Agile and A3 at the European Lean IT Summit 2012

Copyright © Institut Lean France 2012

22 & 23 November, 2012 Paris, France

Agile and A3

Philippe Blayo & Antoine Contal



Agile and A3

Agile and A3 - Philippe Blayo & Antoine Contal

Philippe Blayo & Antoine Contal



What are the

benefits of A3 and

PDCA for Agile

teams? Agile and A3 - Philippe Blayo & Antoine Contal



BOOST

THIS

AGILE

TEAM Agile and A3 - Philippe Blayo & Antoine Contal



20K€

Agile

Consulting




Team

Building




Project

Termination





TWICE

THE PRICE:

WHY?



POST MORTEM A3



Component

API Width




Fact

Based

Decision

Making Agile and A3 - Philippe Blayo & Antoine Contal



blayo in blayo dot org

antoine dot contal in gmail dot com



A3

about

stats losses Agile and A3 - Philippe Blayo & Antoine Contal



ASK

An

EXPERT Agile and A3 - Philippe Blayo & Antoine Contal




1

1




2

2




1 2

3 3



BATCH

FIXED





one year later




HTTP Access Freeze #

OF

HT

TP

AC

CE

SS

P

ER

M

INU

TE



LOG:


22:24:00 Lock end on table ... duration: 1 milliseconds

...


...






freeze duration #

OF

HT

TP

AC

CE

SS

P

ER

M

INU

TE

101569 milliseconds

101245 milliseconds

freeze duration HTTP freeze duration = DB lock duration



BEFORE

lock

read

write

unlock Agile and A3 - Philippe Blayo & Antoine Contal

AFTER

read

lock

write

unlock



CHECK:

1.5 Days

vs

Weeks




ACT

(lessons

learned) Agile and A3 - Philippe Blayo & Antoine Contal



Lesson #1

Log durations

to spot

concurrency

issues Agile and A3 - Philippe Blayo & Antoine Contal




Lesson #2

Chat with

an expert




DEVELOP

FASTER!



Adding people?




Pressuring people?




Key factor:

access to someone

who knows the

code? Agile and A3 - Philippe Blayo & Antoine Contal



GUIDE:

How to

manage it? Agile and A3 - Philippe Blayo & Antoine Contal



Hard - earned

devops

results Agile and A3 - Philippe Blayo & Antoine Contal



Quality of Service

collapse

Agile and A3



End to end

Bench




Spike in I/O =>

Blame I/O Config


t

I/O



Lone event

never

reproduced Agile and A3 - Philippe Blayo & Antoine Contal



Change

I/O config

=> Check NOK Agile and A3 - Philippe Blayo & Antoine Contal



PROTECT

CUSTOMER: SPLIT TRAFFIC




SPLIT TRAFFIC: OK



Add servers

=> Check NOK




Ask an Expert




Ask an Expert

Check OK




How did the

expert do it?




Production

data




Micro bench:

small

Java main() Agile and A3 - Philippe Blayo & Antoine Contal



Hypothesis:

I can imitate the expert

and investigate faster




6 months later




Worsening

response time




Hypothesis:

SQL query




Small main()

reproduces

issue Agile and A3 - Philippe Blayo & Antoine Contal



Code diff:

join

left join Agile and A3 - Philippe Blayo & Antoine Contal



Solution:

join in Java




Check OK - issue fixed

- only 1 day work

- small java main works!




What are the

benefits of A3 and

PDCA for Agile

teams? Agile and A3 - Philippe Blayo & Antoine Contal



Benefits of using A3 and

PDCA in an agile team

• Help your managers and clients to

make better decisions

• Avoid wasting time on wrong or

irrelevant causes and actions

• Become an outstanding developer




To play with us: blayo in blayo dot org

antoine dot contal in gmail dot com




References:


http://openclipart.org/





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Agile and A3 at the European Lean IT Summit 2012

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