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Posted to commits@rocketmq.apache.org by "DongyuanPan (via GitHub)" <gi...@apache.org> on 2024/03/05 12:39:56 UTC
[I] [Enhancement] Implement Flow control in MQTT 5.0 [rocketmq-mqtt]
DongyuanPan opened a new issue, #246:
URL: https://github.com/apache/rocketmq-mqtt/issues/246
Allow the Client and Server to independently specify the number of outstanding reliable messages (QoS>0) they allow. The sender pauses sending such messages to stay below this quota. This is used to limit the rate of reliable messages, and to limit how many are in flight at one time.
branch: develop_mqtt5.0
FYI:https://docs.oasis-open.org/mqtt/mqtt/v5.0/mqtt-v5.0.html
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Re: [I] [Enhancement] Implement Flow control in MQTT 5.0 [rocketmq-mqtt]
Posted by "YxAc (via GitHub)" <gi...@apache.org>.
YxAc commented on issue #246:
URL: https://github.com/apache/rocketmq-mqtt/issues/246#issuecomment-2096233300
I will work on this recently.
By the doc of mqtt v5.0, the flow control just limit `publish qps`, not including `connection limit` and `publish bytes limit`, right? Do I need to provide a design document?
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Re: [I] [Enhancement] Implement Flow control in MQTT 5.0 [rocketmq-mqtt]
Posted by "DongyuanPan (via GitHub)" <gi...@apache.org>.
DongyuanPan commented on issue #246:
URL: https://github.com/apache/rocketmq-mqtt/issues/246#issuecomment-2121927977
Looking forward to the implementation of this feature
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Re: [I] [Enhancement] Implement Flow control in MQTT 5.0 [rocketmq-mqtt]
Posted by "DongyuanPan (via GitHub)" <gi...@apache.org>.
DongyuanPan commented on issue #246:
URL: https://github.com/apache/rocketmq-mqtt/issues/246#issuecomment-2100022188
> I will work on this recently.
>
> By the doc of mqtt v5.0, the flow control just limit `publish qps`, not including `connection limit` and `publish bytes limit`, right? Do I need to provide a design document?
Yes, and just focus on PUBLISH packet at QoS > 0. It should be noted that this restriction interacts through CONN, CONNACK, so for the server side, how to reject more Publish packets, and how to control the server to send Publish packets to the client
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Re: [I] [Enhancement] Implement Flow control in MQTT 5.0 [rocketmq-mqtt]
Posted by "YxAc (via GitHub)" <gi...@apache.org>.
YxAc commented on issue #246:
URL: https://github.com/apache/rocketmq-mqtt/issues/246#issuecomment-2119944009
I will implement this for two parts, around the MQTT Broker.
- Client -> Broker Publish process
- Broker -> Client Publish process
**Prerequisites**
ChannelManager supports flow control interface
For Broker sending and receiving messages, define the following functions
- `boolean publishReceiveRefill()`
- `boolean publishReceiveTryAcquire()`
- `boolean publishSendRefill()`
- `boolean publishSendTryAcquire()`
Define `Map <String, AtomicInteger> pubReceiveQuotaMap` for the flow control from client publish to server, and count the sending quota for each client.
Define `Map <String, AtomicInteger> pubSendQuotaMap` for the flow control from server publish to client, and count the receiving quota for each client.
Clear the client's flow control quota during Channel cleanup.
**Part I: Client -> Broker**
- When a client initiates `CONN`, the Broker sets the maximum quota that can be received by the server when it returns `CONNACK`.
- When Broker receives a `PUBLISH`, the client's send quota(i.e., Broker ReceiveQuota) decrements by 1, if Broker receives more than the maximum quota, it uses a `DISCONNECT` packet with Reason Code `0x93` to close the channel.
- When Broker sends `PUBACK` or `PUBCOMP`, the sending quota of the client increments by 1.
- When Broker sends `PUBREC` and the return code is greater than or equal to `0x80/128`, the sending quota of the client increments by 1.
**Part II: Broker -> Client**
- When a client initiates a `CONN`, the Broker gets the receive maximum the client can receive.
- When Broker sends `PUBLISH`, the sending quota(i.e., Broker SendQuota) of the client decrements by 1.
- When Broker receives `PUBACK` or `PUBCOMP`, the sending quota of the client increments by 1.
- When Broker receives `PUBREC` and the return code is greater than or equal to `0x80/128`, the sending quota of the client increments by 1.
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