Moving Forwards with Microservices
undefined
Moving
Forwards
with
Microservices
Brownfield
Microservices
Greenfield
Microservices
Microservices
Provisos
Module
Overview
Brownfield
Microservices
Approach
|
Migration
|
Database
Migration
|
Transactions
|
Reporting
Brownfield
Microservices:
Approach
•
Existing
s
y
s
t
em
•
M
onolithic
s
y
s
t
em
•
O
r
ganically
g
r
o
wn
•
S
eems
t
o
la
r
ge
t
o
split
•
Lacks
mic
r
ose
r
vi
c
es
desi
g
n
p
r
inciples
•
Ide
n
tify
seams
•
S
epa
ra
tion
th
a
t
r
e
fl
e
c
ts
domains
•
Iden
tify
bounded
c
o
n
t
e
x
ts
•
S
ta
r
t
modula
r
ising
the
bounded
c
o
n
t
e
x
ts
•
M
o
v
e
c
ode
inc
r
eme
n
tally
•
T
idy
up
a
se
c
tion
per
r
elease
•
T
ake
y
our
time
•
Existing
fun
c
tionali
t
y
needs
t
o
r
emain
i
n
ta
c
t
•
Run
unit
t
ests
and
i
n
t
e
g
r
a
tion
t
ests
t
o
v
alida
t
e
change
•
Keep
r
eviewing
•
S
eams
a
r
e
futu
r
e
mic
r
ose
r
vi
c
e
bounda
r
ies
Business
I
n
te
r
net
Customer
Shopping
website
Internal
Suppo
r
t
website
D
a
tabase
Data
A
cc
ess
S
e
rvi
c
e
Brownfield
Microservices:
Approach
•
Existing
s
y
s
t
em
•
M
onolithic
s
y
s
t
em
•
O
r
ganically
g
r
o
wn
•
S
eems
t
o
la
r
ge
t
o
split
•
Lacks
mic
r
ose
r
vi
c
es
desi
g
n
p
r
inciples
•
Ide
n
tify
seams
•
S
epa
ra
tion
th
a
t
r
e
fl
e
c
ts
domains
•
Iden
tify
bounded
c
o
n
t
e
x
ts
•
S
ta
r
t
modula
r
ising
the
bounded
c
o
n
t
e
x
ts
•
M
o
v
e
c
ode
inc
r
eme
n
tally
•
T
idy
up
a
se
c
tion
per
r
elease
•
T
ake
y
our
time
•
Existing
fun
c
tionali
t
y
needs
t
o
r
emain
i
n
ta
c
t
•
Run
unit
t
ests
and
i
n
t
e
g
r
a
tion
t
ests
t
o
v
alida
t
e
change
•
Keep
r
eviewing
•
S
eams
a
r
e
futu
r
e
mic
r
ose
r
vi
c
e
bounda
r
ies
Acc
ou
n
ts
Service
P
r
odu
c
ts
Service
Orders
S
e
rvic
e
Accounts
Department
Orders
Department
Stock
Department
Brownfield
Microservices:
Migration
•
C
ode
is
o
r
ganised
i
n
t
o
bounded
c
o
n
t
e
x
ts
•
C
ode
r
el
a
t
ed
t
o
a
business
domain
or
fun
c
tion
is
in
one
pla
c
e
•
Clear
bounda
r
ies
with
clear
i
n
t
e
r
fa
c
es
bet
w
een
each
•
C
o
n
v
e
r
t
bounded
c
o
n
t
e
x
ts
i
n
t
o
mic
r
ose
r
vi
c
es
•
Start
of
f
with
one
•
U
se
t
o
get
c
om
f
o
r
table
•
M
ake
it
swi
t
chable
•
M
ai
n
tain
t
w
o
v
ersions
of
the
c
ode
•
H
o
w
t
o
p
r
io
ritise
wh
a
t
t
o
split?
