ROCKETMQ記錄源碼細節及疑問

1.MessageListener實現最終返回null的話，默認是RECONSUME_LATER

            if (null == status) {
                log.warn("consumeMessage return null, Group: {} Msgs: {} MQ: {}",
                    ConsumeMessageConcurrentlyService.this.consumerGroup,
                    msgs,
                    messageQueue);
                status = ConsumeConcurrentlyStatus.RECONSUME_LATER;
            }