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Event-driven Systems

Use of P2P/DHT substrate

Broker IP addresses hashed into 128-bit space

Event topics hashed into 128-bit space. Topic is managed by broker with nearest value > topic hash

Brokers keep tables of nearest neighbours (for different common prefixes) in 128-bit space – see next slide

Event messages from pubs and subs routed to broker nearest to event topic’s hash value in O(logN) hops – called the “rendezvous node” for that topic

Paths to same destination converge quickly

Paths shared to nearby destinations – late fanout

Resilient to join/leave/failure of nodes

Scales to millions of nodes

Event-driven Systems

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