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Zillow: Optimistic Concurrency Using Write-time Timestamps

Dan Podhola, Zillow

12 minutesJanuary 9, 2021

Consuming messages from multiple sources in a scalable service sharing the same ScyllaDB cluster can be problematic, especially when those sources provide data from two queues each and cannot deliver guaranteed in-order messages. At Zillow, we provide the ScyllaDB write timestamp and employ a couple other tricks at Zillow to provide correct and consistent data to our consuming services and avoid doing transactions. Additionally, the Zillow data model is a simple compound key that contains a large binary Avro document.

 

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