Saga pattern

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Alexander Prygun (HYS Enterprise)

Saga Pattern
By Alexandr Prygun
Saga Pattern
Play
hys-enterprise.com

HYS Enterprise is a Dutch software
development company with more than
200 talented engineers from all over
the world hys-enterprise.com
UkraineNetherlands

My experience
5+ years experience .NET Developer / Team Lead in HYS Enterprise
Saga pattern

Monolith App
Saga Pattern
API Application Database
One call One transactionIncoming call

Saga Patterm
API
Gateway
Application 1 Database 1
Application 2 Database 2
Application 3 Database 3
Incoming call
SOA/Microservices App

Saga Pattern
2PC: Prepare Phase
API
Gateway
Application 1 Database 1
Application 2 Database 2
Application 3 Database 3
Incoming call
Propose
Vote
Propose
Vote
Propose
Vote

Saga Pattern
2PC: Commit Phase
API
Gateway
Application 1 Database 1
Application 2 Database 2
Application 3 Database 3
Incoming call
Commit/Abort
Done
Commit/Abort
Done
Commit/Abort
Done

Saga Pattern
2PC: Disadvantages
- Data stays locked until commit or abort command
- There is no mechanism to rollback other transactions in case one service fails
- Others have to wait until the slowest resource finish its confirmation.
- Bad scaling

Saga Pattern
Sagas History
Long Live Transactions
Hector Garcia-Molina, Kenneth Salem,
Princeton University, 1987

Saga Pattern
What is Saga?
- Saga is long-lived transaction
- Saga is collection of sub-transactions

Saga Pattern
Saga orchestrator
Hotel
Booking
Service
Database 1
Rent Car
Service Database 2
Flight Tickets
Service Database 3
Book Trip Start saga
Start book hotel
End book hotel
Start book car
End book car
Start book tickets
End book tickets
End saga

Saga Pattern
Saga choreography
Hotel
Booking
Service
Database 1
Rent Car
Service Database 2
Flight Tickets
Service Database 3
Book Trip Start saga
Hotel is booked
Car is booked
End saga
Tickets are booked

Saga Pattern
Unsuccessful Saga
Start saga
1. Start book hotel
2. End book hotel
3. Start book car
4. End book car
5. Start book flights
6. Flights booking fail
Abort saga
7. Start cancel car
8. End cancel car
9. Start cancel hotel
10. End cancel hotel
End saga
Commit steps
Rollback steps

Saga Pattern
Saga pros and cons
Main advantage is that it helps maintain data consistency across
multiple services without tight coupling.
Main disadvantage is the complexity from a programming point
of view. Compensating transaction should be designed.

Saga Pattern
Saga tips
- A unique distributed transaction ID should be created for each saga and it
should be present in each related command or event
- Saga commands should be idempotent
- All components should implement compensate commands handlers
- Compensate commands should be idempotent as well
- Avoid synchronous operations

Thank you
For your attention!
Any Questions?
Event Name

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Wild Async .NET world: AID Kit for boy-scouts

Contract testing. Getting started with Pact IO.

Contract testing. Getting started with Pact IO.

Contract testing. Getting started with Pact IO.

Testing strategies in a microservices architecture. Independence vs integration

Testing strategies in a microservices architecture. Independence vs integration

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“Tips&Tricks&Antitricks with .Net Core backend in GameDev”

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"Dealing with legacy code"

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Evgeniy Burak (HYS Enterprise): “Spring Data REST or intellectual job VS manual”

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Cheap and Cheerful: Useful Tools for Fast Development of Ready-Made Solutions

Cheap and Cheerful: Useful Tools for Fast Development of Ready-Made Solutions

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Online Food Ordering System is proposed for simplifies the food ordering process. ThisSystem shows an user interface and update the menu with all available options so that it eases thecustomer work. Customer can choose more than one item to make an order and can view Orderdetails before logging off. The order confirmation is sent to the customer. The order is placed inthe queue and updated in the Database and returned in real time. This system assists the staff togo through the orders in real time and process it efficiently. Online food order system is mainlydesigned primarily function for use in the food delivery industry. This system will allowhotels and restaurants to increase online food ordering such type of business. The customerscan be selected food menu items just few minutes. In the modern food industries allows toquickly and easily delivery on customer place. Restaurant employees then use these ordersthrough an easy to delivery on customer place easy find out navigate graphical interface forefficient processing .

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Saga pattern

1. Saga Pattern By Alexandr Prygun Saga Pattern Play hys-enterprise.com

2. HYS Enterprise is a Dutch software development company with more than 200 talented engineers from all over the world hys-enterprise.com UkraineNetherlands

3. My experience 5+ years experience .NET Developer / Team Lead in HYS Enterprise Saga pattern

4. Monolith App Saga Pattern API Application Database One call One transactionIncoming call

5. Saga Patterm API Gateway Application 1 Database 1 Application 2 Database 2 Application 3 Database 3 Incoming call SOA/Microservices App

6. Saga Pattern 2PC: Prepare Phase API Gateway Application 1 Database 1 Application 2 Database 2 Application 3 Database 3 Incoming call Propose Vote Propose Vote Propose Vote

7. Saga Pattern 2PC: Commit Phase API Gateway Application 1 Database 1 Application 2 Database 2 Application 3 Database 3 Incoming call Commit/Abort Done Commit/Abort Done Commit/Abort Done

8. Saga Pattern 2PC: Disadvantages - Data stays locked until commit or abort command - There is no mechanism to rollback other transactions in case one service fails - Others have to wait until the slowest resource finish its confirmation. - Bad scaling

9. Saga Pattern Sagas History Long Live Transactions Hector Garcia-Molina, Kenneth Salem, Princeton University, 1987

10. Saga Pattern What is Saga? - Saga is long-lived transaction - Saga is collection of sub-transactions

11. Saga Pattern Saga orchestrator Hotel Booking Service Database 1 Rent Car Service Database 2 Flight Tickets Service Database 3 Book Trip Start saga Start book hotel End book hotel Start book car End book car Start book tickets End book tickets End saga

12. Saga Pattern Saga choreography Hotel Booking Service Database 1 Rent Car Service Database 2 Flight Tickets Service Database 3 Book Trip Start saga Hotel is booked Car is booked End saga Tickets are booked

13. Saga Pattern Unsuccessful Saga Start saga 1. Start book hotel 2. End book hotel 3. Start book car 4. End book car 5. Start book flights 6. Flights booking fail Abort saga 7. Start cancel car 8. End cancel car 9. Start cancel hotel 10. End cancel hotel End saga Commit steps Rollback steps

14. Saga Pattern Saga pros and cons Main advantage is that it helps maintain data consistency across multiple services without tight coupling. Main disadvantage is the complexity from a programming point of view. Compensating transaction should be designed.

15. Saga Pattern Saga tips - A unique distributed transaction ID should be created for each saga and it should be present in each related command or event - Saga commands should be idempotent - All components should implement compensate commands handlers - Compensate commands should be idempotent as well - Avoid synchronous operations

16. Thank you For your attention! Any Questions? Event Name