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The Next Generation of
Microservices
Phil Calçado
http://philcalcado.com
@pcalcado
The Next Generation of Microservices — YOW 2017 Brisbane
highly distributed
application architecture
We can think of microservices as
Highly distributed application
architectures are just a flavor of
distributed computing
Technical
Challenges
Organization
Challenges
Introducing distribution into your
architecture brings up new
Introducing distribution into your
architecture brings up new
The Next Generation of Microservices — YOW 2017 Brisbane
The example we will work with today:
Recovering from
temporary failure
Back in 2013…
The Next Generation of Microservices — YOW 2017 Brisbane
"I know, let’s use microservices”
Timeouts
Your code looks like this now
Biz Logic
Timeouts
server
client
Timeouts
Your code looks like this now
Biz Logic
Timeouts
RPC code
server
client
  🔥  🔥  🔥
The Next Generation of Microservices — YOW 2017 Brisbane
 🔥
wait
☺ 😰
 🔥 🔥
wait
☺ 😰
 🔥
☺
☺
☺
☺
☺
☺
☺
☺
"I know, let’s implement circuit breakers
and timeouts”
Circuit breakers
Timeouts
Your code looks like this now
Biz Logic
Timeouts
Telemetry
RPC code
server
client client client client client client
 🔥
wait
☺ 😰
 🔥 🔥
wait
☺ 😰
 🔥
☺
☺
☺
☺
☺
☺
☺
☺
 🔥
wait
☺ 😰
 🔥
  
🔥
☺
wait
😰 ☺
 🔥
  
🔥
wait
😰 ☺
 🔥
  
🔥
wait
😰 ☺
 🔥
  
🔥
…
🔥
🗑
"I know, let’s have all circuit
breakers share state”
"I know, let’s have all circuit
breakers share state”
Answer to the question “how did my
application ended up importing a
Zookeeper library again?"
Circuit breakers
Timeouts
Your code looks like this now
Biz Logic
Timeouts
Telemetry
RPC code
Distributed state
"I know, let’s have clients keep track of
healthy instances”
server
client
  🔥  🔥  🔥
server server serverserver
  🔥  🔥  🔥  💩
  🤔
Which instance should we talk to?
 ☺
DNS be like…
'
Circuit breakers
Timeouts
Your code looks like this now
Biz Logic
Timeouts
Telemetry
RPC code
Distributed state
Client-side
Service Discovery
And that’s just for RPC reliability.
What makes 2017 different?
Experience
reports
Open-source
software you
can use
Circuit breakers
Timeouts
Biz Logic
Timeouts
Telemetry
RPC code
Distributed state
Client-side
Service Discovery
SDK
Application
Transport
Internet
Network
Circuit breakers
Telemetry
RPC code
Distributed state
Client-side
Service Discovery
}TCP/IP
}?
One way to think about it
But how does one go
about adding a new layer
to the TCP/IP stack?
Sidecars to the rescue
Circuit breakers
Timeouts
Biz Logic
Timeouts
Telemetry
RPC code
Distributed state
Client-side
Service Discovery
SCARY OUTSIDE
WORLD
Sidecars to the rescue
Circuit breakers
Timeouts
Biz Logic
Timeouts
Telemetry
RPC code
Distributed state
Client-side
Service Discovery
SCARY OUTSIDE
WORLDSidecar
Sidecars to the rescue
The Next Generation of Microservices — YOW 2017 Brisbane
How does that impact your service?
Circuit breakers
Timeouts
Biz Logic
Timeouts
Telemetry
RPC code
Distributed state
Client-side
Service Discovery
Service
Platform
Biz Logic
Stability
Service
Platform
The Next Generation of Microservices — YOW 2017 Brisbane
Timeouts
Biz Logic
Stability
Service
Platform
Capacity Security Availability
Biz LogicService
Platform
Service Mesh
Allows our services to pretend some of those
are true
It’s not that these patterns aren’t
used anymore, it’s just that the
dumb work moved down the stack.
New, optmised, protocols are quite opaque
(e.g. gRPC and friends)
Works better with
metadata-rich protocols
It makes it even harder to fully replicate
production earlier in the development cycle
Coupled to the platform
Not everything will be part of the mesh,
i.e. the network still isn’t homogeneous
Leaky abstraction
Q&A

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