•
B
y
r
isk
•
B
y
t
echnology
•
B
y
dependencies
•
I
nc
r
eme
n
tal
app
r
oach
•
I
n
t
e
g
r
a
ting
with
the
monolithic
•
M
oni
t
or
both
f
or
impa
c
t
•
M
oni
t
or
ope
r
a
tions
th
a
t
talk
t
o
mic
r
ose
r
vi
c
es
•
R
eview
and
imp
r
o
v
e
inf
r
astru
c
tu
r
e
•
I
nc
r
eme
n
tally
the
monolithic
will
be
c
o
n
v
e
r
t
ed
Acc
ou
n
ts
P
r
odu
c
ts
I
n
ve
n
t
o
r
y
P
r
omotions
Internet
C
us
t
omer
Shopping
website
Orders
Internal
Suppo
r
t
website
D
a
tabase
Data
Acc
ess
S
e
rvic
e
Brownfield
Microservices:
Migration
•
C
ode
is
o
r
ganised
i
n
t
o
bounded
c
o
n
t
e
x
ts
•
C
ode
r
el
a
t
ed
t
o
a
business
domain
or
fun
c
tion
is
in
one
pla
c
e
•
Clear
bounda
r
ies
with
clear
i
n
t
e
r
fa
c
es
bet
w
een
each
•
C
o
n
v
e
r
t
bounded
c
o
n
t
e
x
ts
i
n
t
o
mic
r
ose
r
vi
c
es
•
S
ta
r
t
of
with
one
•
U
se
t
o
get
c
om
f
o
r
table
•
M
ake
it
swi
t
chable
•
M
ai
n
tain
t
w
o
v
ersions
of
the
c
ode
•
H
o
w
t
o
p
r
io
ritise
wh
a
t
t
o
split?
•
B
y
r
isk
•
B
y
t
echnology
•
B
y
dependencies
•
I
nc
r
eme
n
tal
app
r
oach
•
I
n
t
e
g
r
a
ting
with
the
monolithic
•
M
oni
t
or
both
f
or
impa
c
t
•
M
oni
t
or
ope
r
a
tions
th
a
t
talk
t
o
mic
r
ose
r
vi
c
es
•
R
eview
and
imp
r
o
v
e
inf
r
astru
c
tu
r
e
•
I
nc
r
eme
n
tally
the
monolithic
will
be
c
o
n
v
e
r
t
ed
A
cc
ou
n
ts
A
cc
ou
n
ts
Products
I
n
ve
n
t
o
r
y
P
r
omotions
I
n
te
r
net
Customer
Shopping
website
O
r
ders
Internal
Suppo
r
t
website
Data
A
cc
ess
D
a
tabase
Data
A
cc
ess
S
e
r
vi
c
e
A
cc
ou
n
ts
Service
M
essage
Broker
Central
M
oni
t
o
r
ing
Central
L
og
g
ing
Brownfield
Microservices:
Migration
•
C
ode
is
o
r
ganised
i
n
t
o
bounded
c
o
n
t
e
x
ts
•
C
ode
r
el
a
t
ed
t
o
a
business
domain
or
fun
c
tion
is
in
one
pla
c
e
•
Clear
bounda
r
ies
with
clear
i
n
t
e
r
fa
c
es
bet
w
een
each
•
C
o
n
v
e
r
t
bounded
c
o
n
t
e
x
ts
i
n
t
o
mic
r
ose
r
vi
c
es
•
S
ta
r
t
of
with
one
•
U
se
t
o
get
c
om
f
o
r
table
•
M
ake
it
swi
t
chable
•
M
ai
n
tain
t
w
o
v
ersions
of
the
c
ode
•
H
o
w
t
o
p
r
io
ritise
wh
a
t
t
o
split?
