[zeromq-dev] Calling connect more than once on the same endpoint

[Pieter Hintjens]

I'll pedantically ask that we record problems rather than features.

Problem: SUB accepts multiple connects to same PUB endpoint and result
is nonsensical
Solution: SUB socket should not allow multiple connects to same PUB endpoint.

An issue will just rot, so you may want to find a way to send a patch
to fix this problem.


On Thu, Dec 12, 2013 at 8:09 PM, Trevor Bernard
<trevor.bernard at gmail.com> wrote:
> Should I submit an issue for this feature? I would find it extremely useful.
>
> -Trev
>
> On Wed, Oct 16, 2013 at 11:39 AM, Pieter Hintjens <ph at imatix.com> wrote:
>> Having said that, it is undocumented behavior, and there is no valid
>> use for this in pub-sub (nor in dealer-router, nor in req-rep) and we
>> might want to change the behavior. We do know what endpoints are
>> already used, and could reject duplicate connects to the same
>> endpoint.
>>
>> On Wed, Oct 16, 2013 at 4:26 PM, Pieter Hintjens <ph at imatix.com> wrote:
>>> Yes, this is expected behavior. Each connect is independent. In
>>> pub-sub this produces nonsense results but in other patterns it can be
>>> used to do things like prioritize one node over others (e.g. a PULL
>>> that connects twice to a PUSH).
>>>
>>> On Wed, Oct 16, 2013 at 4:17 PM, Trevor Bernard
>>> <trevor.bernard at gmail.com> wrote:
>>>> I have a PUB/SUB topology and I accidently called connect twice to the
>>>> same PUB endpoint and received duplicate messages. This holds true for
>>>> N connects as well. Is this the correct behaviour?
>>>>
>>>> Simple test that recreates it:
>>>>
>>>>     https://github.com/trevorbernard/double-trouble/blob/master/src/double_trouble/core.clj
>>>>
>>>> -Trev
>>>> _______________________________________________
>>>> zeromq-dev mailing list
>>>> zeromq-dev at lists.zeromq.org
>>>> http://lists.zeromq.org/mailman/listinfo/zeromq-dev
>>>
>>>
>>>
>>> --
>>> -
>>> Pieter Hintjens
>>> CEO of iMatix.com
>>> Founder of ZeroMQ community
>>> blog: http://hintjens.com
>>
>>
>>
>> --
>> -
>> Pieter Hintjens
>> CEO of iMatix.com
>> Founder of ZeroMQ community
>> blog: http://hintjens.com
>> _______________________________________________
>> zeromq-dev mailing list
>> zeromq-dev at lists.zeromq.org
>> http://lists.zeromq.org/mailman/listinfo/zeromq-dev
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