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：#59

[aa310958153]

找了一个历史的issues：#59

非常感谢您的回答，我了解一下