•
B
y
r
isk
•
B
y
t
echnology
•
B
y
dependencies
•
I
nc
r
eme
n
tal
app
r
oach
•
I
n
t
e
g
r
a
ting
with
the
monolithic
•
M
oni
t
or
both
f
or
impa
c
t
•
M
oni
t
or
ope
r
a
tions
th
a
t
talk
t
o
mic
r
ose
r
vi
c
es
•
R
eview
and
imp
r
o
v
e
inf
r
astru
c
tu
r
e
•
I
nc
r
eme
n
tally
the
monolithic
will
be
c
o
n
v
e
r
t
ed
Acco
u
n
ts
Service
P
r
odu
c
ts
Service
I
n
v
e
n
t
o
r
y
S
e
r
v
i
c
e
Promotions
S
e
r
v
i
c
e
API
G
a
t
e
w
a
y
Internet
Customer
Shopping
website
Orders
S
e
r
v
i
c
e
Internal
Suppo
r
t
website
M
essage
Broker
Central
M
oni
t
o
r
ing
Central
L
og
g
ing
Brownfield
Microservices:
Database
Migration
•
A
v
oid
sha
r
ed
d
a
tabases
•
Split
d
a
tabases
using
seams
•
R
el
a
t
e
tables
t
o
c
ode
seams
•
Suppo
r
ting
the
e
xisting
applic
a
tion
•
D
a
ta
l
a
y
er
th
a
t
c
onne
c
ts
t
o
multiple
d
a
tabase
•
T
ables
th
a
t
link
ac
r
oss
seams
•
API
calls
th
a
t
can
f
e
t
ch
th
a
t
d
a
ta
f
or
a
r
el
a
tionship
•
R
efa
c
t
or
d
a
tabase
i
n
t
o
multiple
d
a
tabases
•
D
a
ta
r
e
f
e
r
e
n
tial
i
n
t
e
g
r
i
t
y
•
S
t
a
tic
d
a
ta
tables
•
Sha
r
ed
d
a
ta
Accounts
Accounts
P
r
odu
c
ts
Inventory
P
r
omotions
O
r
ders
Data
Acc
ess
D
a
tabase
Data
Acc
ess
S
e
rvi
c
e
Acc
ou
n
ts
Service
M
essage
Broker
Central
M
oni
t
o
r
ing
Central
L
og
g
ing
Brownfield
Microservices:
Database
Migration
•
A
v
oid
sha
r
ed
d
a
tabases
•
Split
d
a
tabases
using
seams
•
R
el
a
t
e
tables
t
o
c
ode
seams
•
Suppo
r
ting
the
e
xisting
applic
a
tion
•
D
a
ta
l
a
y
er
th
a
t
c
onne
c
ts
t
o
multiple
d
a
tabase
•
T
ables
th
a
t
link
ac
r
oss
seams
•
API
calls
th
a
t
can
f
e
t
ch
th
a
t
d
a
ta
f
or
a
r
el
a
tionship
•
R
efa
c
t
or
d
a
tabase
i
n
t
o
multiple
d
a
tabases
•
D
a
ta
r
e
f
e
r
e
n
tial
i
n
t
e
g
r
i
t
y
•
S
t
a
tic
d
a
ta
tables
•
Sha
r
ed
d
a
ta
Acco
u
n
ts
Service
P
r
odu
c
ts
Service
I
n
v
e
n
t
o
r
y
S
e
r
v
i
c
e
P
r
om
otions
S
e
r
v
i
c
e
API
G
a
t
e
w
a
y
Internet
Customer
Shopping
website
Orders
S
e
r
v
i
c
e
Internal
Suppo
r
t
website
M
essage
Broker
Central
M
oni
t
o
r
ing
Central
L
og
g
ing
Brownfield
Microservices:
Transactions
•
T
r
ansa
c
tions
ensu
r
e
d
a
ta
i
n
t
e
g
r
i
t
y
•
T
r
ansa
c
tions
a
r
e
simple
in
monolithic
applica
tions
•
T
r
ansa
c
tions
spanning
mic
r
ose
r
vi
c
es
a
r
e
c
ompl
e
x
•
C
ompl
e
x
t
o
obse
r
v
e
•
C
ompl
e
x
t
o
p
r
oblem
sol
v
e
•
C
ompl
e
x
t
o
r
ollback
•
Options
f
or
failed
t
r
ansa
c
tions
•
T
r
y
again
la
t
er
•
A
bo
r
t
e
n
ti
r
e
t
r
ansa
c
tion
•
U
se
a
t
r
ansa
c
tion
manager
•
T
w
o
phase
c
ommit
•
Disad
v
a
n
tage
of
t
r
ansa
c
tion
manager
•
R
elian
ce
on
