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eHarmony uses MongoDB to make it easier for couples to find each other. At the forefront of big data and machine learning, eHarmony’s matching system uses a flow algorithm to process a billion potential matches per day. The Compatibility Matching System® uses bi-directional, user-defined criteria to match members based on a comprehensive set of traits and preferences. The system was originally built on a relational database, but with over 51MM+ users, it took more than 2 weeks for the matching algorithm to run. By switching to MongoDB, eHarmony reduced the time to match by 95% to under 12 hours. Learn about eHarmony's matching system, its technology evaluation process, and how it has used MongoDB to make the happiest couples in the world.
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Thod Nguyen Chief Technology Officer
Big Dating at eHarmony
social impact
big dating at scale
! 3B+ poten9al matches daily ~ 25+ TB of data
! 60M+ mul9-‐aDribute queries daily looking across 250+ aDributes
! 212M+ photos ~ 15+ TB of data
! 4B+ rela9onship ques9onnaires ~ 25+ TB of data
the big win for product
Decreased the processing 0me to match by 95%, from 2+ weeks to 12 hours
on 3B+ poten0al matches/day ! 30% increase in 2-‐way communica9ons
! 50% increase in paid subs
! 60% increase in unique visitors
today
! Compa9bility Matching System
! The Old ! The New ! Why MongoDB
! What’s Next
compatibility matching system ®
Compa0bility Matching System®
Match Distribu0on
3!
Compa0bility Matching
1!
Affinity Matching
2!
Compa0bility Matching System®
Affinity Matching
Match Distribu0on
2! 3!
compatibility matching system (cont’d)
Compa0bility Matching
1!
traditional search
eharmony matching
compatibility models
compatibility matching process
legacy compatibility match processor (CMP)
legacy compatibility match processor V.2 (CMP)
challenges with existing v2. design
challenges with existing v2. design (contd.)
challenges with existing v2. design (contd.)
challenges with existing v2. design (contd.)
challenges with existing v2. design (contd.)
new data store requirements
why Mongodb?
tradeoffs
! No schema = larger footprint
! Aggrega9on queries are different
! Ini9al configura9on can be long, manual process
lessons learned
! Turn on the Firehose
! Unleash the Chaos Monkey
! Engage MongoDB, Inc. early – dev to produc9on
! Try to isolate your queries to a shard
! Run in shadow mode
what’s next
New matching use cases: ! Globaliza9on and Localiza9on of eH site ! Careers by eHarmony ! Internet of Things “Compa9ble” New use cases within eHarmony: ! Real-‐9me geo loca9on based matching service ! Careers
technology stack
linkedin.com/in/thodnguyen We’re Hiring @jobs.eharmony.com
