CouchDB, PHPillow & PHP

CouchDB, PHP & PHPillow http://joind.in/1465 Kore Nordmann <kore@php.net> @koredn February 26, 2010 http://kore-nordmann.de/portfolio.html Kore Nordmann <kore@php.net>

2 / 70 About me Kore Nordmann, <kore@php.net> Long time PHP developer Regular speaker, author, etc. Studies computer science in Dortmund, currently writing thesis Active open source developer: eZ Components (Graph, WebDav, Document), Arbit, PHPUnit, Torii, PHPillow, KaForkL, Image 3D, WCV, ... http://kore-nordmann.de/portfolio.html Kore Nordmann <kore@php.net>

3 / 70 Outline Introduction General Structure API Views Consistency PHPillow Applications QA http://kore-nordmann.de/portfolio.html Kore Nordmann <kore@php.net>

4 / 70 CouchDB is paradigmn shift Structure Consistency API Applications http://kore-nordmann.de/portfolio.html Kore Nordmann <kore@php.net>

6 / 70 CouchDB Apache top-level project Build in Erlang / on Erlang/OTP http://kore-nordmann.de/portfolio.html Kore Nordmann <kore@php.net>

8 / 70 Structure Document based database No pre-deﬁned structure (tables) Put in any JSON object you want Even deep structures (arrays of objects) You may attach any number of ﬁles to documents http://kore-nordmann.de/portfolio.html Kore Nordmann <kore@php.net>

9 / 70 Structure Example wiki document 1 { ” t i t l e ”: ”PHPUK 2 0 1 0 ” , 2 ” text ”: ” Welcome t o t h e PHPUK . . . ” , 3 ” creator ”: ” u s e r −b a r ” , 4 ” edited ”: 2935678239 , 5 ” r e v i s i o n s ”: [ 6 { ” t i t l e ”: ”PHPUK 2 0 0 9 ” , 7 ” text ”: ” Welcome t o t h e PHPUK . . . ” , 8 ” c r e a t o r ” : ” u s e r −f o o ” , 9 ” e d i t e d ” : 2935678183 , 10 ] 11 }, 12 ... 13 ] 14 } http://kore-nordmann.de/portfolio.html Kore Nordmann <kore@php.net>

10 / 70 Attachements Example wiki document 1 { ” t i t l e ”: ”PHPUK 2 0 1 0 ” , 2 ” creator ”: ” u s e r −b a r ” , 3 ” text ”: ”<h1>Welcome t o t h e PHPUK</h1> 4 5 <img s r c =” p h p u k 2 0 1 0 / l o g o . png ” a l t =” PHPUK l o g o ”/> 6 ...” , 7 ” attachments ”: { 8 ” l o g o . png ” : { 9 ” c o n t e n t t y p e ” : ” image / png ” , 10 ” stub ”: true , 11 ” length ”: 42 , 12 } 13 } 14 } http://kore-nordmann.de/portfolio.html Kore Nordmann <kore@php.net>

11 / 70 Migration / Refactoring Change document structure at any time No need for non-transaction-safe Data Deﬁnition Language (DDL) Fits rapid development approaches with common customer requested changes to the data structure You need to handle this in your application properly, of course: Incrementally update structure on modiﬁcation Liberal validation on read http://kore-nordmann.de/portfolio.html Kore Nordmann <kore@php.net>

13 / 70 HTTP API RESTful HTTP access HTTP is available on “all” platforms natively No PHP extension required Just use PHPs HTTP stream wrapper, pecl/http or curl You can use all your known HTTP middleware Reverse proxies for scaling reads (Varnish, Squid) Simple custom proxy conﬁguration for direct “AJAX” access http://kore-nordmann.de/portfolio.html Kore Nordmann <kore@php.net>

14 / 70 HTTP API GET / POST / PUT / DELETE <METHOD> http://<host>/<database>/<document> http://kore-nordmann.de/portfolio.html Kore Nordmann <kore@php.net>

15 / 70 Create a database 1 $ c u r l − i −X PUT h t t p : / / l o c a l h o s t : 5 9 8 4 / p h p u k w i k i 2 3 HTTP/ 1 . 1 201 C r e a t e d 4 S e r v e r : CouchDB / 0 . 1 0 . 0 ( E r l a n g OTP/R13B ) 5 Location : http :// l o c a l h o s t :5984/ phpuk wiki 6 Date : F r i , 13 Jan 2009 1 4 : 0 7 : 5 7 GMT 7 Content −Type : t e x t / p l a i n ; c h a r s e t=u t f −8 8 Content −L e n g t h : 12 9 Cache−C o n t r o l : must−r e v a l i d a t e 10 11 {” ok ” : t r u e } http://kore-nordmann.de/portfolio.html Kore Nordmann <kore@php.net>

16 / 70 Create a wiki document 1 $ c u r l − i −X PUT h t t p : / / l o c a l h o s t : 5 9 8 4 / p h p u k w i k i / S t a r t −−d a t a ’ { ” name ” : ” S t a r t ” , ” t e x t ” : ” H e l l o World ! ” } ’ 2 3 HTTP/ 1 . 1 201 C r e a t e d 4 S e r v e r : CouchDB / 0 . 1 0 . 0 ( E r l a n g OTP/R13B ) 5 Location : http :// l o c a l h o s t :5984/ phpuk wiki / Start 6 Etag : ”1−6 b f d 4 8 8 5 b 6 c 6 2 b b 5 1 6 9 a 1 9 d 5 a 8 1 9 2 7 e 3 ” 7 Date : F r i , 13 Jan 2009 1 4 : 1 4 : 5 5 GMT 8 Content −Type : t e x t / p l a i n ; c h a r s e t=u t f −8 9 Content −L e n g t h : 68 10 Cache−C o n t r o l : must−r e v a l i d a t e 11 12 {” ok ” : t r u e , ” i d ” : ” S t a r t ” , ” r e v ”:”1 −6 b f d 4 8 8 5 b 6 c 6 2 b b 5 1 6 9 a 1 9 d 5 a 8 1 9 2 7 e 3 ”} http://kore-nordmann.de/portfolio.html Kore Nordmann <kore@php.net>

