LoadBalancedRSocket引发的ConcurrentModificationException

[hupeiD]

Describe the bug
程序在运行过程中，与Broker集群断开连接后，每一次发出请求都报ConcurrentModificationException。

Environment

• Alibaba RSocket Broker version: 1.1.5
• Operating System version: Linux
• Java version: 11.0.17

Steps to reproduce this issue

1. 在不知名的原因下，客户端与服务端断连
2. 断连后每一次请求，都触发了com.alibaba.rsocket.loadbalance.LoadBalancedRSocket.onRSocketClosed(RSocket, Throwable)
3. 然后抛出了ConcurrentModificationException
4. 并且一直重连失败

Expected Result

当发出请求后，根据LoadBalancedRSocket.CONNECTION_ERROR_PREDICATE捕获到了异常之后，能安全的关闭对应的连接，并在接下来重连成功。

Actual Result

持续触发ConcurrentModificationException，并无法重连

2024-03-22 06:31:44.988 -ERROR 1 --- [     parallel-4] c.a.r.loadbalance.LoadBalancedRSocket    : RST-500407: RSocket close by peer: tcp://172.23.64.104:9999
2024-03-22 06:31:44.989 -ERROR 1 --- [     parallel-4] reactor.core.publisher.Operators         : Operator called default onErrorDropped

reactor.core.Exceptions$ErrorCallbackNotImplemented: java.util.ConcurrentModificationException
Caused by: java.util.ConcurrentModificationException: null
	at java.base/java.util.HashMap$HashIterator.nextNode(HashMap.java:1511)
	at java.base/java.util.HashMap$EntryIterator.next(HashMap.java:1544)
	at java.base/java.util.HashMap$EntryIterator.next(HashMap.java:1542)
	at com.alibaba.rsocket.loadbalance.LoadBalancedRSocket.onRSocketClosed(LoadBalancedRSocket.java:314)
	at com.alibaba.rsocket.loadbalance.LoadBalancedRSocket.lambda$requestResponse$8(LoadBalancedRSocket.java:201)
	at reactor.core.publisher.Mono.lambda$onErrorResume$32(Mono.java:3887)
	at reactor.core.publisher.FluxOnErrorResume$ResumeSubscriber.onError(FluxOnErrorResume.java:94)
	at io.rsocket.core.RequestResponseRequesterMono.sendFirstPayload(RequestResponseRequesterMono.java:190)
	at io.rsocket.core.RequestResponseRequesterMono.request(RequestResponseRequesterMono.java:152)
	at reactor.core.publisher.Operators$MultiSubscriptionSubscriber.set(Operators.java:2159)
	at reactor.core.publisher.FluxOnErrorResume$ResumeSubscriber.onSubscribe(FluxOnErrorResume.java:74)
	at io.rsocket.core.RequestResponseRequesterMono.subscribe(RequestResponseRequesterMono.java:130)
	at reactor.core.publisher.Mono.subscribe(Mono.java:4490)
	at reactor.core.publisher.FluxFlatMap$FlatMapMain.onNext(FluxFlatMap.java:426)
	at reactor.core.publisher.FluxInterval$IntervalRunnable.run(FluxInterval.java:125)
	at reactor.core.scheduler.PeriodicWorkerTask.call(PeriodicWorkerTask.java:59)
	at reactor.core.scheduler.PeriodicWorkerTask.run(PeriodicWorkerTask.java:73)
	at java.base/java.util.concurrent.Executors$RunnableAdapter.call(Executors.java:515)
	at java.base/java.util.concurrent.FutureTask.runAndReset(FutureTask.java:305)
	at java.base/java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.run(ScheduledThreadPoolExecutor.java:305)
	at java.base/java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1128)
	at java.base/java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:628)
	at java.base/java.lang.Thread.run(Thread.java:829)
	Suppressed: java.nio.channels.ClosedChannelException: null

而且我注意到了这里的activeSockets使用的HashMap而非ConcurrentHashMap

    public void onRSocketClosed(RSocket rsocket, @Nullable Throwable cause) {
        for (Map.Entry<String, RSocket> entry : activeSockets.entrySet()) {
            if (entry.getValue() == rsocket) {
                onRSocketClosed(entry.getKey(), entry.getValue(), null);
            }
        }
        if (!rsocket.isDisposed()) {
            try {
                rsocket.dispose();
            } catch (Exception ignore) {

            }
        }
    }

[hupeiD]

更正一下，并非一直重连不上，而是重连上了还是一直断连