Successful Scalability Principles - Part 1
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EffectiveMySQL.com - Performance, Scalability & Business Continuity
Successful Scalability Principles - Part 1
Ronald Bradfordhttp://ronaldbradford.com
2012.08
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EffectiveMySQL.com - Performance, Scalability & Business Continuity
OUTLINE
Necessary PrinciplesSystem ArchitectureData AvailabilityBest PracticesBeing proactive
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EffectiveMySQL.com - Performance, Scalability & Business Continuity11
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EffectiveMySQL.com - Performance, Scalability & Business Continuity
ACTION
Integrated monitoring and instrumentation1
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EffectiveMySQL.com - Performance, Scalability & Business Continuity
EXAMPLE
Question:
How do you know when your server is down or not accessible?
Answer:
The users will let us know.1✘
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EffectiveMySQL.com - Performance, Scalability & Business Continuity
HOW
1
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EffectiveMySQL.com - Performance, Scalability & Business Continuity
HOW
Monitoring/AlertingGraphicalHistoricalNecessaryGenerally missing/incompleteUseless for real-time analysis1
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EffectiveMySQL.com - Performance, Scalability & Business Continuity
HOW
Monitoring/AlertingGraphicalHistoricalNecessaryGenerally missing/incompleteUseless for real-time analysis1REACTIVE
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EffectiveMySQL.com - Performance, Scalability & Business Continuity
HOW
http://rb42.com/monitoring-needs1
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EffectiveMySQL.com - Performance, Scalability & Business Continuity
HOW
Dashboard
The state of NOW
Near real-time statistics
Sampling at 1s/3s/5s
e.g. 0.1% of throughput
http://rb42.com/monitoring-needs1
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EffectiveMySQL.com - Performance, Scalability & Business Continuity
HOW
Dashboard
The state of NOW
Near real-time statistics
Sampling at 1s/3s/5s
e.g. 0.1% of throughputPROACTIVE
http://rb42.com/monitoring-needs1
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EffectiveMySQL.com - Performance, Scalability & Business Continuity
HOW
11
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EffectiveMySQL.com - Performance, Scalability & Business Continuity
HOW
InstrumentationImportant to business viability
e.g. orders per minute (KPI)
page load time
Seamless implementationi.e. no code changes to view real-time
extensible 11
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EffectiveMySQL.com - Performance, Scalability & Business Continuity
HOW
InstrumentationImportant to business viability
e.g. orders per minute (KPI)
page load time
Seamless implementationi.e. no code changes to view real-time
extensible 11PROACTIVE
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EffectiveMySQL.com - Performance, Scalability & Business Continuity
Why
Monitoring + Instrumentation = Preemptive Analysis1
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EffectiveMySQL.com - Performance, Scalability & Business Continuity
How NOT TO
1✘
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EffectiveMySQL.com - Performance, Scalability & Business Continuity
HOW TO
1✔
< 1 second
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EffectiveMySQL.com - Performance, Scalability & Business Continuity
WHY
Preemptive Analysis
Fail early
Faster user response
Less physical resource impact1
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EffectiveMySQL.com - Performance, Scalability & Business Continuity
TIP
1
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EffectiveMySQL.com - Performance, Scalability & Business Continuity
TIP
Have a status website
allow for comments (e.g. blog)
1
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EffectiveMySQL.com - Performance, Scalability & Business Continuity
TIP
Have a status website
allow for comments (e.g. blog)
Have a public dashboard website1
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EffectiveMySQL.com - Performance, Scalability & Business Continuity
TIP
Have a status website
allow for comments (e.g. blog)
Have a public dashboard website
Host them somewhere else!1
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EffectiveMySQL.com - Performance, Scalability & Business Continuity
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EffectiveMySQL.com - Performance, Scalability & Business Continuity
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EffectiveMySQL.com - Performance, Scalability & Business Continuity
ACTION
Seamless automated
server deployment2
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EffectiveMySQL.com - Performance, Scalability & Business Continuity
EXAMPLE
Actual Client
100+ production database servers
Full-time DBAs
No automated software installation
No single documented installation process
No version control
No auditing/verification 2✘
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EffectiveMySQL.com - Performance, Scalability & Business Continuity
HOW
Basics
Version Control
Automated Build & Release
Integrated Monitoring2
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EffectiveMySQL.com - Performance, Scalability & Business Continuity
HOW
Intermediate
Health Checks
Runtime config file management
Benchmarking 2
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EffectiveMySQL.com - Performance, Scalability & Business Continuity
HOW
Advanced
Server request queue
Automated discovery
Proactive scaling (up & down)2
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EffectiveMySQL.com - Performance, Scalability & Business Continuity
GOAL
Consistent and timely provisioning
Unattended installation with correct and reproducible configuration
Automated discovery2✔
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EffectiveMySQL.com - Performance, Scalability & Business Continuity
ACTION
Disaster is
inevitable 3
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EffectiveMySQL.com - Performance, Scalability & Business Continuity
EXAMPLE
Question:Have you ever performed a database recovery?
