Abstract
Real-time information dissemination is of increasing im-
portance to our society. Existing work mainly focuses on
delivering information from sources to sinks in a timely
manner based on established subscriptions, with the as-
sumption that those subscriptions are persistent. However,
the bottleneck of many real-time information dissemination
systems is actually the matching process to continuously
reevaluate such subscriptions between numerous sources
and numerous sinks, in response to dynamically varying in-
formation attributes at runtime. In this paper, we propose
a feedback controller to adaptively meet the response time
constraints on metadata matching in an example informa-
tion dissemination system. Our controller features a rigor-
ous design based on well-established feedback control the-
ory for guaranteed control accuracy and system stability.
Empirical results on a physical test-bed demonstrate that
our controller outperforms both an open-loop solution and
a typical heuristic solution, by having more accurate con-
trol and better system quality of service.
