I want to implement data distribution application using zeromq or nanomsg or aeron.net or OpenDDS or OpenMAMA, I am little confused , which one is suitable as my requirement is to support 500 to 1000 users and each user can subscribe for atleast 100 topics
this can be handled by using pub/sub pattern or I have to use UDP multicast ?
Also I need to deploy this application on Amazon EC2
"Can ( this ) be handled by using pub/sub pattern or ( do ) I have to use UDP multicast?"
The PUB/SUB Scalable Formal Communication Pattern tells how the agents behave each to the other.
Whereas,
the UDP multicast tells what technical transport class could be preferred to be used, i.e. either of { pgm:// | epgm:// } from those of all the technically available ones
{ inproc:// | ipc:// | tcp:// | pgm:// | epgm:// | vmci:// }
Finalle,
the PUB/SUB can work over { pgm:// | epgm:// }, so the "or"-choice constructor is principally not an adequate one.
Neither ZeroMQ nor nanomsg ( as of implementations available in 2018-Q1 ) will have issues with the PUB/SUB mechanics over ~ 1000 users x 100+ topics.
For details, one may read wonderfull Martin Sustrik's technical details how and why topic-filters work in either of these platforms. He, being a father of both these signalling / messaging systems, one could hardly ask a better or more insightfull person on this subject and its limits.
Having expressed your prior exposure to FinTech / FIX-Protocol / Trading platforms, you ought have experience enough to decide further on principal issues.
Easy. Go get it done. If in problems, re-read platform documentation and ask the service provider first.