请问这个是我单测写的有问题吗？我限流设置的是1，但是多线程访问进入了线程数的请求。

[aa310958153]

正常我的理解只会打印一个helloword /**

• 初始化流控规则 */ private static void initFlowRules() {

  List<FlowRule> rules = new ArrayList<FlowRule>();
  FlowRule rule1 = new FlowRule();
  rule1.setResource("HelloWorld");
  
  ClusterFlowConfig config = new ClusterFlowConfig();
  config.setFallbackToLocalWhenFail(true);
  config.setSampleCount(10);
  config.setThresholdType(0);
  config.setWindowIntervalMs(1000);
  rule1.setClusterConfig(config);
  // set limit qps to 20
  rule1.setCount(1);
  rule1.setStrategy(0);
  rule1.setClusterMode(false);
  rule1.setControlBehavior(0);
  rule1.setGrade(RuleConstant.FLOW_GRADE_QPS);
  rule1.setLimitApp("default");
  rules.add(rule1);
  FlowRuleManager.loadRules(rules);

  }

  @Test public void flowRule_TEST() throws InterruptedException {

  // 配置规则.
  initFlowRules();
  
  for (int j = 0; j < 4; j++) {
      new Thread(new Runnable() {
          int i = 0;
  
          @Override
          public void run() {
              for (int k = 0; k < 30; k++) {
                  // 1.5.0 版本开始可以直接利用 try-with-resources 特性 自动回收调用  entry.exit() 配合注解使用 @SentinelResource("HelloWorld")
                  try (Entry entry = SphU.entry(
                      "HelloWorld",
                      EntryType.IN)) {
                      // 被保护的逻辑
                      System.out.println(Thread.currentThread().getId() + "hello world" + (++i));
  
                  } catch (BlockException ex) {
                      i++;
                      // 处理被流控的逻辑
                      System.out.println("blocked!");
  
                  }
              }
  
          }
      }).start();
  
  }
  Thread.sleep(500000000);

  } 打印日志 25hello world1 24hello world1 26hello world1 23hello world1 blocked! blocked! blocked! blocked! blocked! blocked! blocked! blocked! blocked! blocked! blocked! blocked! blocked! blocked! blocked! blocked! blocked!

[aa310958153]

sentinel-core com.alibaba.csp 1.8.8

[S0Louis]

我也好奇这个问题，源码层面是先执行限流规则判断，再累加统计信息，所以多线程场景下会出现这个问题

[S0Louis]

找了一个历史的issues：https://github.com/alibaba/Sentinel/issues/59

[aa310958153]

找了一个历史的issues：#59

非常感谢您的回答，我了解一下