Backpressure.

also: back-pressure · back pressure · flow control

What happens when a downstream can't keep up with an upstream, and the signals or mechanisms that slow the producer to match.

the two-minute refresher

Highway on-ramp: 100 cars/min arrive, 60/min merge, and the queue grows forever.
Detect it: rising consumer lag, queue depth, latency and saturation.
Respond: shed load, rate-limit producers, scale consumers or spill to a buffer.
Ignoring it ends in memory exhaustion or a cascading failure.

also: back-pressure · back pressure · flow control

What happens when a downstream can't keep up with an upstream, and the signals or mechanisms that slow the producer to match.

Highway on-ramp: 100 cars/min arrive, 60/min merge, and the queue grows forever.
Detect it: rising consumer lag, queue depth, latency and saturation.
Respond: shed load, rate-limit producers, scale consumers or spill to a buffer.
Ignoring it ends in memory exhaustion or a cascading failure.