[zeromq-dev] Is Pub/Sub unreliable

[Pieter Hintjens]

One solution to this is a last-value cache whereby subscribers get the
last version of messages matching their subscriptions, when they
connect.

On Wed, Mar 10, 2010 at 2:55 PM, Martin Sustrik <sustrik at 250bpm.com> wrote:
> gonzalo diethelm wrote:
>
>> Ok, that makes perfect sense now. And the reason this is not apparent
>> for Upstream / Downstream sockets is because they queue any unsent
>> messages, so all messages are eventually sent after a successful
>> reconnection, right?
>
> Exactly.
>
>> So I guess it is not a bad idea to always add a small sleep time (say,
>> 200 ms) after binding to a PUB socket. What do you think?
>
> Why not. That way you'll guarantee that SUBs have some time to connect
> before actual transmission begins.
>
> However, don't expect it to be 100% reliable. Say a hick-up in the
> network that would delay connection establishment by 200ms would cause
> the same problem.
>
> Martin
>
>
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