t
r
ansa
c
tion
manager
•
D
el
a
y
in
p
r
o
c
essing
•
P
o
t
e
n
tial
bottleneck
•
C
ompl
e
x
t
o
impleme
n
t
•
Dist
r
ibu
t
ed
t
r
ansa
c
tion
c
omp
a
tibili
t
y
•
C
omple
t
ed
message
f
or
the
monolith
A
cc
ou
n
ts
Service
P
r
odu
c
ts
Service
Orders
S
e
rvic
e
Promotions
Service
Place
Order
API
G
a
t
e
w
a
y
I
n
t
e
r
net
Client
T
r
ansa
c
tion
Manager
M
essage
Broker
Internal
Suppo
r
t
website
Shopping
website
1
2
3
4
Brownfield
Microservices:
Transactions
•
T
r
ansa
c
tions
ensu
r
e
d
a
ta
i
n
t
e
g
r
i
t
y
•
T
r
ansa
c
tions
a
r
e
simple
in
monolithic
applica
tions
•
T
r
ansa
c
tions
spanning
mic
r
ose
r
vi
c
es
a
r
e
c
ompl
e
x
•
C
ompl
e
x
t
o
obse
r
v
e
•
C
ompl
e
x
t
o
p
r
oblem
sol
v
e
•
C
ompl
e
x
t
o
r
ollback
•
Options
f
or
failed
t
r
ansa
c
tions
•
T
r
y
again
la
t
er
•
A
bo
r
t
e
n
ti
r
e
t
r
ansa
c
tion
•
U
se
a
t
r
ansa
c
tion
manager
•
T
w
o
phase
c
ommit
•
Disad
v
a
n
tage
of
t
r
ansa
c
tion
manager
•
R
elian
ce
on
t
r
ansa
c
tion
manager
•
D
el
a
y
in
p
r
o
c
essing
•
P
o
t
e
n
tial
bottleneck
•
C
ompl
e
x
t
o
impleme
n
t
•
Dist
r
ibu
t
ed
t
r
ansa
c
tion
c
omp
a
tibili
t
y
•
C
omple
t
ed
message
f
or
the
monolith
Accounts
Accounts
P
r
odu
c
ts
Inventory
P
r
omotions
O
r
ders
Data
A
cc
ess
D
a
tabase
Data
A
cc
ess
S
e
r
vi
c
e
A
cc
ou
n
ts
Service
M
essage
Broker
Central
M
oni
t
o
r
ing
Central
L
og
g
ing
Brownfield
Microservices:
Reporting
•
M
ic
r
ose
r
vi
c
es
complic
a
t
e
r
epo
r
ting
•
D
a
ta
split
ac
r
oss
mic
r
ose
r
vi
c
es
•
No
c
e
n
t
r
al
d
a
tabase
•
Joining
d
a
ta
ac
r
oss
d
a
tabases
•
Sl
o
w
er
r
epo
r
ting
•
C
omplic
a
t
e
r
epo
r
t
de
v
elopme
n
t
•
P
ossible
solutions
•
S
e
rvi
c
e
calls
f
or
r
epo
r
t
d
a
ta
•
D
a
ta
dumps
•
C
onsolid
ation
e
n
vi
r
onme
n
t
A
cc
ou
n
ts
Service
Orders
S
e
r
vi
c
e
P
r
odu
c
ts
Service
——
—
——
——
—
—
——
—
—
—
—
Report
Brownfield
Microservices:
Reporting
•
M
ic
r
ose
r
vi
c
es
complic
a
t
e
r
epo
r
ting
•
D
a
ta
split
ac
r
oss
mic
r
ose
r
vi
c
es
•
No
c
e
n
t
r
al
d
a
tabase
•
Joining
d
a
ta
ac
r
oss
d
a
tabases
•
Sl
o
w
er
r
epo
r
ting
•
C
omplic
a
t
e
r
epo
r
t
de
v
elopme
n
t
•
P
ossible
solutions
•
S
e
rvi
c
e
calls
f
or
r
epo
r
t
d
a
ta
•
D
a
ta
dumps
•
C
onsolid
ation
e
n
vi
r
onme
n
t
Acc
ou
n
ts
Service
Orders
S
e
rvic
e
P
r
odu
c
ts
Service
——
—
——
——
—
—
——
—
—
—
—
Report
R
epo
r
ting
Service
Brownfield
Microservices:
Reporting
•
M
ic
r
ose
r
vi
c
es
complic
a
t
e
r
epo
r
ting
•
D
a
ta
split
ac
r
oss
mic
r
ose
r
vi
c
es
•
No
c
e
n
t
r
al
d
a
tabase
•
Joining
d
a
ta
ac
r
oss
d
a
tabases
•
Sl
o
w
er
r
epo
r
ting
•
C
omplic
a
