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5 Real Life Examples on why Mobile Web and Mobile Native Apps failed and Which Metrics would have shown the problem early on. Using these metrics along your delivery chain allows you go get closer to full automated deployment pipeline but also making sure performance criteria is met
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Performance Quality Metrics for Mobile Web and Mobile Native
http://bit.ly/atd2014challenge
@grabnerandi
Why?
What?
It allows us to Evolve from …
Some Examples from Real Life
300 Deployments / Year
50-60 Deployments / Day
10+ Deployments / Day
Every 11.6 seconds
More details on Amazon
75% fewer outages since 2006
90% fewer outage minutes
~0.001% of deployments cause a problem
Instantaneous automatic rollback
Deploying every 11.6s
The “War Room” – back then
'Houston, we have a problem‘NASA Mission Control Center, Apollo 13, 1970
The “War Room” – NOW
Facebook – December 2012
5 Situations on
WHY this happens,
HOW to avoid it,
Metrics to look at
Don’t assume
You know the environment
1.3 Million iOS Apps
$ 10 billion iOS purchases
2013
1.4 million Android Apps
$ 5 billion Google Payout within 1 year
Distance Calculation Issues
480km biking in 1 hour!
Solution: Unit Test in Live App reports Geo
Calc Problems
Finding: Only happens on certain
Android versions
Bluetooth 4.0 Issue on AndroidOS Issue
crashing App
3rd Party Issues
Impact of bad 3rd party calls
Slow Network – Bad Latency
Impact of Latency and Bandwidth
Metrics: Crashes, Exceptions, # and Status of 3rd Party Calls, Payload of
Web Service Calls
Dev: Build for Mobile
Test: Test on Mobile and Diff. Carriers
Ops: Monitor Mobile
#Push without a Plan
434 Resources in total on that page:230 JPEGs, 75 PNGs, 50 GIFs, …
Total size of ~ 20MB
Mobile Landing Page of Super Bowl Ad
m.store.com redirects to www.store.com
ALL CSS and JS files are
redirected to the www domain
This is a lot of time “wasted” especially on high latency mobile
connections
Metrics: Load Time, # Resources (Images, …),
# HTTP 3xx, 4xx, 5xx
Dev: Build for Mobile
Test: Test on Mobile
Ops: Monitor Mobile
Architectural Decisions gone
Bad
We wanted Web 2.0 and Mobile Ready!
Metrics: # Visitors# Requests / User
Dev: Follow Best Practices
Test: Find realistic scenarios
“Blindly” (Re)use Existing
Components
Requirement: We need a report
Using Hibernate results in 4k+ SQL Statements to display 3 items!
Hibernate Executes 4k+ Statements
Individual Execution VERY FAST
But Total SUM takes 6s
Requirement: We need a fancy UI
Using Telerik Controls Results in 9s for Data-Binding of UI Controls
#1: Slow Stored ProcedureDepending on Request execution
time of this SP varies between 1 and 7.5s
#2: 240! Similar SQL StatementsMost of these 240! Statements are not
prepared and just differ in things like Column Names
Metrics: # Total SQLs# SQLs / Web Request# Same SQLs / Request
Transferred Rows
Test: With realistic Data
Dev: “Learn” Frameworks
#No “Agile” Deployment
Load Spike resulted in UnavailabilityAd
on
air
Alternative: “GoDaddy goes DevOps”
1h before SuperBowl KickOff
1h after Game ended
Behind the Scenes
Metrics: AvailabilityPage Size, # Objects
# Hosts, # Connections
DevOps: “Feature” Switches
# of Requests / User
# of Log Messages
# of Crashes
# Objects Allocated
# Objects In Cache
Cache Hit Ratio
# of Images
# of SQLs
# SQLs per RequestAvailability
# HTTP 3xx, 4xx
Page Size
A final thought …
How about this idea?
12 0 120ms
3 1 68ms
Build 20 testPurchase OK
testSearch OK
Build 17 testPurchase OK
testSearch OK
Build 18 testPurchase FAILED
testSearch OK
Build 19 testPurchase OK
testSearch OK
Build # Test Case Status # SQL # Excep CPU
12 0 120ms
3 1 68ms
12 5 60ms
3 1 68ms
75 0 230ms
3 1 68ms
Test Framework Results Architectural Data
We identified a regresesion
Problem solved
Let’s look behind the scenes
Exceptions probably reason for
failed testsProblem fixed but now we have an
architectural regression
Problem fixed but now we have an
architectural regressionNow we have the functional and
architectural confidence
How? Performance Focus in Test AutomationAnalyzing All Unit / Performance Tests
Analyze PerfMetrics
Identify Regressions
If we do all that
FREE Products & More Info
• Dynatrace Free Trial – http://bit.ly/dtrial– Full End-to-End Visibility in your Java, .NET, PHP Apps
– Sign up for a 30 Days (option for Lifetime) Free Trial on http://bit.ly/atd2014challenge
• Our Blog: http://blog.dynatrace.com
• My contact: @grabnerandi, agrabner@dynatrace.com
Bonus Bite(s)
Don’t ruin your reputation
Outdated Library causing Issues
Implementation Flaws
Business Impact requires Action!
Solution: Cache to the RESCUE!!
Implementation and Rollout
Implemented InMemory Cache
Worked well in Load Testing
Result: Out of Memory Crashes!!
Still crashes
Problem fixed!Fixed Version Deployed
Metrics: Heap Size, # Objects Allocated,# Objects in Cache
Cache Hit Ratio
Test: With realistic Data
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