@Override
    public String toString() {
        return "DefaultRocketMQListenerContainer{" +
            "consumerGroup='" + consumerGroup + '\'' +
            ", namespace='" + namespace + '\'' +
            ", namespaceV2='" + namespaceV2 + '\'' +
            ", nameServer='" + nameServer + '\'' +
            ", topic='" + topic + '\'' +
            ", consumeMode=" + consumeMode +
            ", selectorType=" + selectorType +
            ", selectorExpression='" + selectorExpression + '\'' +
            ", messageModel=" + messageModel + '\'' +
            ", tlsEnable=" + tlsEnable +
            ", instanceName=" + instanceName +
            '}';
    }
Message consume retry strategy in concurrently mode.

-1,no retry,put into DLQ directly
0,broker control retry frequency
>0,client control retry frequency
rocketmq-spring-boot/src/main/java/org/apache/rocketmq/spring/support/DefaultRocketMQListenerContainer.java