NoSQL matters 2012: http://2012.nosql-matters.org/bcn/speakers/#david_arcos
Catchoom is a technology startup founded in 2011 in Barcelona. Our platform provides visual recognition as a service, it's designed for applications that need to search through a database of images. Catchoom is empowering leading Augmented Reality companies like Layar and Metaio with scalable and fast visual search.
This presentation will explain the architecture of the Catchoom Platform, emphasizing on the advantages of using NoSQL for the specific requirements of visual recognition.
1) Introduction
- David Arcos
- Catchoom
- Customers
- Visual Recognition
- Examples
- Catchoom Recognition Service
- Team
2) What did we need?
- Minimum requirements
- Flexible
- Reliable
- Fast
3) How we build it
- Technology stack
- The Panel
- Mobile apps
- Data models
- Components
- NoSQL features
4) Advantages of NoSQL
- Performance
- Scalability
- Unstructured data: query
- Unstructured data: metadata
- Availability
5) Cool uses of NoSQL
- Real time calculations (stats, monitoring, rate limiting)
- Sorted sets (indexing)
- Cache
- Volatile data
- Messages (pub/sub, push/pop)
6) Limits
- Django apps compatibility
7) Conclusion
- Summary
- Recommendations
- Thanks for attending
- Q&A
http://catchoom.com
Cloud Frontiers: A Deep Dive into Serverless Spatial Data and FME
NoSQL matters in Catchoom Recognition Service
1. NoSQL matters in Catchoom Recognition Service
David Arcos http://catchoom.com
catchoom.com | @catchoom
2. NoSQL matters in Recognition Service
1) Introduction
2) What did we need?
3) How we build it
4) Advantages of NoSQL
5) Cool uses of NoSQL
6) Limits
7) Conclusion
David Arcos | @DZPM Catchoom | http://catchoom.com | @catchoom
3. NoSQL matters in Recognition Service
Hi! I'm David Arcos
- Python/Django developer (>4yr)
- Web backend, distributed systems,
databases, scalability, security
- Team leader at Catchoom
- You can follow me at @DZPM
David Arcos | @DZPM Catchoom | http://catchoom.com | @catchoom
4. NoSQL matters in Recognition Service
Catchoom technology recognizes an
object by searching through a large
collection of images in a fraction of a
second.
Catchoom targets application
developers and integrators.
David Arcos | @DZPM Catchoom | http://catchoom.com | @catchoom
5. NoSQL matters in Recognition Service
Our customers are leaders in Augmented Reality
David Arcos | @DZPM Catchoom | http://catchoom.com | @catchoom
6. NoSQL matters in Recognition Service
Visual Recognition:
“Identify an object in front of the camera by comparing it
to a huge collection of reference images”
David Arcos | @DZPM Catchoom | http://catchoom.com | @catchoom
7. NoSQL matters in Recognition Service
Examples of recognized objects:
- CD/DVD and book covers
- Newspapers and magazines
- Logos and brands
- Posters
- Packaged goods
- Monuments and places
David Arcos | @DZPM Catchoom | http://catchoom.com | @catchoom
8. NoSQL matters in Recognition Service
Catchoom Recognition Service:
- Cloud-based Visual Recognition (SaaS)
- RESTful API to integrate
- “Add VR features to your app/platform”
David Arcos | @DZPM Catchoom | http://catchoom.com | @catchoom
9. NoSQL matters in Recognition Service
- Small team of 4 developers, doing SCRUM
David Arcos | @DZPM Catchoom | http://catchoom.com | @catchoom
10. NoSQL matters in Recognition Service
1) Introduction
2) What did we need?
3) How we build it
4) Advantages of NoSQL
5) Cool uses of NoSQL
6) Limits
7) Conclusion
David Arcos | @DZPM Catchoom | http://catchoom.com | @catchoom
11. NoSQL matters in Recognition Service
Minimum requirements:
- a public API for the final users to perform Visual
Recognition
- a private API for the customer to manage the
Collections and get statistics
- a nice website for the customer, providing the
functionality of both APIs
David Arcos | @DZPM Catchoom | http://catchoom.com | @catchoom
12. NoSQL matters in Recognition Service
Must be flexible:
- A customer who does Augmented Reality, and
needs a 3D model (binary format) in the item
- Another one who needs just the item id
- Our data model needs to allow everything
(structured and unstructured data)
David Arcos | @DZPM Catchoom | http://catchoom.com | @catchoom
13. NoSQL matters in Recognition Service
Must be reliable:
- Images or data should never be lost
- Avoid single points of failure
- We need redundancy
David Arcos | @DZPM Catchoom | http://catchoom.com | @catchoom
14. NoSQL matters in Recognition Service
Must be very fast:
“Layar has been using Catchoom’s Visual Search technology since the
launch of Layar Vision, allowing users to quickly view the AR content placed
on top of images by just pointing their camera to the image.
