Azure Microservices in Practice, Radu Vunvulea, ITCamp 2016

@ITCAMPRO #ITCAMP16Community Conference for IT Professionals
Azure Microservices in Practice
Radu Vunvulea
Solution Architect, iQuest Technologies
Microsoft Azure MVP
@RaduVunvulea

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WCF WPF ENTHUSIASTIC

Scope

WHAT ARE MICROSERVICES?

Software architecture style in which complex
applications are composed of small, independent
processes communicating with each other using
language-agnostic APIs
Microservices

WHY WE SHOULD USE
MICROSERVICES?

If we need a system that should be…
High decoupled
Small
Easy to replace
Focus on doing a small task
Independent deployment units
Symmetrical architecture

Evolution
Maintenance
is hard
Adding new
features is slow
Changes are
expensive
Technology
becomes the
obstacle rather
than enabler
App Modernization

(AZURE) SERVICE FABRIC

• Service Fabric
• Azure Service Fabric
Why we have two different things?
?

Service Fabric | Azure Service Fabric
Microservices
Cloud
…
Azure
Azure Service
Fabric
AWS Service Fabric
On-premises Service Fabric

Overview
Service Fabric
Azure
Windows
Server
Linux
On-premises
Windows
Server
Linux
Hosted clouds
Windows
Server
Linux
Micros
ervice
Micros
ervice
Micros
ervice
Micros
ervice
Micros
ervice

SERVICE TYPE

ReliableService •Classical
service
•Reliable
•Available
•Scalable
Actor
•State
•Turn-base
access
•Single
thread
•Reentrancy

Stateless •No state
persisted
between
calls
Stateful
•‘A’ state
is
persisted
between
calls

What can we run in Service Fabric?
Service Fabric
Web Sites
Application
Custom
logic

• Multiple programing languages (C# & Java)
• Support different commucation mechanisms:
–HTTP(s)
–WCF
–TCP
–UDP
• Any protocol and communication stack is supported
• Capable to run a guest executable
How

SERVICE LIFECYCLE

Reliable
Services Actors
Stateful
Stateless
State
StateState
First call…
Reliable
Collections

Reliable
Services Actors
Stateful
Stateless
State
State
… after the call is executed
State

Reliable
Services Actors
Stateful
Stateless
State
State
… when GC is triggered
State

One UI for all environments

DEBUGGING AND TRACING

• Local debugging like any other .NET application
• Attach debugger to any Service Fabric Application
(on-premises or cloud)
• Diagnostic Events persistent in Cluster
• Real time Streaming Traces (Diagnostics Events)
Debugging and tracing

• Low latency
• High-throughput
• Transactional
• Can be used only
with Reliable Services
Reliable Collections
Dictionary
and
Queue
Replicat
ed
Persiste
d
In-
memory
<<servic
e
instance
>>
Asynchr
onous
Transacti
onal

Where collection are stored

• Different instances of the same
service can access the same
Reliable Collection
• Instances from different
services cannot access the
same collection
Reliable Collection – Visibility

TIMERS AND REMINDERS

Timers and Reminders
Timers
Similar with .NET
Called at a specific
time interval
Reminders
Timer with
persistence
Trigered in all
circumstances
(deactivations and
failovers)
Concurrency
Turn based
concurrency
Stateful Actos only

• Context: Multiple calls to the same Reliable Actor
Concurrency

Concurrency

Execution flow:
• Reminder Trigger
• SetPrice
• SetStock
Concurrency

Events
• Send events and
notifications from
services to caller
• Allows us be notified at
different steps on when
an exception occurs
• Can be used only for
actor-client
communication

• On Actor:
– IActorEvents
– Trigger our custom events
• On source:
– Implement callback (Event Handler)
– Subscribe our Event Handler
Events

BEHIND THE SCENE

Partition and Replication

Fault Domains and Upgrade Domains

Where we can control them
Application
• Partitioning
• Replication
Cluster
• Fault Domain
• Upgrade Domain
• Naming Service
• Resource
Balancer
• Failover Manager

Question
Answers

{
“name” : “Radu Vunvulea,
“blog” : “vunvulearadu.blogspot.com”,
“email” : ”vunvulear@outlook.com”,
“socialMedia” :
{
“twitter” : “@RaduVunvulea”,
“fb” : “radu.vunvulea”
}
}

Today: Enjoy ITCamp Day 1
Tomorow: Enjoy ITCamp Day 2
Saturday: Take a look on
https://github.com/Azure/
servicefabric-samples

Azure Microservices in Practice, Radu Vunvulea, ITCamp 2016

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