while (itr.hasNext()) {
MessageQueue mq = itr.next();
if (topic.equals(mq.getTopic())) {
ProcessQueue pq = processQueueTable.get(mq);
pq.setDroped(true);
pq.clear();
}
}
// 更新消费队列的 offset 并提交到 broker
Iterator<MessageQueue> iterator = offsetTable.keySet().iterator();