We’ve benchmarked Catchoom’s technology in 2011 against 3 of their main
competitors and found they had the best results both on speed and on
successful matches (including lowest false positives)”
Dirk Groten – CTO of Layar
David Arcos | @DZPM Catchoom | http://catchoom.com | @catchoom
15. NoSQL matters in Recognition Service
1) Introduction
2) What did we need?
3) How we build it
4) Advantages of NoSQL
5) Cool uses of NoSQL
6) Limits
7) Conclusion
David Arcos | @DZPM Catchoom | http://catchoom.com | @catchoom
17. NoSQL matters in Recognition Service
The Panel:
- typical customer portal:
- manage your Collections, run Visual Recognition
- get usage statistics
- and configure the payment method :)
David Arcos | @DZPM Catchoom | http://catchoom.com | @catchoom
18. NoSQL matters in Recognition Service
David Arcos | @DZPM Catchoom | http://catchoom.com | @catchoom
19. NoSQL matters in Recognition Service
David Arcos | @DZPM Catchoom | http://catchoom.com | @catchoom
20. NoSQL matters in Recognition Service
Mobile apps:
- for Android, iOS
- use the Visual Recognition API
- the code will be published
David Arcos | @DZPM Catchoom | http://catchoom.com | @catchoom
21. NoSQL matters in Recognition Service
Data models:
- Collection: a set of items. Has at least one token.
- Item: has at least one Image. Has metadata.
- Image: you want several images if the item has different
sides, logos, flavours...
- Token: for authenticating the requests.
David Arcos | @DZPM Catchoom | http://catchoom.com | @catchoom
22. NoSQL matters in Recognition Service
Components:
- the platform is highly modular
- “Do one thing, and do it well”
- they pass json messages
- optimized hardware settings
David Arcos | @DZPM Catchoom | http://catchoom.com | @catchoom
23. NoSQL matters in Recognition Service
- Frontend:
gets the API request
- Extractor:
extracts the visual points
- Collector:
message exchange
- Searcher:
looks for matches
David Arcos | @DZPM Catchoom | http://catchoom.com | @catchoom
24. NoSQL matters in Recognition Service
Required NoSQL features:
- key-value storage
- cache
- message lists
- message pub/sub
- real-time analysis
What servers have we chosen?
David Arcos | @DZPM Catchoom | http://catchoom.com | @catchoom
26. NoSQL matters in Recognition Service
Required NoSQL features:
- key-value storage
- cache
- message lists
- message pub/sub
- real-time analysis
- and Filesystem:
David Arcos | @DZPM Catchoom | http://catchoom.com | @catchoom
27. NoSQL matters in Recognition Service
1) Introduction
2) What did we need?
3) How we build it
4) Advantages of NoSQL
5) Cool uses of NoSQL
6) Limits
7) Conclusion
David Arcos | @DZPM Catchoom | http://catchoom.com | @catchoom
28. NoSQL matters in Recognition Service
Performance:
- Can't afford writing to disk, or querying slow databases
- Using Redis, everything stays on memory
- One V.R. query takes just 300 ms
David Arcos | @DZPM Catchoom | http://catchoom.com | @catchoom
29. NoSQL matters in Recognition Service
Scalability:
- Need to scale different components, separately
- Load balancing using Redis Lists:
BLPOP: Remove and get
the first element in a list,
or block until one is available
- But focus on the bottlenecks!
David Arcos | @DZPM Catchoom | http://catchoom.com | @catchoom
30. NoSQL matters in Recognition Service
Unstructured data: query
- A query object has many optional parameters
- each component can add/remove fields dynamically
- schema change between versions
- Can't fit in a SQL table
- We model the query in Redis as a json
David Arcos | @DZPM Catchoom | http://catchoom.com | @catchoom
31. NoSQL matters in Recognition Service
Unstructured data: metadata
- Metadata is optional and unstructed, can be from a json to a
binary blob
- Can't fit in a SQL table, and would be too slow
- Serve the data from Redis, and use S3 as a backup
- Warning: in the future, if we have huge metadata files,
Redis will get out of memory. We'll improve this approach
David Arcos | @DZPM Catchoom | http://catchoom.com | @catchoom
32. NoSQL matters in Recognition Service
Availability:
- Avoid single points of failure. Replicate everything!
