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![JSON Documents { "_id": "BCCD12CBB", Schema Free "_rev": "1-AB764C", "type": "person", "name": "Darth Vader", Self-Contained "age": 63, "headware": ["Helmet", "Sombrero"], JavaScript Map } "dark_side": true Reduce Views](https://image.slidesharecdn.com/couchdb-osbridge-090619160405-phpapp02/75/CouchDB-Open-Source-Bridge-12-2048.jpg)
Uploaded byChris Anderson
CouchDB Open Source Bridge
This document summarizes a presentation about Apache CouchDB. Some key points: - CouchDB is a scalable, distributed key-value database that uses peer-to-peer replication. It has an append-only file structure and is designed to handle crashes well. - Data is stored in JSON documents with dynamic schemas. Views are built using JavaScript map-reduce functions. - The API is RESTful HTTP and works natively with the web. Data can be queried and rendered directly in the browser using JavaScript. - CouchDB embraces web technologies and can scale from smartphones to server clusters. It is open source and embraces an open philosophy.
CouchDB Open Source Bridge
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- 3. Hello • J Chris Anderson • Apache CouchDB committer • Web programmer (Rails, Ajax, etc) • Director, couch.io
- 4. About You? • Web developers are easy • Scalable key/value store • Peer-based Replication • Append-only IO pattern
- 5. Scaling Up • Hot. Literally. • You don’t have to think.
- 6. X Scaling Up • Hot. Literally. • You don’t have to think.
- 7. Scale Enforces Constraints • Distributed key / value stores • Context is expensive • No joins or autoincrement • Eventual consistency
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- 9. Why CouchDB? Native tothe Web Scale from a cluster to a smartphone Local data == low latency Replicated applications - the p2p web
- 10. Of the Web Let me tell you something: Django may be built for the Web, but CouchDB is built of the Web. I've never seen software that so completely embraces the philosophies behind HTTP. ... this is what the software of the future looks like. Jacob Kaplan-Moss October 19, 2007 http://jacobian.org/writing/of-the-web/
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- 12. JSON Documents { "_id": "BCCD12CBB", Schema Free "_rev": "1-AB764C", "type": "person", "name": "Darth Vader", Self-Contained "age": 63, "headware": ["Helmet", "Sombrero"], JavaScript Map } "dark_side": true Reduce Views
- 13. Map Reduce Views Docs { “user” : “Chris”, Map { “key” : “Alice”, “value” : 5 } “points” : 3 } { “key” : “Bob”, “value” : 7 } { “user” : “Joe”, function(doc) { { “key” : “Chris”, “value” : 3 } “points” : 10 } if (doc.user && doc.points) { { “key” : “Joe”, “value” : 10 } { “user” : “Alice”, emit(doc.user, doc.points); { “key” : “Mary”, “value” : 9 } “points” : 5 } } { “user” : “Mary”, } “points” : 9 } { “user” : “Bob”, Reduce “points” : 7 } Alice ... Chris: 15 function(keys, values, rereduce) { Everyone: 34 return sum(values); }
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- 16. ful You alreadyknow the API Use existing HTTP tools Talk directly to the browser
- 17. ful CRUD • Create HTTP PUT /db/mydocid • Read HTTP GET /db/mydocid • Update HTTP PUT /db/mydocid • Delete HTTP DELETE /db/mydocid
- 18. Local Data Low latency(fast) Peer-based incremental replication View source --> Open source
- 19. Gives Control toUsers CC-BY-SA http://www.flickr.com/photos/kelleys/492253912/
- 20. Robust Storage Append Only FileStructure Designed to Crash Instant-On
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- 34. Scaling Down 4 MB RAM
- 35. Erlang Parallel Fault tolerant Addictive Ninja Syntax http://www.sics.se/~joe/apachevsyaws.html
- 36. Browser Couch JavaScript port Uses HTML5 storage Replicates with CouchDB http://hg.toolness.com/browser-couch/
- 37. No SQL in HTML5
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- 39. curl -X POSThttp://127.0.0.1:5984/_replicate -d '{"source":"http://couch.example.com:5984/remote-db", "target":"local-db"}'
- 40. curl -X POSThttp://127.0.0.1:5984/_replicate -d '{"source":"http://couch.example.com:5984/remote-db", "target":"local-db"}'
- 52. Document Oriented Not Relational • Documents in the Real World™ • Bills, letters, tax forms… • Same type != same structure • Self contained • Can be out of date (so what?) • No references
- 53. Document Oriented Not Relational • Documents in the Real World™ Bills, letters, tax forms… Natural Data • • Same type != same structure • Behaviour Can be out of date (so what?) • No references
- 58. Render JSON Docsas HTML shows/post.js /drl/_design/sofa/_show/post/Hello-World-For-Real-This-Time
- 60. Render Views asHTML lists/index.js /drl/_list/sofa/index/recent-posts?descending=true&limit=8
- 69. Resources @CouchDB http://couchdb.apache.org/ Dress like a Couch: http://shop.couchdb.com http://planet.couchdb.org/ https://peepcode.com/products/couchdb-with-rails
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- 71. couch.io Berlin – London– Portland
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