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Posted to commits@rocketmq.apache.org by "leizhiyuan (via GitHub)" <gi...@apache.org> on 2023/10/19 02:31:03 UTC

[I] 当生产者和消费者的Qos等级不同时，当前似乎没有实现降级 [rocketmq-mqtt]

leizhiyuan opened a new issue, #214:
URL: https://github.com/apache/rocketmq-mqtt/issues/214

   当生产者和消费者的Qos等级不同时，当前似乎没有实现降级
   
   这块社区是如何考虑这个问题的？ 
   
   http://www.taichi-maker.com/homepage/esp8266-nodemcu-iot/iot-tuttorial/mqtt-tutorial/mqtt-qos/
   https://www.emqx.com/zh/blog/an-introduction-to-subscription-options-in-mqtt


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Re: [I] 当生产者和消费者的Qos等级不同时，当前似乎没有实现降级 [rocketmq-mqtt]

Posted by "DongyuanPan (via GitHub)" <gi...@apache.org>.
DongyuanPan commented on issue #214:
URL: https://github.com/apache/rocketmq-mqtt/issues/214#issuecomment-1776684091

   > 设备
   
   可以是生产者、也可以是消费者


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Re: [I] 当生产者和消费者的Qos等级不同时，当前似乎没有实现降级 [rocketmq-mqtt]

Posted by "lizhanhui (via GitHub)" <gi...@apache.org>.
lizhanhui commented on issue #214:
URL: https://github.com/apache/rocketmq-mqtt/issues/214#issuecomment-2327861538

   > 也就是说，是独立的
   
   我觉得你的理解和Spec是有偏差的。应该有个downgrade的过程： https://cedalo.com/blog/understanding-mqtt-qos/
   
   <img width="855" alt="image" src="https://github.com/user-attachments/assets/5a7bd6c1-9af1-4138-9005-cde2e4b70cf1">
   


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Re: [I] 当生产者和消费者的Qos等级不同时，当前似乎没有实现降级 [rocketmq-mqtt]

Posted by "DongyuanPan (via GitHub)" <gi...@apache.org>.
DongyuanPan commented on issue #214:
URL: https://github.com/apache/rocketmq-mqtt/issues/214#issuecomment-1774805595

   也就是说，是独立的


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Re: [I] 当生产者和消费者的Qos等级不同时，当前似乎没有实现降级 [rocketmq-mqtt]

Posted by "leizhiyuan (via GitHub)" <gi...@apache.org>.
leizhiyuan commented on issue #214:
URL: https://github.com/apache/rocketmq-mqtt/issues/214#issuecomment-1774908311

   ![Uploading mmexport1698057384240.jpg…]()
   


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Re: [I] 当生产者和消费者的Qos等级不同时，当前似乎没有实现降级 [rocketmq-mqtt]

Posted by "DongyuanPan (via GitHub)" <gi...@apache.org>.
DongyuanPan commented on issue #214:
URL: https://github.com/apache/rocketmq-mqtt/issues/214#issuecomment-1776677801

   哦哦，可能我们说的不是一个事情。EMQ的意思是，最终的QOS是服务端能够支持的最大QOS和设备请求QOS的最小值。例如服务端只支持QOS1，但是设备发指定了QOS2。这个时候应该直接返回错误的（例如MQTT5.0 协议支持sub的时候，给回复告诉设备服务端能够支持的最大QOS是多少），他们是实现一个降级，就是降级到QOS 1进行通行。


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Re: [I] 当生产者和消费者的Qos等级不同时，当前似乎没有实现降级 [rocketmq-mqtt]

Posted by "leizhiyuan (via GitHub)" <gi...@apache.org>.
leizhiyuan commented on issue #214:
URL: https://github.com/apache/rocketmq-mqtt/issues/214#issuecomment-1774952495

   https://docs.oasis-open.org/mqtt/mqtt/v3.1.1/csd02/mqtt-v3.1.1-csd02.html
   
   <img width="785" alt="WeChatWorkScreenshot_23e4990e-4793-4463-b250-a0078f281208" src="https://github.com/apache/rocketmq-mqtt/assets/2684384/bb6c0dc4-a75a-4e0a-9152-69ec44c58b64">
   


