1. CouchDB
relax

2. CouchDB
relax
Sander van de Graaf
svdgraaf

3. RELAX...

4. PERFORM LIKE A PR0N STAR

5. TOPICS
• NoSQL
• CouchDB in a nutshell
• Querying
• map/reduce
• Fulltext search
• CouchApps

6. NOSQL

7. IT’S A MOVEMENT

8. 1998

17. Carlo Strozzi

18. NOSQL == Not Only SQL

19. “[The NoSQL movement] departs from the relational
model altogether, it should therefore have been called
more appropriately ‘NoREL’, or something to that
effect.”
- Carlo Strozzi

20. LANDSCAPE

21. DISTRIBUTED VS NON-DISTRIBUTED
Distributed Non distributed
Amazon Dynamo Redis
Amazon S3 Tokyo Tyrant
Scalaris MemcacheDb
CouchDB Amazon SimpleDb
Voldemort
Riak
MongoDb
BigTable
Cassandra
HyperTable
HBase
source: Vineet Gupta http://bit.ly/5kuQgB

22. DATAMODEL STORAGE
Key/Value Document Column
Amazon Dynamo Amazon SimpleDb Cassandra
Amazon S3 CouchDB Google BigTable
Redis MongoDb HBase
Scalaris Riak Hyperbase
Voldemort

23. STORAGE
Memory Configurable Disk
Scalaris BigTable CouchDB
Redis Cassandra MongoDb
Hbase Riak
HyperTable Voldemort

24. CouchDB
relax

30. JAVASCRIPT

31. NUTSHELL

32. SPEED

33. APPEND ONLY

34. NO REPAIR NEEDED

35. COMPACTING

36. HTTP SERVER

37. CAP

38. CouchDB
CAP

39. CouchDB
EVENTUALLY CONSISTENT

40. ALLTHINGSDISTRIBUTED.COM

41. FULL REST API

42. REST
• GET • SELECT
• PUT • UPDATE
• POST • INSERT
• DELETE • DELETE
• COPY • ...

44. JSON
{
total_rows: 2,
offset: 0,
rows: [
{
id: '_design/foobar',
key: '_design/foobar',
value: { rev: '5-982b2fc36835715b2aae54609b5d5f1e' }
},
{
id: 'f0e1fd96eb6e094f74dda8d949000a6a',
key: 'f0e1fd96eb6e094f74dda8d949000a6a',
value: { rev: '1-86bca407fce8234a63c90ff549b56b10' }
},
]
}

45. REPLICATION

46. CouchDB
relax

47. CouchDB
relax
CouchDB
relax

48. CouchDB
relax
CouchDB
relax
CouchDB
relax
CouchDB
relax

49. CouchDB
relax
CouchDB
relax

50. CouchDB
relax
CouchDB
relax
CouchDB
relax

51. Laptop Desktop
CouchDB
relax
CouchDB
relax Phone
CouchDB
relax

52. US NL
CouchDB
relax
CouchDB
relax
CouchDB
relax

53. IDG US IDG AUSTRALIA
CouchDB
relax
CouchDB
relax CouchDB
relax
CouchDB
relax
CouchDB
relax CouchDB
relax
CouchDB
relax
CouchDB
relax
CouchDB
relax
IDG NL IDG DE

54. IDG US IDG Australia IDG Poland IDG Romania
CouchDB
relax
CouchDB
relax
CouchDB
relax
CouchDB
relax
CouchDB CouchDB
CouchDB
relax
CouchDB
relax
CouchDB
relax
relax relax
IDG NL IDG UK IDG Spania IDG Portugal
CouchDB
relax
CouchDB
relax CouchDB CouchDB CouchDB CouchDB
relax relax relax relax
IDG Germany IDG Brasil IDG Ghana IDG Hungary
CouchDB
relax
CouchDB
relax
CouchDB
relax CouchDB CouchDB
relax relax
IDG India IDG Thailand IDG Japan IDG Vietnam
CouchDB
relax
CouchDB
relax
CouchDB
relax
CouchDB
relax
CouchDB
relax
CouchDB
relax

55. P2P WEB

58. QUERYING

59. SELECT * FROM documents WHERE id = 123
GET /documents/123

60. SELECT * FROM documents WHERE id = 123
GET /documents/123
PUT /documents/123
POST /documents/123
DELETE /documents/123
etc.