- Replicating a SQL server is painful
- Redis instances configured as Master/Slave
- When the master dies:
- promote a slave to be the new master
- reconfigure the other slaves to use this new master
- Redis Sentinel does this (beta)
David Arcos | @DZPM Catchoom | http://catchoom.com | @catchoom
33. NoSQL matters in Recognition Service
1) Introduction
2) What did we need?
3) How we build it
4) Advantages of NoSQL
5) Cool uses of NoSQL
6) Limits
7) Conclusion
David Arcos | @DZPM Catchoom | http://catchoom.com | @catchoom
34. NoSQL matters in Recognition Service
Do real-time calculations:
- Usage statistics
- total, monthly, daily, hourly
- per image, item or collection
- Metric monitoring for internal use
- response times, queue size, etc
- QoS: enforce rate limiting
- max hits per minute
David Arcos | @DZPM Catchoom | http://catchoom.com | @catchoom
35. NoSQL matters in Recognition Service
Sorted Sets:
- To create indexes and filters
- In example, “Most recognized images” (sorted by hits)
- Updating the Sorted Set, no need to reconsolidate:
ZADD Add one or more members to a sorted set,
or update its score if it already exists
David Arcos | @DZPM Catchoom | http://catchoom.com | @catchoom
36. NoSQL matters in Recognition Service
Cache:
- Redis is compatible with memcached API
- Cache everything:
- Sessions, metadata, etc
- ...although the website is internal: no bottleneck here
- Better focus on optimizing other stuff!
David Arcos | @DZPM Catchoom | http://catchoom.com | @catchoom
37. NoSQL matters in Recognition Service
Volatile data:
- Redis can set an expiration time for a value
- Very easy for:
- implementing timeouts
- removing old queries
- adding temporary capping
David Arcos | @DZPM Catchoom | http://catchoom.com | @catchoom
38. NoSQL matters in Recognition Service
Messages:
- Redis implements pub/sub and lists.
- Publish/Subscribe to a channel
- all components get the message
- use it for monitoring
- List: push/pop messages
- only one component gets the message
- use the blocking versions for load balancing
David Arcos | @DZPM Catchoom | http://catchoom.com | @catchoom
39. NoSQL matters in Recognition Service
1) Introduction
2) What did we need?
3) How we build it
4) Advantages of NoSQL
5) Cool uses of NoSQL
6) Limits
7) Conclusion
David Arcos | @DZPM Catchoom | http://catchoom.com | @catchoom
40. NoSQL matters in Recognition Service
Django apps compatibility:
- we use Django and several contrib and external apps.
- (“Standing in the shoulder of giants”)
- but no support for NoSQL in Django ORM
- dropping SQL is not an option!
- we use MySQL. South migrations.
David Arcos | @DZPM Catchoom | http://catchoom.com | @catchoom
41. NoSQL matters in Recognition Service
1) Introduction
2) What did we need?
3) How we build it
4) Advantages of NoSQL
5) Cool uses of NoSQL
6) Limits
7) Conclusion
David Arcos | @DZPM Catchoom | http://catchoom.com | @catchoom
42. NoSQL matters in Recognition Service
Summary:
- We use a combination of SQL and NoSQL
- Using NoSQL was necessary to meet the requirements
- There are a lot of different uses for NoSQL
David Arcos | @DZPM Catchoom | http://catchoom.com | @catchoom
43. NoSQL matters in Recognition Service
Recommendations:
- There is no silver bullet
- Use the best tool for each task
- But avoid unneeded complexity!
- Try Redis. Don't do a migration, just add it to your stack
David Arcos | @DZPM Catchoom | http://catchoom.com | @catchoom
44. NoSQL matters in Recognition Service
Thanks for attending!
- Our beta will be ready soon.
Get a free trial at http://catchoom.com
- Contact me at
david.arcos@catchoom.com
- Questions?
David Arcos | @DZPM Catchoom | http://catchoom.com | @catchoom
46. NoSQL matters in Recognition Service
Thanks for attending!
- Our beta will be ready soon.
Get a free trial at http://catchoom.com
- Contact me at
david.arcos@catchoom.com
- Questions?
David Arcos | @DZPM Catchoom | http://catchoom.com | @catchoom
Notas do Editor
Looks easy?
(timestamps, the image index, debug info...)
Efficiency Totals, per month, per day, per image, per item, per collection Response times, queue size Redis is compatible with memcached API Avoid hitting the db