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Re: [I] 当生产者和消费者的Qos等级不同时，当前似乎没有实现降级 [rocketmq-mqtt]

Posted by "leizhiyuan (via GitHub)" <gi...@apache.org>.
leizhiyuan commented on issue #214:
URL: https://github.com/apache/rocketmq-mqtt/issues/214#issuecomment-1824096837

   please assign to @zzjcool


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Re: [I] 当生产者和消费者的Qos等级不同时，当前似乎没有实现降级 [rocketmq-mqtt]

Posted by "leizhiyuan (via GitHub)" <gi...@apache.org>.
leizhiyuan commented on issue #214:
URL: https://github.com/apache/rocketmq-mqtt/issues/214#issuecomment-1774825413

   emqx的实现
   <img width="790" alt="image" src="https://github.com/apache/rocketmq-mqtt/assets/2684384/784702dd-b89b-4354-9317-fd28d9a1d5a3">
   
   是取了消息和订阅者的min，实测也是这样的。
   
   这块mqtt文档中，没有说的很明显。


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Re: [I] 当生产者和消费者的Qos等级不同时，当前似乎没有实现降级 [rocketmq-mqtt]

Posted by "leizhiyuan (via GitHub)" <gi...@apache.org>.
leizhiyuan commented on issue #214:
URL: https://github.com/apache/rocketmq-mqtt/issues/214#issuecomment-1774827367

   mqtt的文档这里确实没有看到有这个说法，可以先保持这样倒也可以。


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Re: [I] 当生产者和消费者的Qos等级不同时，当前似乎没有实现降级 [rocketmq-mqtt]

Posted by "lizhanhui (via GitHub)" <gi...@apache.org>.
lizhanhui closed issue #214: 当生产者和消费者的Qos等级不同时，当前似乎没有实现降级
URL: https://github.com/apache/rocketmq-mqtt/issues/214


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Re: [I] 当生产者和消费者的Qos等级不同时，当前似乎没有实现降级 [rocketmq-mqtt]

Posted by "DongyuanPan (via GitHub)" <gi...@apache.org>.
DongyuanPan commented on issue #214:
URL: https://github.com/apache/rocketmq-mqtt/issues/214#issuecomment-1774804913

   MQTT协议里面client和server角色是不严格区分的，是可以交换的。所以这个QOS我们理解是一个双方交互的一个协议规范，例如需不需要恢复ACK等。所以发送的时候由发送者在message里面设置qos，表示要和服务端以相应的qos进行交互。作为接收者的时候，通过subscribe 告诉服务器，接收者想要以何种qos进行交互，随后服务端给接收者推送消息，就会按照这个进行。


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Re: [I] 当生产者和消费者的Qos等级不同时，当前似乎没有实现降级 [rocketmq-mqtt]

Posted by "DongyuanPan (via GitHub)" <gi...@apache.org>.
DongyuanPan commented on issue #214:
URL: https://github.com/apache/rocketmq-mqtt/issues/214#issuecomment-1776690144

   > https://docs.oasis-open.org/mqtt/mqtt/v3.1.1/csd02/mqtt-v3.1.1-csd02.html
   > 
   > <img alt="WeChatWorkScreenshot_23e4990e-4793-4463-b250-a0078f281208" width="785" src="https://user-images.githubusercontent.com/2684384/277316638-bb6c0dc4-a75a-4e0a-9152-69ec44c58b64.png">
   
   这个就是我之前提到的情况，生产和消费是互相独立的，谁来发、谁来收，就按照谁的QOS为准去交互。即：作为接收者的时候，通过subscribe 告诉服务器，接收者想要以何种qos进行交互，随后服务端给接收者推送消息，就会按照这个进行。


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