Answer:No, why? 3
✘
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EffectiveMySQL.com - Performance, Scalability & Business Continuity
EXAMPLE
Consultant:Do you know that your daily backups only recover the data up to that time (e.g. 1 am). You know you have lost all your sales(aka $2 million sales today) and data changes since then.
Customer:No, I didn’t know that. 3
✘
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EffectiveMySQL.com - Performance, Scalability & Business Continuity
HOW
3
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EffectiveMySQL.com - Performance, Scalability & Business Continuity
HOW
Have a DR plan
3
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EffectiveMySQL.com - Performance, Scalability & Business Continuity
HOW
Have a DR plan
Documented
3
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EffectiveMySQL.com - Performance, Scalability & Business Continuity
HOW
Have a DR plan
Documented
Tested 3
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EffectiveMySQL.com - Performance, Scalability & Business Continuity
HOW
Have a DR plan
Documented
Tested
Timed 3
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EffectiveMySQL.com - Performance, Scalability & Business Continuity
HOW
Have a DR plan
Documented
Tested
Timed
Verified 3
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EffectiveMySQL.com - Performance, Scalability & Business Continuity
HOW
3
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EffectiveMySQL.com - Performance, Scalability & Business Continuity
HOW
Test under production conditions
3
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EffectiveMySQL.com - Performance, Scalability & Business Continuity
HOW
Test under production conditions
System Load
3
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EffectiveMySQL.com - Performance, Scalability & Business Continuity
HOW
Test under production conditions
System Load
Database Size 3
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EffectiveMySQL.com - Performance, Scalability & Business Continuity
HOW
Test under production conditions
System Load
Database Size
End to End 3
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EffectiveMySQL.com - Performance, Scalability & Business Continuity
GOAL
Know and practice for disaster
Provide confidence to management
Be as confident about your recovery as your scalability3✔
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EffectiveMySQL.com - Performance, Scalability & Business Continuity
SIDEBAR!
What does your website look like when it’s down?3
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EffectiveMySQL.com - Performance, Scalability & Business Continuity
SIDEBAR
3Google Picasa
✘
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EffectiveMySQL.com - Performance, Scalability & Business Continuity
SIDEBAR
3✘
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EffectiveMySQL.com - Performance, Scalability & Business Continuity
SIDEBAR
3Mozilla
✘
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EffectiveMySQL.com - Performance, Scalability & Business Continuity
SIDEBAR
3✔
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EffectiveMySQL.com - Performance, Scalability & Business Continuity
SIDEBAR
3✔
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EffectiveMySQL.com - Performance, Scalability & Business Continuity
ACTION
ApplicationProgramming
Interface4
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EffectiveMySQL.com - Performance, Scalability & Business Continuity
EXAMPLE
3 access paths to same data with different business rules
Public APIApplication web siteBatch processes 4
✘
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EffectiveMySQL.com - Performance, Scalability & Business Continuity
WHY an API?
One code path for business functionality
Implied business documentation
Enforced data exchange standard
Testability 4
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EffectiveMySQL.com - Performance, Scalability & Business Continuity
GOAL
Technology independence
Business specification dependence (API)
Stress testable 4✔
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EffectiveMySQL.com - Performance, Scalability & Business Continuity
REQUIREMENTS
Input Specification
Output Specification
Standard for data communication
Throughput needs
Latency requirements
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EffectiveMySQL.com - Performance, Scalability & Business Continuity
SIDEBAR!
