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Deploying Direct to
Production:
A Scientist approach
with Experiments
Who am I?
Mark Baker
Senior Software Engineer
MessageBird BV, Amsterdam
Coordinator and Developer of:
Open Source PHPOffice library
PHPExcel, PHPWord, PHPPowerPoint, PHPProject, PHPVisio
Minor contributor to PHP core (SPL Datastructures)
Other small open source libraries available on github
@Mark_Baker
https://github.com/MarkBaker
http://uk.linkedin.com/pub/mark-baker/b/572/171
http://markbakeruk.net
Why am I Here?
Why am I Here?
Deploying Direct
to Production
Deploying Direct
to Production
Deploying Direct
to Production
Deploying Direct
to Production
• If Releasing is Risky, then you
should fix your processes to reduce
that risk.
This isn’t about Eliminating Errors
It’s about making the process resilient
Deploying Direct
to Production
• Developers are also Software Owners
• Can deploy and rollback their own code
Deploying Direct to
Production – Ownership
• Smaller and more Frequent changes
are safer than large infrequent
changes
Deploying Direct to
Production –
Deployment
• Fail Fast, Fix Fast
• Verify the Changes immediately after
Deployment
Deploying Direct to
Production –
Deployment
• Observability-Driven Development
• Code so that any Changes can be
Verified
Deploying Direct to
Production –
Observability
Deploying Direct to
Production – Testing
Safe Testing in
Production
A Scientist
Approach
Scientist is an experimentation
framework that will allow you to
refactor and improve upon existing
code in a live environment, without
incurring risk or breakages.
A Scientist
Approach
Scientist
Originally developed at Github
https://github.blog/2016-02-03-scientist/
Branch by Abstraction
https://martinfowler.com/bliki/BranchByAbstraction.html
Branch by
Abstraction
“Branch by Abstraction” is a
technique for making a large-scale
change to a software system in
gradual way that allows you to
release the system regularly while
the change is still in-progress.
Branch by
Abstraction
Branch by
Abstraction
Branch by
Abstraction
Branch by
Abstraction
Branch by
Abstraction
Scientist
Scientist
Scientist
A Ruby library for carefully refactoring
critical paths.
https://github.com/github/scientist
A PHP library inspired by Scientist.
https://github.com/daylerees/scientist
https://scientist.readme.io/
Scientist
Experiments
$experiment = (new ScientistLaboratory)
->experiment('To take life on earth to the second birth')
->control($controlCallback)
->trial('A theme she had', $trialCallback1)
->trial('On a scheme he had', $trialCallback2);
$value = $experiment->run();
Experiments
chance()
Allows us to run the experiment only on
a random percentage of experiments
matcher()
Enables us to define custom rules for
comparing the control result with the
trial result
Experiments
Journals
Journals allow experiment data to be
sent to data stores for later
inspection. (PSR-3)
Reports
For viewing the results of Experiments
Experiments
Results
Time
Memory
Exceptions
Data Value Match/Non-match
Other Processes
Feature Flags
Easily Enable/Disable Changes in Code
Canary Deployments
Controlled Requests to Changed Code
Promote Releases Gracefully
A Scientist
Approach
Dank u wel!

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Deploying Straight to Production