E-VAN - Sagas

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andreasohlund

My e-van presentation on sagas and how they are supported in NServiceBus

Tecnología Diseño

What’s this “Saga” thing
that everyone is talking
about?
@andreasohlund
http://andreasohlund.net

What is a long running
process?

“A long running process is a process whose
execution lifetime exceeds the time to
process a single external event or message”
- Udi Dahan

Long running process

Step Step
Start
Start End
Step Step Step

The problem
• Holding locks for the duration of a long
running transaction are more likely
• To be deadlocked
• To experience infrastructure failures

Long Lived Transactions

Business Transaction

Step Step
Start End
Step Step Step

Long Lived Transactions

Business Transaction

Step
ACID ACID
Step
Start End
ACID
Step ACID
Step ACID
Step

The anatomy of a step

Step

Get current state

Store

Sagas vs Aggregate roots

Event Command
Saga

Command Event
AR

Sagas and bounded
contexts
Ext
ern
al E
ven
t
Saga

Command
Event

AR

Bounded context

The birth of a saga
Create
Saga
Saga message
instance
Bus

The birth of a saga
Create

Dispatch Saga
Saga message
instance
Bus

The birth of a saga
Create

Dispatch Saga
Saga message
instance
Bus
Send

The birth of a saga
Create

Dispatch Saga
Saga message
instance
Bus
Send
Saga
Save
Persister

The birth of a saga
Create

Dispatch Saga
Saga message
instance
Bus
Send
Saga
Save
Persister

Store
DB

Existing sagas
Get

Message
Saga
Bus Persister

Load/Store
DB

Existing sagas
Get

Message State
Saga Saga
Bus instance Persister

Load/Store
DB

Existing sagas
Get

Message State
Dispatch
Saga Saga
Bus instance Persister

Load/Store
DB

Existing sagas
Get

Message State
Dispatch
Saga Saga
Bus instance Persister
Send

Load/Store
DB

Existing sagas
Get

Message State
Dispatch
Saga Saga
Bus instance Persister
Send

Save

Load/Store
DB

State
• Remember what steps have been executed
• Gets persisted between each step
• Temporary storage of data
• Serialize access to the same saga instance
• Unique index
• Locking

Time

• Long running transactions
• Time is a business requirement
• Needs to be durable and managed externally

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E-VAN - Sagas

1. What’s this “Saga” thing that everyone is talking about? @andreasohlund http://andreasohlund.net

2. What is a long running process? “A long running process is a process whose execution lifetime exceeds the time to process a single external event or message” - Udi Dahan

3. Long running process Step Step Start Start End Step Step Step

4. Long running process Step Step Start Start End Step Step Step

5. The problem • Holding locks for the duration of a long running transaction are more likely • To be deadlocked • To experience infrastructure failures

6. Long Lived Transactions Business Transaction Step Step Start End Step Step Step

7. Long Lived Transactions Business Transaction Step ACID ACID Step Start End ACID Step ACID Step ACID Step

8. The anatomy of a step Step

9. The anatomy of a step Step

10. The anatomy of a step Step Get current state Store

11. The anatomy of a step Step Get current state Store

12. Sagas vs Aggregate roots Event Command Saga Command Event AR

13. Sagas and bounded contexts Ext ern al E ven t Saga Command Event AR Bounded context

14. The birth of a saga Saga message Bus

15. The birth of a saga Create Saga Saga message instance Bus

16. The birth of a saga Create Dispatch Saga Saga message instance Bus

17. The birth of a saga Create Dispatch Saga Saga message instance Bus Send

18. The birth of a saga Create Dispatch Saga Saga message instance Bus Send Saga Save Persister

19. The birth of a saga Create Dispatch Saga Saga message instance Bus Send Saga Save Persister Store DB

20. Existing sagas Message Bus

21. Existing sagas Get Message Saga Bus Persister Load/Store DB

22. Existing sagas Get Message State Saga Saga Bus instance Persister Load/Store DB

23. Existing sagas Get Message State Dispatch Saga Saga Bus instance Persister Load/Store DB

24. Existing sagas Get Message State Dispatch Saga Saga Bus instance Persister Send Load/Store DB

25. Existing sagas Get Message State Dispatch Saga Saga Bus instance Persister Send Save Load/Store DB

26. State • Remember what steps have been executed • Gets persisted between each step • Temporary storage of data • Serialize access to the same saga instance • Unique index • Locking

27. Time • Long running transactions • Time is a business requirement • Needs to be durable and managed externally

Notas del editor

LLT - Long lived transactions - Hector Garcia-Molina 87 Top level is a business transaction Does not comply to ACID Requires compensating actionsSecond level is acid compliantAnalyze the business to find the boundaries Add messages -> in order to make each step as short as possible + forward movement only
Developers tends to do the same mistakes today
Top level is a business transaction Does not comply to ACID Requires compensating actionsSecond level is acid compliantAnalyze the business to find the boundaries Add messages -> in order to make each step as short as possible + forward movement only
One way messaging only to keep transaction as short as possible More scalable and robust http://www.udidahan.com/2008/06/23/sagas-solve-stupid-transaction-timeouts/ Can execute “steps” in parallelSaga instances are not run in parallelUse locks in DB to ensure that
Not a hard rule Sagas are useful for other non DDD related things
Sagas operate within a BC Can react to events from other BC’s
Saga message handlers have state

E-VAN - Sagas

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E-VAN - Sagas

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