Goruco Videos

Bryan Reinero

Event sourcing


Event Sourcing is powerful way to think about domain objects and transaction processing. Rather than persisting an object in it’s current state, event sourcing instead writes an immutable log of deltas (domain events) to the database. from this set of events, an object’s state is derived, at any point in the past, simply by replaying the event history sequentially.

Event sourcing is a deceptively radical idea which challenges our contemporary notions about transaction processing, while also being a mature pattern with a long history. This talk will take a look at how event processing is used across a spectrum of use cases, including database engines and financial systems, to Google Docs hacks.


Bryan Reinero is a Senior Consulting Engineer at MongoDB, helping users optimize MongoDB for scale and performance. Prior to his work as a Consulting Engineer, Bryan contributor to the Java Driver for MongoDB. Earlier Bryan was Software Engineering Manager at Valueclick, leading the design and development of large scale online marketing applications for advertising, retargeting, real-time bidding and campaign optimization. Earlier still, Bryan specialized in software for embedded systems at Ricoh Corporation. Bryan also developed data analysis, signal processing and aeroacoustic research software at the Experimental Physics Branch of Ames Research Center.