Testing is not about what works, it’s about breaking your software4
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EffectiveMySQL.com - Performance, Scalability & Business Continuity
ACTION
Support different levels of data
availability5
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EffectiveMySQL.com - Performance, Scalability & Business Continuity
HOW
5
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EffectiveMySQL.com - Performance, Scalability & Business Continuity
HOW
Data can be:
5
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EffectiveMySQL.com - Performance, Scalability & Business Continuity
HOW
Data can be:
Read & Write
5
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EffectiveMySQL.com - Performance, Scalability & Business Continuity
HOW
Data can be:
Read & Write
Read 5
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EffectiveMySQL.com - Performance, Scalability & Business Continuity
HOW
Data can be:
Read & Write
Read
Cached 5
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EffectiveMySQL.com - Performance, Scalability & Business Continuity
HOW
Data can be:
Read & Write
Read
Cached
No Access 5
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EffectiveMySQL.com - Performance, Scalability & Business Continuity
EXAMPLE
Development Team:
We need a maintenance window for software
upgrades and new releases.5
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EffectiveMySQL.com - Performance, Scalability & Business Continuity
EXAMPLE
Management Team:
No Downtime5
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EffectiveMySQL.com - Performance, Scalability & Business Continuity
EXAMPLE
Development Team:
But we need this to fix problems and improve
performance. 5
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EffectiveMySQL.com - Performance, Scalability & Business Continuity
EXAMPLE
Management Team:
No Downtime5
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EffectiveMySQL.com - Performance, Scalability & Business Continuity
EXAMPLE
What is your definition of no
downtime?5
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EffectiveMySQL.com - Performance, Scalability & Business Continuity
WHY
Support downtime
Software upgrades
Support disasters
Reduce high load
Support partial functionality5
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EffectiveMySQL.com - Performance, Scalability & Business Continuity
GOAL
Meet the business needs of availability
There are ways to give greater perception of availability5
✔
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EffectiveMySQL.com - Performance, Scalability & Business Continuity
ACTION
Support different scalability principles6
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EffectiveMySQL.com - Performance, Scalability & Business Continuity
HOW
Read Scalability
Write Scalability
Caching 6
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EffectiveMySQL.com - Performance, Scalability & Business Continuity
HOW
Depends on your R/W ratio
Depends on your business needs
Depends on rate of data change (caching) 6
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EffectiveMySQL.com - Performance, Scalability & Business Continuity
ISSUES
Consistency
Data Interoperability
6
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EffectiveMySQL.com - Performance, Scalability & Business Continuity
GOAL
Support large scale growth with appropriate software architecture
Minimize human interaction
Ongoing review and improvement6✔
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EffectiveMySQL.com - Performance, Scalability & Business Continuity
SIDEBAR!
6Availability options & scalability principles = scalable datastore
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EffectiveMySQL.com - Performance, Scalability & Business Continuity++
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EffectiveMySQL.com - Performance, Scalability & Business Continuity
WHAT's NEXT
I only had one hour!+
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EffectiveMySQL.com - Performance, Scalability & Business Continuity
WHAT's NEXT
+Part 2
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EffectiveMySQL.com - Performance, Scalability & Business Continuity
WHAT's NEXT
Reduce deployment time
The right business metrics
Team dynamics
Managing risk
Continual improvement
Data interoperability
... +Part 2
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EffectiveMySQL.com - Performance, Scalability & Business Continuity
WHAT's NEXT
Reduce deployment time
The right business metrics
Team dynamics
Managing risk
Continual improvement
Data interoperability
... +AsynchronousWrite once dataConsistency
Part 2
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EffectiveMySQL.com - Performance, Scalability & Business Continuity
CC
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EffectiveMySQL.com - Performance, Scalability & Business Continuity
CONCLUsION
Monitoring. Before, during and after NOW.
You may not be able to predict the future but you can preempt the future.
Operate below 90%. That 10% is your insurance policy. Invest in insurance.C
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EffectiveMySQL.com - Performance, Scalability & Business Continuity
CONCLUSION
Does your business exist without your data?
How long can your site be unavailable before customers go elsewhere?
C
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EffectiveMySQL.com - Performance, Scalability & Business Continuity
CONCLUSION
Support 3 levels of real time data accessRead/Write, Read and no access
Support 3 different aspects of scalabilityRead, Write and CachingC
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EffectiveMySQL.com - Performance, Scalability & Business Continuity
REFERENCE
Presentation
The most common MySQL scalability mistakes, and how to avoid them.@
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EffectiveMySQL.com - Performance, Scalability & Business Continuity
REFERENCE
1. My website is slow?
2. I want to add new H/W. How do I change my application to support this?
3. The database is slow. My webpage takes five seconds to load.
4. Why is my database executing so many qps?
5. My server has crashed with a hard drive failure
6. My replication slave can't keep up?
7. I can't access my website?
8. 8. Why is my database so large?
9. My website seems to freeze or responds randomly?@
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EffectiveMySQL.com - Performance, Scalability & Business Continuityhttp://effectiveMySQL.comRonald Bradford