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The Benefits of Orchestration
in Distributed Systems
@NiallDeehan
Who I am?
Niall Deehan
Distributed systems
Challenges of
asynchronicity
Distributed
Transactions
Communication
is complex
Do A
Do B
All or
nothing
+
try {
tx.begin();
doA();
doB();
tx.commit();
} catch (Exception e) {
tx.rollback();
}
@Transactional
public void createCustomer(Customer cust) {
// ...
}
Or simply:
Once upon a time:
A
C
I
D
Atomicity
Consistency
Isolation
Durability
Distributed systems
Distributed systems
Some
Service
Some
Service
Some
Service
Some
Service
Some
Service
Some
Service
Some
Service
Failure will happen.
Accept it!
But keep it local!
Be resilient.
Communication
is complex
Let‘s start with a simple example
Credit
Card
Payment
REST
Live hacking
https://github.com/flowing/flowing-retail/blob/master/payment-
rest/src/main/java/io/flowing/retail/payment/port/resthacks/PaymentRestHacksControllerV1.java
It‘s a blocking request.
It doesn‘t scale
Starbucks does not use two phase commit
Gregor Hohpe https://www.enterpriseintegrationpatterns.com/ramblings/18_starbucks.html
Photo by John Ingle
That means
Do A
Do B
Temporarily
inconsistent
Eventually
consistent
again
t
Consistent
Local
ACID
Local
ACID
1 (micro-)service
1 aggregate
1 program
1 resource
Violates „I“
of ACID
Youmightknowthisfrom:
Do A
Do B
Temporarily
inconsistent
Eventually
consistent
again
t
Consistent
Photo by Gerhard51, available under Creative Commons CC0 1.0 license.
It is impossible to
differentiate certain
failure scenarios:
Independant of
communication style!
Service
Provider
Client
Network problems
Credit
Card
Payment
charge
Let‘s start with a simple example
Credit
Card
Payment
REST
Circuit
Breaker
Photo by CITYEDV, available under Creative Commons CC0 1.0 license.
Live hacking
https://github.com/flowing/flowing-retail/blob/master/payment-
rest/src/main/java/io/flowing/retail/payment/port/resthacks/PaymentRestHacksControllerV2.java
Fail fast
is important
Fail fast
is important
but not enough!
Berlin, Germany
bernd.ruecker@camunda.com
@berndruecker
Bernd Ruecker
Co-founder and
Developer Advocate of
Camunda
Photo by Tookapic, available under Creative Commons CC0 1.0 license.
Translation :
„There was an error
while sending your
boarding pass“
Check-in
Web-UI
Bernd
Current situation
Check-in
Barcode
Generator
Web-UI
Output
Mgmt
Current situation
Bernd
Check-in
Barcode
Generator
Web-UI
Output
Mgmt
Current situation
Bernd
Check-in
Barcode
Generator
Web-UI
Output
Mgmt
Current situation
Circuit
breaker
Bernd
Check-in
Barcode
Generator
Web-UI
Output
Mgmt
Current situation – the bad part
Bernd
Check-in
Barcode
Generator
Web-UI
Output
Mgmt
Current situation – the bad part
Bernd
Check-in
Barcode
Generator
Web-UI
Output
Mgmt
Current situation – the bad part
Stateful
Retry
Bernd
Translation:
It‘s your problem
now.
We are having some technical
difficulties and cannot present you
your boarding pass right away.
But we do actively retry ourselves, so
lean back, relax and we will send it
on time.
Check-in
Barcode
Generator
Web-UI
Output
Mgmt
Possible situation – much better!
Bernd
Check-in
Barcode
Generator
Web-UI
Output
Mgmt
Possible situation – much better!
Stateful
Retry
Bernd
Check-in
Barcode
Generator
Web-UI
Output
Mgmt
Stateful
Retry
Possible situation – much better!
The failure
never leaves
this scope!
Bernd
Persist thing
(Entity, Document, Actor, …)
State machine or
workflow engine
Typical
concerns
DIY = effort,
accidental
complexity
Complex, proprietary,
heavyweight, slow,
don‘t scale,
developer adverse
Scheduling, Versioning,
operating, visibility,
scalability, …
Handling
State
Warning:
Contains Opinion
Workflow engines,
state machines
It is
relevant
in modern
architectures
What about open source…?
CADENCE
Silicon valley
has recognized
Workflow engines,
state machines
What about purpose built and open source…
CADENCE
Workflow engines,
state machines
CADENCE
also at scale
Workflow engines,
state machines
CADENCE
for todays demo
Workflow engines,
state machines
Live hacking
https://github.com/flowing/flowing-retail/blob/master/payment-
rest/src/main/java/io/flowing/retail/payment/port/resthacks/PaymentRestHacksControllerV3.java
Challenges of
asynchronicity
Payment
Now you have a state machine!
Credit
Card
REST
has to implement
Retry
has to implement
Idempotency
Client Service Provider
We are processing your payment.
Do not leave this page.
And for god sake – do not reload!
It is a business
problem
anyway!
We are processing your payment.
Do not leave this page.
And for god sake – do not reload!
It is a business
problem
anyway!
We are currently processing your request.
Don‘t worry, it will happen safely –
even if you loose connection.
Feel free to reload this page any time!
Distributed systems introduce complexity you have to tackle!
Credit
Card
Payment
REST
Distributed
systems
It is impossible to
differentiate certain
failure scenarios.
