15,000 GPS pings a second. Do not put that in a queue.
Partitions, offsets and the reason four teams can read the same event.
What you'll learn
- Why a queue cannot hand the same event to four teams
- How a partition key keeps one driver’s pings in order
- How consumer groups and offsets let a slow reader catch up
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Understand it one step at a time
The short runs these in order in about 32 seconds. Here they are written out — pick any step to jump the short straight to it.
60,000 drivers. Every 4 seconds
Every car reports GPS position every 4 seconds. Nobody asked for a reply, and no record needs a lock to write it.
Frequently asked questions
- Why doesn't a queue work for 60,000 drivers sending GPS pings?
- A queue hands each message to exactly one consumer and removes it — if four different teams (routing, billing, safety, analytics) all need the same ping, a queue can't give it to all of them. A partitioned event stream can, because reading doesn't remove the event.
- How does Event Hubs keep one driver's pings in order?
- By partition key — pings from the same driver land in the same partition, and a partition preserves the order of what was written to it, so one consumer reading that partition sees that driver's pings in order.
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