[mosquitto-dev] R: Single threaded bridge

[Niccolo Battezzati <niccolo.battezzati@xxxxxxxxxxxxxxx>]

Hi Karl,

do you have any additional info about the issue you pointed to (https://github.com/eclipse/mosquitto/issues/41)?
The issue seems to be closed, however it still happens in the 1.4.14 with my setup, as can be seen by the logs I've attached in my previous email.

I would use the raw IP address, instead of the hostname, but unfortunately in our scenario this is not possible since it is not a static and public IP address, and it can change at any time :(

Any idea on how to solve the problem?

Thank you very much,
Niccolò

-----Messaggio originale-----
Da: mosquitto-dev-bounces@xxxxxxxxxxx [mailto:mosquitto-dev-bounces@xxxxxxxxxxx] Per conto di Karl Palsson
Inviato: mercoledì 7 febbraio 2018 10:54
A: General development discussions for the mosquitto project <mosquitto-dev@xxxxxxxxxxx>
Oggetto: Re: [mosquitto-dev] Single threaded bridge



https://github.com/eclipse/mosquitto/issues/41 perhaps?


jianhui zhan <hui6075@xxxxxxxxxxx> wrote:
>  No, Mosquitto implemented with the asynchronous and non-blocking event drive behavior which means try to connect to the remote broker would never block local dispatches. I guess there's some errors else in your case. Do you have the log for further analyze?
> 
> ________________________________
> From: mosquitto-dev-bounces@xxxxxxxxxxx 
> <mosquitto-dev-bounces@xxxxxxxxxxx> on behalf of Niccolo Battezzati 
> <niccolo.battezzati@xxxxxxxxxxxxxxx> Sent:
> Wednesday, February 7, 2018 17:18 To: mosquitto-dev@xxxxxxxxxxx
> Subject: [mosquitto-dev] Single threaded bridge
> 
> 
> Hi all,
> 
> 
> 
> I’m facing the following issue with the moquitto bridge functionality.
> 
> I have a mosquitto bridge that is working as a local broker (with 
> clients on the same machine) and that bridges some topics to/from a 
> remote broker.
> 
> However, if the bridge cannot connect to the remote broker (indeed my 
> operation environment cannot guarantee full internet connectivity 
> always) it periodically hangs for about 30 seconds trying to connect 
> and during this time it does not dispatch messages to the local 
> clients any more. So, basically if the bridge cannot connect to the 
> remote broker, even the local broker functionality is broken.
> 
> 
> 
> I guess the cause of this behavior is that there is only one thread 
> that dispatches messages (local broker) and tries to connect to the 
> remote broker (bridge), and, in my particular case, it remains stucked 
> in the attempt of resolving the remote broker address.
> 
> 
> 
> Do you have any idea on ow to solve this problem? I would need that 
> the local broker could continue to dispatch messages among local 
> clients even if the bridge cannot communicate to the remote broker
> 
> 
> 
> Is there any branch or new version that could address this topic?
> 
> 
> 
> Thank you very much,
> 
> Niccolò
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