delaying gratification: using queues to build efficient systems
TRANSCRIPT
Delaying GratificationUsing queues to build efficient systems
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Tom Lodge
Senior Magento eCommerce Architect Magento [email protected]
Kevin Schroeder
Technical Manager of Education and Consulting
Magento ECG, MagentoU
@kpschrade
Business Case1
Welcome to BillyBobBBQs.com
• BillyBobBBQs.com• Sell BBQs• Sell a LOT of BBQs
The Board Expects
• Optimal Customer Experience• Maximise Sales• Minimise Costs
Simple stuff
• Payment Gateway• ERP Integration• Third Party Systems
Marketing promotes success
• BillyBobBBQs.com have a great PR team• PR aren’t always able to predict success• Chairman on Good Morning America
Success can be a problem
• Site designed for a volume of traffic• Chairman just invited USA to visit• Site needs to scale • Max Sales, Min Cost
OK so what next…
• Maintain Customer Experience• Maximise Sales• Minimise Costs• Handle Spikes
Thinking About The Problem2
How we (like to) think about scaling
1 6 11 16 21 26 31 36 41 46 51 56 61 66 71 76 81 86 91 960
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2
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0
50
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Capacity
Traffic
Billy Bob’s scaling experience
1 4 7 10 13 16 19 22 25 28 31 34 37 40 43 46 49 52
Solution: Cloud
Server
Server
Timeline
Two Problems
1: Clouds still like predictability
Throughput
Capacity
2: We’ve only scaled web nodes
Server
Server
Server
Server
Server
Server
Server
Database
What does Billy Bob need?
A system that can temporarily manage peaks that are beyond the synchronous capacity of the system
while retaining functionality and responsiveness
In other words we are talking about scalability not performance
Defining A Solution3
Requirements
• MUST handle spikes without interfering with the customer
• MUST mitigate spikes without overwhelming the infrastructure
• MUST be able to use resources efficiently
Billy Bob needs a system like this
Throughput
Capacity
Options
Batching Queuing
Difference between batch and queue
Batch Queue
Difference between batch and queue
Batch Queue
Difference between batch and queue
Batch Queue
The Effect on Infrastructure
Batch Queue
0%
10%
20%
30%
40%
50%
60%
70%
80%
90%
100%
wa
id
sy
us
0%
10%
20%
30%
40%
50%
60%
70%
80%
90%
100%
wa
id
sy
us
Batching QueuingQu
Implementing A Solution4
Front End Node
Worker Queue
Basic Work Flow
MUST handle spikes without interfering with the customer
MUST be able to use resources efficiently
MUST mitigate spikes without overwhelming the infrastructure
Uni-Directional Job
Executed On The Frontend
Executed On The BackendUnit Testing Entry Point
Eg. 1 – Uni-Directional5
Bi-Directional Job
Executed In The Future
Bi-Directional Result Tickets
Get a result ticket
Job is returned when it has finished executing
Eg.2 – Bi-DirectionalBlocking/Non-Blocking
6
Integration with Magento7
How can Billy Bob use this?
1. Initiate jobs at controller_action_predispatch for consumption during
block rendering
2. Execute multiple concurrent data requests from web services
3. Initiate data retrieval for retrieval in subsequent Ajax requests
4. Implement an ordering mechanism that throttles order processing
(beware of PCI issues here, obviously)
5. Update ERP systems immediately with no client interruption
6. Ideas?
https://github.com/kschroeder/Magento-Worker-Queue_POC
Questions9
Thanks
Tom LodgeSenior Magento eCommerce Architect
Magento ECG
Kevin SchroederTechnical Manager of Education and Consulting
Magento ECG, MagentoU
@kpschrade