developing apps faster

Building the perfect PHP app for the enterprise

Episode 2 : Developing apps fasterMaurice KherlakianTwitter: @mkherlakianEmail: maurice.kherlakian@roguewave.com

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Series overviewNow: Developing apps faster

September 28: Resolving problems and high availabilityYour reputation as a miracle worker is secure when using these principles to isolate faults, optimize scale, and synchronize sessions across clusters.

October 12: Optimizing performanceKeep users on your site by learning how to use background jobs and caching, measure performance, and make data-driven decisions.

Maurice KherlakianDirector of professional servicesRogue Wave Software

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Enterprise PHP is mission-critical

• Built securely• Delivers optimal performance + scale• Always on• Meets release timelines• Modernizes legacy business logic• Clear support path (production + LTS)

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What does deployment automation look like?• Amazon – 1 deployments/second

- Werner Vogels. CTO Amazon

• Etsy – 40 – 50 deployments/day

• Netflix – highly automated deployments and testing (Simian Army)techblog.netflix.com/2016/03/how-we-build-code-at-netflix.htmltechblog.netflix.com/2013/08/deploying-netflix-api.htmlquora.com/How-fast-is-Netflixs-development-cycle-in-practice

Poll #1:At what frequency do you deploy? • Multiple times a day• Once a day• Once a week• Once a quarter• Once a year

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Faster deployment

cycles

Faster application developme

nt=

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Faster deployment cycles benefits

• Faster feedback from your end users

• Faster development• More iterations• Better product overall

Faster deployment

cycles

Faster application

development=

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The traditional approach

Requirements

Design

Implementation

Verification

Maintenance

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WaterGile anyone?• Teams within an organization subscribing to Agile methodology• Teams often isolated – entire company didn’t buy into Agile

methodologies• Still gather requirements, but break the down into user stories

Poll #2:What development practice do you follow?• Waterfall principles• A combination f waterfall and Agile

(WaterGile – AgileFall)• Mainly Agile principles

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You are always behind!

• Technical debt keeps increasing

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Faster deployment

cycles

Faster application developme

nt=

Feedback loop and monitoring

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You’ve just released a feature

Add a map display of all available cars to rent in a 10 km radius Released to

everyone

Impact?

Overload – servers down, root cause

unknown

PANIC!

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You’ve just released a feature to some users

Add a map display of all available cars to rent in a 10 km radius Released to 20% of

users

Impact – compare with other 80%

through app monitoring system

Change in CPU consumption profiles for same amount of

users

Fix or turn feature off

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Tools that can help• Instrument your code

– PHP feature toggle (qandidate-toggle - ) – release to a subset of users

• Zend Server Monitoring – a complete solution to monitor the behavior of your application – so you will catch the 20% spike in CPU usage

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It’s working… ramp it up!

Add a map display of all available cars to rent in a 10 km radius Released to 50% of

users

10% more rentals per visitor on version with

map

Little to no change in performance

Release to everyone

Release automation

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It worked fine on dev!• Environment consistency

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Git

Developer’s code for map

featureCheck in

PackagePackaged app (parametrized

)

Staging

TEST

Prod

Rollback

Packaging for release

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Tools that can help• VMs and consistency

– Vagrant– Docker

• Deployment– Zend Server (deployment)– AWS code deploy

Continuous integration

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What is a CI server?• CI automates the various tasks of building,

packaging, testing and deploying

• If build breaks, up to developer that broke it to fix it

• If build passes, it CAN go all the way to production

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A typical CI pipeline

Git clone Composer install Unit test Package

Deploy to test

Functional test

Deploy to Staging

Deploy to prod

Add a map display of all available cars to rent in a 10 km radius

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Failure!

Git clone Composer install Unit test

FAIL Build 783 failed

Add a map display of all available cars to rent in a 10 km radius

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Tools that can help

Poll #3:Do you use a CI server?• Yes• No

Demo

Testing automation

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Testing at different stages• Unit testing

• Functional testing

• Integration testing

• Load testing

Reference: techblog.netflix.com/search/label/Integration%20Testing

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Cost of bug fixing

Stefan Priebsch – Advanced OOP and design patternsCredit: Stefan Priebsch

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Test early, test often!

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Add a map display of all available cars to rent in a 10 km radius

Simulate a browser request and ensure that a map loads, and that the map has the number of vehicles available for rent

Functional

getCars($criteria, $radius)

$map->plotCoordinates($cars)

$modelView->assign(‘map’, $map)

Unit

Load 1,000 concurrent search requests for cars from 1000 different locations

Load

Poll #4:Do you unit test?• Yes• No

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Tools that can help• ab, Jmeter, LoadRunner• PHPUnit• Behat – Mink• PHPspec

Frameworks/libraries

Poll #5:Do you use a framework?• Yes• No

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Evolution of frameworks• Component frameworks

• MVC out, middleware in

• Microservices architecture

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Tools that can helpSo many…

• Zend Framework: ZF3, Expressive, Apigility

• Laravel, Symfony, Yii, and many more

Writing code and left shifting

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Catch bugs early• Remember how a bug in prod can cost as much as 15X times the

cost of a bug in development?

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How do you catch bugs early?

• Test early, test often – when developing, test locally before committing

• Peer reviews

• Code instrumentation tools

What about hardware and infrastructure?

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Infrastructure should also be automated• Automate server provisioning

• Source control your environment configurations

• The goal is to fully rebuild an environment automatically in case of failure

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Another example – dealnews.com• In the past 2 weeks

– Deployed web application 64 times – average 6.5 times a day– Deployed configuration management changes 12 times– Deployed MySQL schema changes 13 times

- Courtesy of Brian Moon

Q&A

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Learn more

• Watch this webinar on demand

• Read the recap blog to see the results of the polls and Q&A session

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Stay tunedSeptember 28: Resolving problems and high availabilityYour reputation as a miracle worker is secure when using these principles to isolate faults, optimize scale, and synchronize sessions across clusters.

October 12: Optimizing performanceKeep users on your site by learning how to use background jobs and caching, measure performance, and make data-driven decisions.

Building the perfect PHP app for the enterprise

Episode 2 : Developing apps fasterMaurice KherlakianSeptember 14, 2016