Re: [mosquitto-dev] max_queued_messages

[Spiros Ioannou <sivann@xxxxxxxxxxxx>]

Sorry to repeat the question, but we are not sure how to proceed with the design. Is it possible to monitor if the queue size is nearing its limit ? 

 
Best regards,

-Spiros

On 19 October 2015 at 16:25, Spiros Ioannou <sivann@xxxxxxxxxxxx> wrote:

The problem:

* We want to have 1000s of topics with lots of publishers (through 3G remote connections), and 1-2 subscribers (on the DataCenter). 

* There is a requirement of no data loss, QoS will be 2

1) How can the publisher know  if the subscriber is getting the data or if the max_queued_messages is reached (e.g. the subscriber crashed/is restarting/etc) and the previous messages are being dropped? We really wouldn't like to implement an application-level flow control, that should be preferably handled by the queue.

2) Could the broker throttle/stop publishing for channels

3) Is the queue size per topic, publisher or subscriber

4) Can we check the queue size with a SYS query?

What are your suggestions?

Best Regards,

-Spiros

Spiros Ioannou  Infrastructure Lead Engineer inAccess www.inaccess.com M: +30 6973-903808 W: +30 210-6802-358