Big Data Day LA 2015 - Event Sourcing: The Best Ubiquitous Pattern You've Never Heard Of by Bryan Reneiro of MongoDB

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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.

Technology

Event
Sourcing

The
best
ubiquitous
pa5ern
you’ve
never
heard
of.

{
Name:
‘Bryan
Reinero’,

Title:
‘Developer
Advocate’,

Twi5er:
‘@blimpyacht’,

Email:
‘bryan@mongdb.com’
}

Let’s
Build
a
Banking
App

h5p://media.liveaucLongroup.net/i/5900/8757795_1.jpg?v=8CC56CE3AAC0100

Let’s
Build
a
Banking
App

User: A
Balance: 427
User: B
Balance: 550

Let’s
Build
a
Banking
App

User: A
Balance: 427
User: B
Balance: 550
+5
-‐5

Event
Sourcing

h5p://www.avanscoperta.it/en/training/cqrs-‐event-‐sourcing-‐and-‐applying-‐domain-‐driven-‐design/

Event
Sourcing

h5ps://media.licdn.com/media/p/5/005/09f/2d8/3c9f5a5.jpg

Event
Sourcing

Command
Query
Responsibility
SegregaLon

(CQRS)

+4

-‐2

+5

+7

-‐4

+9

-‐3

-‐6

+2

+1

+1

-‐5
State
at
t(12)
=
9

Event
Sourcing

+4

-‐2

+5

+7

-‐4

+9

-‐3

-‐6

+2

+1

+1

-‐5

State
at
t(5)
=
10

Event
Sourcing

+4

-‐2

+5

+7

-‐4

+9

-‐3

-‐6

+2

+1

+1

-‐5

State
at
t(9)=
12

Event
Sourcing

+4

-‐2

+5

+7

-‐4

+9

-‐3

-‐6

+2

+1

+1

-‐5

Event
Sourcing

+5

-‐4

+5

+4

-‐2

+5

+7

-‐4

+9

-‐3

-‐6

+2

+1

+1

-‐5

Event
Sourcing

+4

-‐2

+5

+7

-‐4

+9

-‐3

-‐6

+2

+1

+1

-‐5

State
at
t(4)
=
14

Event
Sourcing

State
at
t(8)
=
10

State
at
t(12)
=
9

Accounts
Payable
Accounts
Receivable

Journal

Ledger

Command
Query

Responsibility

SegregaLon

CRUD
vs.
CQRS

U.I.

WRITE

READ

Primary

READ

CRUD
vs.
CQRS

U.I.

2ndary

WRITE

READ

2ndary

Primary

READ

Thanks!

{
Name:
‘Bryan
Reinero’,

Title:
‘Developer
Advocate’,

Twi5er:
‘@blimpyacht’,

Email:
‘bryan@mongdb.com’
}

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Event Sourcing is powerful way to think about domain objects and transaction processing. Rather than persisting current state, event sourcing instead writes an immutable log of deltas to the db. Application state is derived, at any point in the past, simply by replaying the event history. 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, used in databases, IoT and finance.

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Big Data Day LA 2015 - Event Sourcing: The Best Ubiquitous Pattern You've Never Heard Of by Bryan Reneiro of MongoDB

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