t
e
r
epo
r
t
de
v
elopme
n
t
•
P
ossible
solutions
•
S
e
rvi
c
e
calls
f
or
r
epo
r
t
d
a
ta
•
D
a
ta
dumps
•
C
onsolid
ation
e
n
vi
r
onme
n
t
Acc
ou
n
ts
Service
Orders
S
e
rvic
e
P
r
odu
c
ts
Service
——
—
——
——
—
—
——
—
—
—
—
Report
R
epo
r
ting
Service
Reporting
Database
Greenfield
Microservices
Introduction
|
Approach
Greenfield
Microservices:
Introduction
•
New
p
r
oje
c
t
•
E
v
olving
r
equi
r
eme
n
ts
•
Business
domain
•
Not
fully
unders
t
ood
•
Getting
domain
e
xpe
r
ts
i
n
vol
v
ed
•
S
y
s
t
em
bounda
r
ies
will
e
v
ol
v
e
•
T
eams
e
xpe
r
ien
c
e
•
F
irst
mic
r
ose
r
vi
c
e
•
Expe
r
ien
c
ed
with
mic
r
ose
r
vi
c
es
•
Existing
s
y
s
t
em
i
n
t
e
g
r
a
tion
•
M
onolithic
s
y
s
t
em
•
Established
mic
r
ose
r
vi
c
es
a
r
chi
t
e
c
tu
r
e
•
P
ush
f
or
change
•
Changes
t
o
apply
mic
r
ose
r
vi
c
e
p
r
inciples
New
S
y
s
t
em
Dev
Team
Domain
Experts
Greenfield
Microservices:
Approach
•
Sta
r
t
of
f
with
monolithic
design
•
H
igh
le
vel
•
E
v
olving
seams
•
D
e
v
elop
a
r
eas
i
n
t
o
modules
•
B
ounda
r
ies
sta
r
t
t
o
be
c
ome
clea
r
er
•
R
e
fi
ne
and
r
efa
c
t
or
desi
g
n
•
Split
fu
r
ther
when
r
equi
r
ed
•
M
odules
be
c
ome
se
r
vi
c
es
•
Sha
r
eable
c
ode
lib
r
a
r
ies
p
r
omo
te
t
o
se
r
vi
c
e
•
R
eview
mic
r
ose
r
vi
c
e
pr
inciples
a
t
each
stage
•
P
r
io
r
itise
b
y
•
M
inimal
viable
p
r
odu
c
t
•
C
us
t
omer
needs
and
demand
A
cc
ou
n
ts
P
r
odu
c
ts
Inventory
P
r
omotions
O
r
ders
Microservices
Provisos
Microservices
Provisos
•
A
cc
epting
initial
e
xpense
•
L
onger
de
v
elopme
n
t
times
•
C
ost
and
t
r
aining
f
or
t
ools
and
new
s
k
ills
•
S
k
illing
up
f
or
dist
r
ibu
t
ed
s
y
s
t
ems
•
Handling
dist
r
ibu
t
ed
t
r
ansa
c
tions
•
Handling
r
epo
r
ting
•
A
dditional
t
esting
r
esou
r
c
e
•
L
a
t
en
c
y
and
pe
r
f
or
man
c
e
t
esting
•
T
esting
f
or
r
esilien
ce
•
I
mp
r
o
ving
inf
r
astru
c
tu
r
e
•
S
ecur
i
t
y
•
Pe
r
f
or
man
c
e
•
R
elian
ce
•
O
v
e
r
head
t
o
mange
mic
r
ose
r
vi
c
es
•
Cloud
t
echnolo
g
ies
•
C
ultu
r
e
change
I
mp
r
o
v
ed
Inrastructure
Skilling
up
Staff
Tools
to
test
and
manage
C
o
n
tinued
monitoring
and
logging
C
ultu
r
e
change
Longer
de
v
elopme
n
t
time
Acc
ou
n
ts
Service
P
r
odu
c
ts
Service
Stock
S
e
rvic
e
P
ostage
Service
Orders
S
e
rvic
e
Brownfield
Microservices
Greenfield
Microservices
Microservices
Provisos
Module
Summary
The brownfield microservices approach, migration strategies, and modularization techniques for existing systems. Learn how to identify bounded contexts, separate domains, and incrementally convert monolithic systems to microservices.
