[zeromq-dev] Design Question

[Stuart Brandt]

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 <mailto:ballingall at thefoundry.co.uk>> wrote:
>
>
>     On 18 January 2013 15:14, Nishant Mittal <nmittal at rblt.com
>     <mailto: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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>
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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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