Agile and A3 at the European Lean IT Summit 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

TEAM Agile and A3 - Philippe Blayo & Antoine Contal

20K€

Consulting

Building

Project

Termination

THE PRICE:

POST MORTEM A3

Component

API Width

Decision

Making Agile and A3 - Philippe Blayo & Antoine Contal

blayo in blayo dot org

antoine dot contal in gmail dot com

stats losses Agile and A3 - Philippe Blayo & Antoine Contal

EXPERT Agile and A3 - Philippe Blayo & Antoine Contal

one year later

HTTP Access Freeze #

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

freeze duration #

101569 milliseconds

101245 milliseconds

freeze duration HTTP freeze duration = DB lock duration

BEFORE

unlock Agile and A3 - Philippe Blayo & Antoine Contal

unlock

CHECK:

1.5 Days

(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

Spike in I/O =>

Blame I/O Config

Lone event

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

Check OK

How did the

expert do it?

Production

Micro bench:

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:

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/

More Lean IT presentations and videos on www.lean-it-summit.com

Agile and A3 at the European Lean IT Summit 2012

Technology

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