[zeromq-dev] Disable resend of Publisher after reconnection

[Doron Somech]

For how long are you disconnecting the network?

Just for the experiment try to set SNDBUF of the publisher to zero, along
with immediate to 1 and send highwatermark to 1. I think it should work.
However I dont think it is a good configuration. My suggestion is to have a
time field on each message, save the diff on first message and check it on
every message. If it too high drop the connection.
On Aug 27, 2015 4:13 PM, "KIU Shueng Chuan" <nixchuan at gmail.com> wrote:

> You could use the tcp keepalive socket options to make the tcp connection
> drop faster once you have unplugged your cable. That should cause the
> queued packets to be dropped.
>
> Or your subscriber could drain the socket of messages by reading it until
> it would block and only process the last one.
> On Aug 27, 2015 20:42, "Bachmair Florian - flexSolution GmbH" <
> florian.bachmair at flexsolution.eu> wrote:
>
>> ok, thank you!
>>
>> I have to think about that, because I want to use curve as well, and
>> therefore I would need tcp...
>>
>> Am 27.08.2015 um 14:12 schrieb Sergey Zinov:
>>
>> Seems like that should be the case. TCP is a reliable protocol, it
>> buffers all data till it acknowledged by receiver and resend when needed.
>> Switch to the UDP if don't need that reliability.
>>
>> On 27.08.2015 14:07, Bachmair Florian - flexSolution GmbH wrote:
>>
>> This does not work either :/
>>
>> I'm unsing PUB/SUB via tcp.
>>
>> I have captured the tcp connection with tcpdump and I saw that after I
>> unplug the cable I get tcp retransmission packets.
>>
>> May this be more a behaviour of tcp itself than of zmq?
>>
>>
>> Am 27.08.2015 um 13:39 schrieb Sergey Zinov:
>>
>> Hi,
>>
>> Try to set ZMQ_SNDHWM to 1. By the way which transport are you using?
>>
>> On 27.08.2015 11:52, Bachmair Florian - flexSolution GmbH wrote:
>>
>> I tried it, but it does not work!
>>
>> Don't know If I get that right, but even If I set ZMQ_RECONNECT_IV to
>> "-1" my PUB and SUB Sockets are reconnecting to each other after I replug
>> the cable
>>
>> Am 27.08.2015 um 10:59 schrieb Doron Somech:
>>
>> I'm not sure, but try to set  ZMQ_IMMEDIATE option.
>> On Aug 27, 2015 11:38 AM, "Bachmair Florian - flexSolution GmbH" <
>> florian.bachmair at flexsolution.eu> wrote:
>>
>>> Hello!
>>>
>>> Is there a opportunity to tell the publisher not to resend messages?
>>>
>>> I have two stations A and B
>>>
>>> A publishes all the time
>>> B receives it
>>>
>>> A-PUB 10
>>> B-SUB 10
>>> A-PUB 20
>>> B-SUB 20
>>> A-PUB 30
>>> B-SUB 30
>>> A-PUB 40
>>> B-SUB 40
>>> ---unplug cable
>>> A-PUB 50
>>> A-PUB 60
>>> A-PUB 70
>>> ---plug cable again
>>> B-SUB 50
>>> B-SUB 60
>>> B-SUB 70
>>> ....
>>>
>>>
>>> B does some routines after it gets those values. But I'm not interested
>>> in 50 and 60 any more, I just want the 70 after reconnection.
>>> I do Heartbeating so I detect connection lost on my own and I can
>>> request the last value as well. So is this possible to disable the
>>> resend mechanism?
>>>
>>> Thx
>>> Florian
>>> _______________________________________________
>>> zeromq-dev mailing list
>>> zeromq-dev at lists.zeromq.org
>>> http://lists.zeromq.org/mailman/listinfo/zeromq-dev
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>>
>>
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>> --
>> Sergey Zinov
>>
>> Wissenschaftlicher Mitarbeiter
>> Fachbereich Elektrotechnik, Maschinenbau und Wirtschaftsingenieurwesen
>> Hochschule Anhalt
>> /
>> Research Assistant
>> Department of Electrical, Mechanical and Industrial Engineering
>> Anhalt University of Applied Sciences
>>
>> Phone: +4915738145172
>>
>>
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>> --
>> Sergey Zinov
>>
>> Wissenschaftlicher Mitarbeiter
>> Fachbereich Elektrotechnik, Maschinenbau und Wirtschaftsingenieurwesen
>> Hochschule Anhalt
>> /
>> Research Assistant
>> Department of Electrical, Mechanical and Industrial Engineering
>> Anhalt University of Applied Sciences
>>
>> Phone: +4915738145172
>>
>>
>>
>> _______________________________________________
>> zeromq-dev mailing listzeromq-dev at lists.zeromq.orghttp://lists.zeromq.org/mailman/listinfo/zeromq-dev
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