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Presentation Transcript
Module Overview Brownfield Microservices Greenfield Microservices Microservices Provisos
Brownfield Microservices Approach | Migration | Database Migration | Transactions | Reporting
Brownfield Microservices:Approach Existing system Monolithic system Organically grown Seems to large to split Shopping website Lacks microservices design principles Identify seams Separation that reflects domains Data Access Database Service Business Customer Identify bounded contexts Start modularising the bounded contexts Internal Support website Move code incrementally Tidy up a section per release Take your time Existing functionality needs to remain intact Run unit tests and integration tests to validate change Internet Keep reviewing Seams are future microservice boundaries
Brownfield Microservices:Approach Existing system Monolithic system Organically grown Accounts Service Seems to large to split Lacks microservices design principles AccountsDepartment Identify seams Separation that reflects domains Orders Service Identify bounded contexts OrdersDepartment Start modularising the bounded contexts Move code incrementally Tidy up a section per release Products Service Take your time StockDepartment Existing functionality needs to remain intact Run unit tests and integration tests to validate change Keep reviewing Seams are future microservice boundaries
Brownfield Microservices:Migration Code is organised into bounded contexts Code related to a business domain or function is in one place Clear boundaries with clear interfaces between each Convert bounded contextsinto microservices Accounts Start off with one Shopping website Use to get comfortable Orders Make it switchable Maintain two versions of the code Data Access How to prioritise what to split? Service Promotions Database Customer By risk By technology Inventory By dependencies Internal Support website Incremental approach Products Integrating with the monolithic Monitor both for impact Monitor operations that talk to microservices Internet Review and improve infrastructure Incrementally the monolithic will be converted
Brownfield Microservices:Migration Code is organised into bounded contexts Code related to a business domain or function is in one place Message Broker Accounts Service Central Monitoring Clear boundaries with clear interfaces between each Convert bounded contextsinto microservices Start of with one Data Access Central Logging Use to get comfortable Accounts Accounts Make it switchable Shopping website Maintain two versions of the code Orders How to prioritise what to split? By risk Service Promotions Database Customer By technology Data Access By dependencies Inventory Internal Support website Incremental approach Integrating with the monolithic Products Monitor both for impact Monitor operations that talk to microservices Internet Review and improve infrastructure Incrementally the monolithic will be converted
Brownfield Microservices:Migration Code is organised into bounded contexts Central Monitoring Central Logging Code related to a business domain or function is in one place Clear boundaries with clear interfaces between each Convert bounded contextsinto microservices Accounts Service Start of with one Use to get comfortable Shopping website Promotions Service Make it switchable Maintain two versions of the code How to prioritise what to split? Orders Service By risk By technology By dependencies Internal Support website Inventory Service Incremental approach Customer Integrating with the monolithic Products Service Monitor both for impact Monitor operations that talk to microservices Review and improve infrastructure API Message Broker Internet Incrementally the monolithic will be converted Gateway
Brownfield Microservices: DatabaseMigration Avoid shared databases Message Broker Accounts Service Central Monitoring Split databases using seams Relate tables to code seams Supporting the existing application Data Access Central Logging Accounts Accounts Data layerthat connects to multiple database Tables that link across seams Orders API calls that can fetch that data for a relationship Refactordatabase into multiple databases Service Promotions Database Data referential integrity Data Access Static data tables Inventory Shared data Products
