Airbnb Cuts Recommendation Staleness to Seconds

Airbnb updated its open source Chronon platform with Push Mode and Near Real Time Model Transform to reduce recommendation embedding staleness from nearly two days to less than a minute. Online A/B testing showed a 1.67% improvement in offline NDCG and an approximately 0.33% increase in uncancelled bookings, with typical updates arriving within 10 to 30 seconds.