Independant of
communication style!
Service
Provider
Client
Distributed systems introduce complexity you have to tackle!
Credit
Card
Payment
REST
Distributed systems introduce complexity you have to tackle!
Credit
Card
Payment
REST
Check-in
Barcode
Generator
Web-UI
Bernd
Output
Mgmt
Workflows live within
service boundaries
„The customer wants a synchronous response“
Check-in
Barcode
Generator
Web-UI
Bernd
Output
Mgmt
„Eh – no!“
generateBoardingPass
HTTP 200 OK
HTTP 202 ACCEPTED
Check-in
A synchronous response is possible in the
happy case, otherwise it is switched to
asynchronous processing.
Live hacking
https://github.com/flowing/flowing-retail/blob/master/payment-
rest/src/main/java/io/flowing/retail/payment/port/resthacks/PaymentRestHacksControllerV4.java
Challenges of
asynchronicity
Check-in
Barcode
Generator
Web-UI
Bernd
Output
Mgmt
Asynchronous communication
You need to
monitor
timeouts
Check-in
Barcode
Generator
Web-UI
Bernd
Output
Mgmt
Remember…
The failure
never leaves
this scope!
Workflow…
Workflow…
BPMN
Business Process
Model and Notation
ISO Standard
BPMN
Executable
and mature
Easy to
understand*
Widespread
*(for Biz and Dev)
Graphical models?
Clemens Vasters
Architect at Microsoft
http://vasters.com/archive/Sagas.html
Clemens Vasters
Architect at Microsoft
http://vasters.com/archive/Sagas.html
Clemens Vasters
Architect at Microsoft
http://vasters.com/archive/Sagas.html
Living documentation for long-running behaviour
Visual HTML reports for test cases
Proper
Operations
Visibility + Context
Compare to e.g. Step Functions
Imagine more complex stuff
has to implement
Timeout, Retry
has to implement
Idempotency
Client Service Provider
Manigfold architecture options
https://blog.bernd-ruecker.com/architecture-options-to-run-a-workflow-engine-6c2419902d91
Manigfold architecture options
https://blog.bernd-ruecker.com/architecture-options-to-run-a-workflow-engine-6c2419902d91
Avoids thundering herds
Photo by Gopal Vijayaraghavan, available under Creative Commons BY 2.0 license.
Photo by Gopal Vijayaraghavan, available under Creative Commons BY 2.0 license.
https://aws.amazon.com/de/message/5467D2/
Manigfold architecture options
https://blog.bernd-ruecker.com/architecture-options-to-run-a-workflow-engine-6c2419902d91
Distributed
Transactions
Distributed
Transactions
Compensation – the classical example
Saga
book
hotel
book
car
book
flight
cancel
hotel
cancel
car
1. 2. 3.
5.6.
In case of failure
trigger compensations
book
trip
2 alterntive approaches: choreography & orchestration
Event-driven choreography
Hotel
Flight
Car
Trip
Trip
booked
Flight
booked
Trip
requested
Hotel
booked
Car
booked
Request
trip
Event-driven choreography
Hotel
Flight
Car
Trip
Trip
failed
Trip
requested
Hotel
booked
Car
booked
Request
trip
Flight
failed
Car
canceled
Hotel
canceled
Perform undo
(cancel car booking)
Perform undo
(cancel hotel)
Implementing changes in the process
Hotel
Flight
Car
Trip
Trip
failed
Trip
requested
Hotel
booked
Car
booked
Request
trip
Flight
failed
Car
canceled
Hotel
canceled
We have a new basic agreement
with the car rental agency and
can cancel for free within 1 hour
– do that first!
Implementing changes in the process
Hotel
Flight
Car
Trip
Trip
failed
Trip
requested
Hotel
booked
Car
booked
Request
trip
Flight
failed
Car
canceled
Hotel
canceled
You have to adjust all services and redeploy at the same time!
We have a new basic agreement
with the car rental agency and
can cancel for free within 1 hour
– do that first!
What we wanted
Photo by Lijian Zhang, available under Creative Commons SA 2.0 License
Orchestration
Hotel
Flight
Car
Trip
Trip
booked
Request
trip
Book
hotel
Hotel
booked
Car
booked
Flight
booked
Book
car
Book
flight
Orchestration
Hotel
Flight
Car
Trip
Trip
booked
Request
trip
Book
hotel
Hotel
booked
Car
booked
Flight
booked
Book
car
Book
flight
We have a new basic agreement
with the car rental agency and
can cancel for free within 1 hour
– do that first!
You have to adjust one service and redeploy only this one!
Describe orchestration with BPMN
Trip
Trip
booked
Request
trip
The workflow is part of the service
Trip
The workflow is part of the service
Trip
Payment
Live hacking
https://github.com/flowing/flowing-retail/blob/master/payment-
rest/src/main/java/io/flowing/retail/payment/port/resthacks/PaymentRestHacksControllerV6.java
has to implement
Timeout, Retry,
Compensation
has to offer
Compensation
has to implement
Idempotency
Client Service Provider
has to implement
Timeout, Retry,
Compensation
has to offer
Compensation
has to implement
Idempotency
Client Service ProviderDon‘t forget
about state
# Be aware of complexity of distributed systems
# Know strategies and tools to handle it
e.g. Circuit breaker (Hystrix)
Workflow engine for stateful retry, waiting, timeout
and compensation (Camunda)
Thank you!

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