Brownfield Microservices: DatabaseMigration Avoid shared databases Central Monitoring Central Logging Split databases using seams Relate tables to code seams Accounts Service Supporting the existing application Shopping website Data layerthat connects to multiple database Promotions Service Tables that link across seams API calls that can fetch that data for a relationship Orders Service Refactordatabase into multiple databases Internal Support website Data referential integrity Inventory Service Customer Static data tables Products Service Shared data API Message Broker Internet Gateway
Brownfield Microservices:Transactions Transactions ensure data integrity 3 Transactions are simple in monolithic applications Accounts Service Transactions spanning microservices are complex Shopping website Complex to observe 2 Promotions Service Complex to problem solve Complex to rollback Options for failed transactions Transaction Manager Try again later Abort entire transaction PlaceOrder 1 Use a transaction manager Internal Support website Orders Service Two phase commit Disadvantage of transaction manager Client Reliance on transaction manager 4 Products Service Delay in processing Potential bottleneck Complex to implement Message Broker API Internet Gateway Distributed transaction compatibility Completed message for the monolith
Brownfield Microservices:Transactions Transactions ensure data integrity Message Broker Accounts Service Central Monitoring Transactions are simple in monolithic applications Transactions spanning microservices are complex Complex to observe Complex to problem solve Data Access Central Logging Accounts Accounts Complex to rollback Options for failed transactions Try again later Orders Abort entire transaction Use a transaction manager Service Promotions Two phase commit Database Disadvantage of transaction manager Data Access Reliance on transaction manager Inventory Delay in processing Potential bottleneck Complex to implement Products Distributed transaction compatibility Completed message for the monolith
Brownfield Microservices:Reporting Microservices complicate reporting Data split across microservices Accounts Service Orders Service Products Service No central database Joining data across databases Slowerreporting Complicate report development Possible solutions Report Service calls for report data Data dumps Consolidation environment
Brownfield Microservices:Reporting Microservices complicate reporting Data split across microservices Accounts Service Orders Service Products Service No central database Joining data across databases Slowerreporting Complicate report development Reporting Service Possible solutions Service calls for report data Report Data dumps Consolidation environment
Brownfield Microservices:Reporting Microservices complicate reporting Data split across microservices Accounts Service Orders Service Products Service No central database Joining data across databases Slowerreporting Reporting Database Complicate report development Possible solutions Reporting Service Service calls for report data Data dumps Report Consolidation environment
Greenfield Microservices Introduction | Approach
Greenfield Microservices:Introduction New project Evolving requirements Domain Experts Business domain Not fully understood Getting domain experts involved System boundaries will evolve Teams experience New System First microservice Experienced with microservices Existing system integration Monolithic system Established microservices architecture Push for change Changes to apply microservice principles DevTeam
Greenfield Microservices:Approach Start off with monolithic design High level Accounts Evolving seams Develop areas into modules Boundaries startto become clearer Orders Refine and refactor design Split further when required Promotions Modules become services Shareable code libraries promote to service Inventory Review microservice principles at each stage Products Prioritise by Minimal viable product Customer needs and demand
Microservices Provisos Accepting initial expense Longer development times Improved Inrastructure Skillingup Staff Cost and training for tools and new skills Skilling up for distributed systems Accounts Service Handling distributed transactions Handling reporting Postage Service Additional testing resource Longer development time Culture change Latency and performance testing Testing for resilience Orders Service Improving infrastructure Security Stock Service Performance Reliance Overhead to mange microservices Products Service Cloud technologies Culture change Tools to testand manage Continued monitoring andlogging
Module Summary Brownfield Microservices Greenfield Microservices Microservices Provisos
