private void removeFailedSubscribed(Node node, NotifyListener listener) {
        Set<NotifyListener> listeners = failedSubscribed.get(node);
        if (listeners != null) {
            listeners.remove(listener);
        }
        listeners = failedUnsubscribed.get(node);
        if (listeners != null) {
            listeners.remove(listener);
        }
        Map<NotifyListener, NotifyPair<NotifyEvent, List<Node>>> notified = failedNotified.get(node);
        if (notified != null) {
            notified.remove(listener);
        }
    }
@author Robert HG (254963746@qq.com) on 5/17/15.
lts-core/src/main/java/com/github/ltsopensource/core/registry/FailbackRegistry.java