CouchDB to the Edge ApacheCon EU
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The document discusses deploying CouchDB to the edge by running local CouchDB nodes at user endpoints. It describes CouchDB basics like its document-oriented and JSON-based data structure. Key points include sharing application code and data through design documents and replication; deployment options like traditional servers, offline mode, and peer-to-peer; and programming at the edge through JavaScript map/reduce functions and caching rendered content. Security challenges like identity and trust when data passes through intermediate servers are also addressed.
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CouchDB to the Edge ApacheCon EU
- 1. Deploying to the Edge Apache CouchDB Friday, 27 March 2009
- 2. Relax Friday, 27 March 2009
- 3. Who’s Talking? • J Chris Anderson / jchris@apache.org / @jchris • PHP -> Rails -> JSON -> CouchDB • Director, couch.io Friday, 27 March 2009
- 4. And You? • Web developers? • JavaScript coders? • CouchDB users? Friday, 27 March 2009
- 5. CouchDB at the Edge • CouchDB Basics • Design Documents • View Source ➙ Open Source • Deployment • Application Constraints Friday, 27 March 2009
- 6. Damien Katz Wassat? Friday, 27 March 2009 What’s CouchDB?
- 7. Schema Free (JSON) • CouchDB • Document Oriented, Not Relational • Highly Concurrent • RESTful HTTP API • JavaScript Powered Map/Reduce • N-Master Replication • Robust Storage Friday, 27 March 2009
- 8. RESTful HTTP • Binary attachments • JSON is ideal for Ajax • Web Native • Standalone Applications Friday, 27 March 2009
- 9. Design Documents • Application Code • JSON Documents • Share • couchapp clone • Replication Friday, 27 March 2009
- 10. Design Documents • Application Code • JSON Documents • Share • couchapp clone • Replication Friday, 27 March 2009
- 11. Design Documents • Application Code • JSON Documents • Share • couchapp clone • Replication Friday, 27 March 2009
- 12. Design Documents • Application Code • JSON Documents • Share • couchapp clone • Replication Friday, 27 March 2009
- 13. View Source ➙ Open Source • “Running at the Edge” when users run local CouchDB nodes. • Applications are data. • Give control to users. CC-BY-SA http://www.flickr.com/photos/kelleys/492253912/ Friday, 27 March 2009
- 14. Easy to Share • Design Docs are replicated. • If you can see an application, you can have the code. Friday, 27 March 2009
- 15. Oooh... Replication Friday, 27 March 2009
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- 22. Friday, 27 March 2009 periodic, notifier system
- 23. Friday, 27 March 2009
- 24. Friday, 27 March 2009 P2P apps
- 25. Deployment • Traditional Server • couchapp push • Replicated to User • offline-mode • Peer to Peer • Ad hoc sharing Friday, 27 March 2009
- 26. Traditional Server • We’re familiar with the application model. • We know we can scale CouchDB. • Centralized servers are hard to run. • Users expect low latency responses. • Peak traffic events are interesting. Friday, 27 March 2009
- 27. Offline Mode • Application model is more like a desktop. • Code runs primarily at the client. • Replication keeps the edge in sync with the cloud. • Latency is less important than throughput. Friday, 27 March 2009
- 28. Peer to Peer • Needs no primary service provider. • Users can mashup apps and data. • Generative because people own the code. • We’re still learning application models. Friday, 27 March 2009
- 29. Friday, 27 March 2009 P2P apps
- 30. Programming at the Edge Friday, 27 March 2009
- 31. More than Ajax Friday, 27 March 2009 • Side Effect Free JavaScript Function • Converts from a single document into a response with any Content-Type • CouchApp makes it easy to use http://embeddedjs.com templates in your _show functions. • Cacheable with Etags
- 32. Render JSON Docs as HTML shows/post.js /drl/_show/sofa/post/Hello-World-For-Real-This-Time Friday, 27 March 2009 • Side Effect Free JavaScript Function • Converts from a single document into a response with any Content-Type • CouchApp makes it easy to use http://embeddedjs.com templates in your _show functions. • Cacheable with Etags
- 33. Render Views as HTML lists/index.js /drl/_list/sofa/index/recent-posts?descending=true&limit=8 Friday, 27 March 2009 • Side effect free and cacheable, like _show • Run with different parameters for the head, tail, and each individual row of the view.
- 34. Context is Expensive • Validate one document. • Render requests have no side effects. • Limited to a single document or view. • Document updates trigger asynchronous processing. Friday, 27 March 2009
- 35. Identity • Can we trust intermediate servers? • Key-Based Identity • Signed Messages • Canonical JSON • Web of Trust Friday, 27 March 2009
- 36. Where do I start? • @CouchDB on Twitter • http://couchdb.org/ • http://planet.couchdb.org/ • http://books.couchdb.org/relax/ • http://groups.google.com/group/couchapp Friday, 27 March 2009
- 37. couch.io Berlin – London – Portland Friday, 27 March 2009
- 38. anks! Friday, 27 March 2009
- 39. Friday, 27 March 2009