61. MAP/REDUCE

63. INPUT
IP Bytes
212.122.174.13 18271
212.122.174.13 191726
212.122.174.13 198
74.119.8.111 91272
74.119.8.111 8371
212.122.174.13 43

64. MAPPER => REDUCER
IP Bytes
18271
191726
212.122.174.13
198
43
91272
74.119.8.111
8371

65. AFTER REDUCE
IP Bytes
212.122.174.13 210238
74.119.8.111 99643

66. MAP/REDUCE
SELECT COUNT(foo)
FROM documents
WHERE 1
GROUP BY foo;

67. MAP/REDUCE

68. MAP/REDUCE
function(doc) {
emit(doc.foo, doc);
}

69. MAP/REDUCE

70. MAP/REDUCE
function(keys, values, rereduce) {
return sum(values);
}

71. MAP/REDUCE

72. COUCHDB-LUCENE
http://github.com/rnewson/couchdb-lucene

73. CONFIG
[external]
fti=/path/to/python /path/to/couchdb-lucene/tools/couchdb-external-hook.py
[httpd_db_handlers]
_fti = {couch_httpd_external, handle_external_req, <<"fti">>}

74. http://127.0.0.1:5984> GET /foobar/_design/foobar

75. _DESIGN
{
_id: '_design/foobar',
_rev: '8-03a6bc983c721b1cc0ae4b461326bc31',
language: 'javascript',
views: {
foo: { map: 'function(doc) {n emit(doc.foo,1);n}',
reduce: 'function(keys, values, rereduce) {return sum(values);}' }
}
}

76. _DESIGN
{
_id: '_design/foobar',
_rev: '8-03a6bc983c721b1cc0ae4b461326bc31',
language: 'javascript',
views: {
foo: { map: 'function(doc) {n emit(doc.foo,1);n}',
reduce: 'function(keys, values, rereduce) {return sum(values);}' }
},
fulltext: {
by_subject: {
index:"function(doc) { var ret=new Document(); ret.add
(doc.subject); return ret }"
},
}
}

77. _DESIGN
function(doc) {
var ret=new Document();
ret.add(doc.subject);
return ret
}

78. _DESIGN
function(doc) {
var result = new Document();
result.add(doc.subject, {"field":"subject", "store":"yes"});
result.add(doc.content, {"field":"subject"});
result.add(new Date(), {"field":"indexed_at"});
return result;
}

79. http://127.0.0.1:5984> GET /foobar/_fti/_design/foo/by_subject?q=foobar

80. http://127.0.0.1:5984> GET /foobar/_fti/_design/foo/by_subject?q=foobar

81. COUCHAPPS
http://github.com/couchapp/couchapp

82. “Distributed, scalable, web
applications you say?
omgwtfbbq!?!1!!!11!1!eleven”

83. _attachments

84. CouchDB
relax
CouchDB
relax
CouchDB
relax

85. COUCHAPP PUSH HTTP://LOCALHOST:5984/MYDB

86. LISTS
http://127.0.0.1:5984> GET /relax/_design/relax/_list/posts/all/foobar
HTTP/1.1 200 OK
Vary: Accept
Transfer-Encoding: chunked
Server: CouchDB/0.11.0 (Erlang OTP/R13B)
Etag: "DZZ19EPLWLHI89K1FOW9DGFT5"
Date: Sun, 11 Jul 2010 09:55:42 GMT
Content-Type: text/html
<h1>ponies</h1><p>rock!</p>

87. CouchDB
relax

88. CouchDB
relax

89. COUCHDBX
http://janl.github.com/couchdbx/

90. Q?