[zeromq-dev] Check if message is dropped due to HWM at send in ZeroMQ PUB-SUB pattern

[Holger Joukl]

> Von: Pieter Hintjens
>
> By magic coincidence I'm sketching out a proposal for reliable pub-sub.
>
> https://github.com/zeromq/zeps
>

What would be the appeal of having a centralized ZeroMQ broker as opposed
to just using some existing out-of-the box solution, probably (I almost
dare not say it ;-) AMQP-based, e.g. RabbitMQ or QPid?

Apart from the obvious ZeroMQ goodness e.g. ubiquituous client/language
support and
probably a better world in general...

As with the aforementioned (or JMS or anything else using centralized
persistent
queues) this would inevitably introduce a single point of failure that
would then
need to be safeguarded with clustering, high availability, cold/hot
standby, you name it.

Then, of course you'd need to deal with avoiding or recovering from queue
inconsistencies in case of broker failure and resulting switchover and
such.

Looks to me like this is not an easily-solved problem even for some of
those
rather established (as in available for quite a long time) solutions.

If you need a strong notion of guaranteed or certified messaging that is,
as in:
Never lose a single message. Ever.
(Yes I know it's really only "as close as you can get to 'never' and
'ever'")

Best regards,
Holger

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