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
<[email protected] <mailto:[email protected]>> wrote:
On 18 January 2013 15:14, Nishant Mittal <[email protected]
<mailto:[email protected]>> 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
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*Nishant Mittal*
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