What I learned migrating applications to the cloud - Experience SAP devX at DevSpace

PUBLIC
MATEUS AUBIN, SAP
MAY 03, 2018
WHAT I LEARNED
MIGRATING APPLICATIONS
TO THE CLOUD

2PUBLIC© 2018 SAP SE or an SAP affiliate company. All rights reserved. ǀ
IN SAP
SINCE 2018
SOFTWARE DEVELOPER
SINCE 2008
CLOUD & BIG DATA
SINCE 2014
HI, MY NAME IS:
MATEUS AUBIN

“an IT paradigm that enables
ubiquitous access to shared pools of
configurable system resources and
higher-level services that can be
rapidly provisioned with minimal
management”
— good ol’ Wikipedia
WHAT IS THE CLOUD?

CAPEX vs OPEX
ECONOMIES OF
SCALE
ELASTIC CAPACITY
CLOUD DELIVERS BUSINESS VALUE

WHAT DO YOU NEED TO
CARE ABOUT?
 Latency
 Security
 Compose-ability
 Location Independence
 Recovery
 Scalability
LET’S SAY YOU WANT TO “CLOUD-ENABLE” YOUR
LEGACYAPPLICATION...

Load Balancing
Network Topologies
Distributed Architectures
WHAT DO YOU NEED TO
CARE ABOUT?
 Latency
 Security
 Compose-ability
 Recovery
 Scalability

Users and Groups
Access Control Lists
Principle of Least Privilege
WHAT DO YOU NEED TO
CARE ABOUT?
 Latency
 Security
 Compose-ability
 Recovery
 Scalability

Loose Coupling
Modular Development
Single Responsibility
WHAT DO YOU NEED TO
CARE ABOUT?
 Latency
 Security
 Compose-ability
 Recovery
 Scalability

Bootstrapping
Dynamic Configuration
Service Locators & Pointers
WHAT DO YOU NEED TO
CARE ABOUT?
 Latency
 Security
 Compose-ability
 Recovery
 Scalability

Isolation
Fault Tolerance
Graceful Degradation
WHAT DO YOU NEED TO
CARE ABOUT?
 Latency
 Security
 Compose-ability
 Recovery
 Scalability

Efficiency
Proportionality
Cost Effectiveness
WHAT DO YOU NEED TO
CARE ABOUT?
 Latency
 Security
 Compose-ability
 Recovery
 Scalability

WELL HOLD ON
FOR A SECOND…
IS THIS ANYTHING
NEW?

“fortunately or not,
no”
— pretentious guy in front
of an audience

Load Balancing
Network Topologies
Distributed Architectures
WHAT DO YOU NEED TO
CARE ABOUT?
 Latency
 Security
 Compose-ability
 Recovery
 Scalability

Users and Groups
Access Control Lists
Principle of Least Privilege
WHAT DO YOU NEED TO
CARE ABOUT?
 Latency
 Security
 Compose-ability
 Recovery
 Scalability

Loose Coupling
Modular Development
Single Responsibility
WHAT DO YOU NEED TO
CARE ABOUT?
 Latency
 Security
 Compose-ability
 Recovery
 Scalability

Bootstrapping
Dynamic Configuration
Service Locators & Pointers
WHAT DO YOU NEED TO
CARE ABOUT?
 Latency
 Security
 Compose-ability
 Recovery
 Scalability

Isolation
Fault Tolerance
Graceful Degradation
WHAT DO YOU NEED TO
CARE ABOUT?
 Latency
 Security
 Compose-ability
 Recovery
 Scalability

Efficiency
Proportionality
Cost Effectiveness
WHAT DO YOU NEED TO
CARE ABOUT?
 Latency
 Security
 Compose-ability
 Recovery
 Scalability

“the things that
make up a
great cloud
application are
the same
which make a
great
application.”
Learning #1

HOW DO I
PREPARE MY
SOFTWARE TO
THE CLOUD?
SO…

“assume failure.”

Pets vs.
Cattle
Chaos
Engineering
Distributed
Computing
Fallacies
ASSUME FAILURE

“de·cou·ple”

DE·COU·PLE
Single
Responsibility
Principle
Isolation Interfaces
Dependency
Injection

“cloud software
should be dynamic:
networks change,
servers come and go,
hardware fails and
configuration is
modified.”
Learning #2

WHICH TOOLS
CAN I USE TO
HELP ME?
… AND

“in computer
science, the term
idempotent is
used to describe
an operation that
will produce the
same results if
executed once or
multiple times.”
IDEMPOTENCY
ID OPERATION VALUE
4 DEPOSIT $ 200,00
5 WITHDRAW $ 50,00
6 WITHDRAW $ 75,00
balance = balance - 75;
var req = {
id: 6,
op: withdraw,
value: 75
};
bank.UpdateBalance(req);
a)
b)
Learning
#3

“is accomplished by
breaking the
problem into
independent parts
so that each
processing
element can
execute its part of
the algorithm
concurrently with
the others.”
PARALLELISM
Learning
#4
Bulk Synchronous Parallel
Embarrassingly Parallel
Divide and Conquer
Pipelines

“support the
exchange of general
purpose messages
in a distributed
application
environment
through message
passing and/or
message queuing
while ensuring
delivery.”
MESSAGE ORIENTED
MIDDLEWARES
Learning
#5
Message Bus
App
1
App
2
…
App
N
Queue
P.1
P.2
P.3
C.2
C.1
Pub/Sub
Topic.1 Topic.2
P.1
P.2
P.3
S.2
S.1
S.2

“with proper design, the
features come cheaply.
This approach is arduous,
but continues to succeed.”
— Dennis Ritchie
creator of Unix and C
MY TAKEAWAY HERE IS:

#1
“the things that
make up a great
cloud application
are the same
which make a
great application.”
#2
“cloud software
should be dynamic:
networks change,
servers come and go,
hardware fails and
configuration is
modified.”

#3
“in computer
science, the term
idempotent is used
to describe an
operation that will
produce the same
results if executed
once or multiple
times.”
#4
“is accomplished by
breaking the
problem into
independent parts
so that each
processing element
can execute its part
of the algorithm
concurrently with
the others.”
#5
“support the
exchange of general
purpose messages in
a distributed
application
environment through
message passing
and/or message
queuing while
ensuring delivery”

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