A线程超过一定数量报错

springcloud 项目报错：

java.util.concurrent.RejectedExecutionException: Rejected command because thread-pool queueSize is at rejection threshold.
at com.netflix.hystrix.strategy.concurrency.HystrixContextScheduler$HystrixContextSchedulerWorker.schedule(HystrixContextScheduler.java:103) ~[hystrix-core-1.5.12.jar:1.5.12]

微服务之间的调用经过Hystrix，线程池默认配置如下：

分析：服务A启动20个线程调用服务B,但是默认10个，所以报错
解决：二选一

1. 增大线程池中的配置
   
2. 线程启动数量减少，服务A中的线程池配置减少到10以下,如下配置为8个

    @Bean
    public Executor defaultServiceExecutor() {
        ThreadPoolTaskExecutor executor = new ThreadPoolTaskExecutor();
        //cpu数量 * 2
        //int corePoolSize = Runtime.getRuntime().availableProcessors() * 2;
        //executor.setCorePoolSize(corePoolSize);
        executor.setCorePoolSize(8);
        executor.setMaxPoolSize(8);
        executor.setQueueCapacity(100);
        executor.setThreadNamePrefix("executor-io-");
        executor.setRejectedExecutionHandler(new CallerRunsPolicy());
        executor.initialize();
        return executor;
    }

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