[zeromq-dev] Design Question

[Nishant Mittal]

i see.. that might explain why DLR is blocking.. so do you think if i set
the SND buffer to 0 on the dealer.. this will work? effectively giving me a
load balanced broker?


On Fri, Jan 18, 2013 at 11:10 AM, Stuart Brandt <stu at compuserve.com> wrote:

>  Your DLR has a send_hwm too, so it's going fair queue against its
> outbound queues (which might not be full despite receiver not accepting
> more).  The mentioned load-balancing-message-broker or one of the reliable
> request-response patterns in section 4 will probably serve you better than
> trying to control routing by adjusting HWM.
>
>
> On 1/18/13 10:58 AM, Nishant Mittal wrote:
>
> aah, i remember that now.. i'll look into it again.
> my hope was DLR would "try" to fair queue but if the worker was not
> accepting any more msgs.. DLR would try the other worker.. but its not
> doing that.
>
>  thanks
>
> On Fri, Jan 18, 2013 at 10:49 AM, Andy Ballingall TF <
> ballingall at thefoundry.co.uk> wrote:
>
>>
>>  On 18 January 2013 15:14, Nishant Mittal <nmittal at rblt.com> wrote:
>>
>>> I have 3 workers (REP) connected to a DLR socket. each worker takes a
>>> msg, processes and responds... however, as the DLR socket fair-queues..
>>> requests are sent like this...
>>> 1st -> 1st worker
>>>  2nd -> 2nd worker
>>>  3rd -> 3rd worker
>>> 4th -> 1st worker
>>>
>>>  problem is if the 1st worker is still busy with the 1st request the
>>> 4th request waits... even if the 2nd and 3rd workers are free. I am
>>> "guessing" its because of the receive buffer on the REP socket..
>>>
>>>  is it possible to fix this by setting the ZMQ_RCVHWM to 0?
>>>
>>>
>>  I'm not sure if it will help your use case, but have you read through
>> the load balancing example in the guide?
>>
>>  http://zguide.zeromq.org/page:all#A-Load-Balancing-Message-Broker
>>
>>  Workers are only given work to do if they are free, so you never get
>> the problem of some workers having a queue of things to process while
>> others are idle.
>>
>>  Andy
>>
>>
>>
>>
>>
>>  --
>> Andy Ballingall
>> Senior Software Engineer
>>
>>  The Foundry
>> 6th Floor, The Communications Building,
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>
>
>  --
> *Nishant Mittal*
>  Director, Product Development
>  *Rosenblatt Securities Inc*.
> 20 Broad Street
> New York, NY 10005
>
>  Direct: 212-607-3159
> Mobile: 646-504-2629
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-- 
*Nishant Mittal*
Director, Product Development
*Rosenblatt Securities Inc*.
20 Broad Street
New York, NY 10005

Direct: 212-607-3159
Mobile: 646-504-2629
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