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Subject: [OASIS Issue Tracker] (MQTT-257) Flow Control
[ https://issues.oasis-open.org/browse/MQTT-257?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=63506#comment-63506 ] Ed Briggs commented on MQTT-257: -------------------------------- Hi Ken. The direction to raise it as a new JIRA made in the TC meeting was based on a representation that the JIRA had been closed. However, when I examined the JIRA earlier, I saw it was not closed, but was still assigned to the editors (marked resolved, but not closed). Accordingly, the process as I understand it is that updates are to be added to the existing JIRA, which is want I did. This is because (as I understand it) until it is closed, the editors are still working on it and it is not finished. I think we may need to clarify the process further. Cheers, Ed > Flow Control > ------------ > > Key: MQTT-257 > URL: https://issues.oasis-open.org/browse/MQTT-257 > Project: OASIS Message Queuing Telemetry Transport (MQTT) TC > Issue Type: Bug > Components: futures > Affects Versions: 5 > Reporter: Peter Niblett > Assignee: Andrew Banks > Fix For: 5 > > > Developers sometimes ask if there's a way to slow down an MQTT message sender to stop it sending PUBLISH packets faster than the receiver (be it a server or client) is able to process them. > The receiver can apply back pressure at the TCP/IP level (if it's a TCP/IP transport) or - for QOS 1 and QOS2 - it can delay sending acks so that eventually the sender's inflight message window will fill up, but these mechanisms are a bit crude, and the receiver has no in-band way of letting the sender know what rate is acceptable to it. > We need to decide whether this is a problem that affects a significant number of existing or envisaged real-life applications (as opposed to performance and stress tests) -- This message was sent by Atlassian JIRA (v6.2.2#6258)
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