Big Dating at eHarmony

•

5 likes•6,479 views

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.

Technology

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!

legacy compatibility match processor (CMP)

legacy compatibility match processor V.2 (CMP)

challenges with existing v2. design (contd.)

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

linkedin.com/in/thodnguyen

We’re
Hiring
@jobs.eharmony.com

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Big Dating at eHarmony

1. Thod Nguyen Chief Technology Oﬃcer Big Dating at eHarmony

2. social impact

3. 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

4. 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

5. today !   Compa9bility Matching System !   The Old !   The New !   Why MongoDB !   What’s Next

6. compatibility matching system® Compa0bility Matching System® Match Distribu0on 3! Compa0bility Matching 1! Aﬃnity Matching 2!

7. Compa0bility Matching System® Aﬃnity Matching Match Distribu0on 2! 3! compatibility matching system (cont’d) Compa0bility Matching 1!

8. traditional search

9. eharmony matching

10. compatibility models

11. compatibility matching process

12. legacy compatibility match processor (CMP)

13. legacy compatibility match processor V.2 (CMP)

14. challenges with existing v2. design

15. challenges with existing v2. design (contd.)

16. challenges with existing v2. design (contd.)

17. challenges with existing v2. design (contd.)

18. challenges with existing v2. design (contd.)

19. new data store requirements

20. why Mongodb?

21. tradeoffs !   No schema = larger footprint !   Aggrega9on queries are diﬀerent !   Ini9al conﬁgura9on can be long, manual process

22. 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

23. 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

24. technology stack

25. linkedin.com/in/thodnguyen We’re Hiring @jobs.eharmony.com

Big Dating at eHarmony

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