Rolling With Riak
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The document provides an overview of NoSQL databases and focuses on MongoDB and Riak. It discusses how these databases address the needs of web applications by providing flexibility, scalability, and high performance. Riak is highlighted as using a distributed architecture with no single point of failure and tunable consistency properties. Its ability to link documents and handle high availability through replication is also summarized.
![(Yet-Another-NoSQL-DB) Presented By John Lynch [email_address]](https://image.slidesharecdn.com/rollingwithriak-100601114602-phpapp01/85/Rolling-With-Riak-1-320.jpg)
![Map/Reduce Map steps run on each node Final reduce runs on single node results = Riak::MapReduce.new(client). add(“albums”). map("function(v){ return [JSON.parse(v.values[0].data).title]; }", :keep => true).run](https://image.slidesharecdn.com/rollingwithriak-100601114602-phpapp01/85/Rolling-With-Riak-20-320.jpg)
Rolling With Riak
- 1. (Yet-Another-NoSQL-DB) Presented By John Lynch [email_address]
- 2. Web App Developers ORM Focus on the App Speed of Development DB Agnostic(ish) Fixed Schema Limits design choices Migration Hell Scaling at DB layer Rails!
- 3. Shiny New Toys Decades of research and best practices Awesome ad-hoc query capability Zillions of vendors/tools/libraries/code Flexibility of schema-less design Ability to scale…. Web-scale
- 4. Web Scale Changing App Types Social Games Marketing / Advertising Freemium Business Models 1M free => 10K paying customers
- 5. NoSQL Landscape Pure Key/Value (Redis/Tokyo Cabinet/etc) Key/Value+ (CouchDB/MongoDB/Riak) BigTable Type (Hbase, HyperTable) Choose wisely! No standard API. (Good general overview can be found here: http://cattell.net/datastores/Datastores.pdf)
- 6. MongoDB Popular with Ruby community Combines Key/Value with ability to do Indexed Queries
- 7. Scaling MongoDB Master, Slave, Replica Set, Replica Pair, Shard Server, Connection Pool, ack!
- 8. Scaling MongoDB
- 9. If all you want is NoSQL… NoSQL on MySQL Leverages all MySQL skills, tools, techniques, stability, dependability If you want NoSQL + Scalability… … not so much.
- 10. Riak Developed by Basho.com Used on several large production sites Written in Erlang Distributed – Fault Tolerant Buckets – Keys – Values Values can be anything (json,binary,etc) Ruby & Rails Client (Ripple project @ Github)
- 11. Riak speaks HTTP > curl –i http://host:8098/riak/bucket1/key1 HTTP/1.1 200 OK X-Riak-Vclock: awpcFAA== Content-Type: text/plain Content-Length: 9 Last-Modified: Wed, 01 Se… Etag: 45364657 I am a value Leverage existing HTTP infrastructure, tools, etc
- 12. Scaling Riak Riak Riak Riak Riak Riak Http Load Balancer Varnish (cache) Standard HTTP Protocol Rails Rails Rails Rails Rails
- 13. Scaling Riak (alt) Riak Rails Nginx Riak Rails Nginx Riak Rails Nginx Riak Rails Nginx Riak Rails Nginx Http Load Balancer Varnish (cache) Standard HTTP Protocol
- 14. Key Differentiator - Distributed Inspired by Amazon’s Dynamo Uses consistent hashing algorithim No “Master Node” No single point of failure Any node can service any request Automatically rebalances as nodes join Tunable CAP Properties Consistency, Availability, Partition Tolerance
- 15. N R W N = # of copies of the data R = # of nodes necessary to read W = # of nodes necessary to write Tunable by the application, on a per-bucket and per-query basis
- 16. Low Value Data (N=2 R=1 W=1) Logging Web Content (N=4 R=1 W=4) Maximum availability and consistency Financial Data (N=4 R=1 W=4 DW=4) DW is “Durable Write” Riak cluster of 4 Physical Computers
- 17. Network Split
- 18. Network Split
- 19. Network Split
- 20. Map/Reduce Map steps run on each node Final reduce runs on single node results = Riak::MapReduce.new(client). add(“albums”). map("function(v){ return [JSON.parse(v.values[0].data).title]; }", :keep => true).run
- 21. Links Riak documents can have links to other documents, each link can be “tagged” Link data is separate from doc data Easy URL access to walk these links GET /riak/artists/TheBeatles/albums,_,_/tracks,_,1
- 22. When NOT to use Riak Single machine Small scale or bog-standard apps Need rich ad-hoc indexed queries Need mature tools and libraries
- 23. Any questions? (First round at Rock Bottom generously sponsored by Basho.com)