17 / 70 Get a wiki document back 1 $ c u r l − i −X GET h t t p : / / l o c a l h o s t : 5 9 8 4 / p h p u k w i k i / S t a r t 2 3 HTTP/ 1 . 1 200 OK 4 S e r v e r : CouchDB / 0 . 1 0 . 0 ( E r l a n g OTP/R13B ) 5 Etag : ”1−6 b f d 4 8 8 5 b 6 c 6 2 b b 5 1 6 9 a 1 9 d 5 a 8 1 9 2 7 e 3 ” 6 Date : F r i , 13 Jan 2009 1 4 : 1 5 : 4 8 GMT 7 Content −Type : t e x t / p l a i n ; c h a r s e t=u t f −8 8 Content −L e n g t h : 97 9 Cache−C o n t r o l : must−r e v a l i d a t e 10 11 {” i d ” : ” S t a r t ” , ” r e v ”:”1 −6 b f d 4 8 8 5 b 6 c 6 2 b b 5 1 6 9 a 1 9 d 5 a 8 1 9 2 7 e 3 ” , ” name ” : ” S t a r t ” , ” t e x t ” : ” H e l l o World ! ” } http://kore-nordmann.de/portfolio.html Kore Nordmann <kore@php.net>

18 / 70 Security Simple database based access restrictions Using HTTP plain auth More ﬁne grained access control will be in next release Deﬁne functions which decide if a request from a user will be accepted. http://kore-nordmann.de/portfolio.html Kore Nordmann <kore@php.net>

20 / 70 Data access How to query such a mess? Views are small scripts, run for all documents in a database Views are built iteratively, results stored in BTrees Once built, they are fast Mostly JavaScript, but also PHP, Ruby, Perl, Erlang, ... A view may emit any number of key-value pairs for each document Key and value may be any JSON structure http://kore-nordmann.de/portfolio.html Kore Nordmann <kore@php.net>

21 / 70 Wiki Index all wiki documents by their title 1 f u n c t i o n ( doc ) 2 { 3 i f ( doc . t i t l e && doc . t e x t ) 4 { 5 e m i t ( doc . t i t l e , doc . i d ) ; 6 } 7 } http://kore-nordmann.de/portfolio.html Kore Nordmann <kore@php.net>

22 / 70 Wiki Index all wiki documents by their title 1 f u n c t i o n ( doc ) 2 { 3 i f ( doc . t y p e == ” w i k i ” ) 4 { 5 e m i t ( doc . t i t l e , doc . i d ) ; 6 } 7 } http://kore-nordmann.de/portfolio.html Kore Nordmann <kore@php.net>

23 / 70 Wiki Index all documents by their title 1 ” BuildModuleDesign ” => ” w i k i −b u i l d m o d u l e d e s i g n ” 2 ” CodingGuidelines ” => ” w i k i −c o d i n g g u i d e l i n e s ” 3 ” DiscussionProtocols ” => ” w i k i −d i s c u s s i o n p r o t o c o l s ” 4 ” ModuleDesign ” => ” w i k i −m o d u l e d e s i g n ” 5 ” Protocol 08 02 07 ” => ” w i k i −p r o t o c o l 0 8 0 2 0 7 ” 6 ” VCSModuleDesign ” => ” w i k i −v c s m o d u l e d e s i g n ” 7 ... Custom deteministic IDs can ensure uniqueness of documents Just set the id property on insert. CouchDB can also generate IDs for you http://kore-nordmann.de/portfolio.html Kore Nordmann <kore@php.net>

24 / 70 Map-reduce-views “MapReduce is a software framework introduced by Google to support distributed computing on large data sets on clusters of computers.” [Wik09] Used by CouchDB to implement views Just a framework / pattern: You can implement “any” algorithm using map-reduce. http://kore-nordmann.de/portfolio.html Kore Nordmann <kore@php.net>

25 / 70 Map-Reduce Documents http://kore-nordmann.de/portfolio.html Kore Nordmann <kore@php.net>

26 / 70 Map-Reduce Documents Map $key:$value $key:$value $key:$value $key:$value http://kore-nordmann.de/portfolio.html Kore Nordmann <kore@php.net>

27 / 70 Map-Reduce Documents Map Reduce $key:$value $key:$value $key:$value $key:$value $key:$value http://kore-nordmann.de/portfolio.html Kore Nordmann <kore@php.net>

28 / 70 Map-Reduce Documents Map Reduce Re-Reduce Cluster 1 $key:$value $key:$value $key:$value $key:$value Cluster 2 $key:$value $key:$value $key:$value http://kore-nordmann.de/portfolio.html Kore Nordmann <kore@php.net>

29 / 70 Map-Reduce Map and reduce functions are custom Reduce is optional, plain view serves as a document index Reduce may be applied to subsets of the documents Reduce may be grouped http://kore-nordmann.de/portfolio.html Kore Nordmann <kore@php.net>

30 / 70 Map-Reduce example The simplest reduce function is just count() Often used for statistics 1 f u n c t i o n ( k e y s , v a l u e s , combine ) 2 { 3 r e t u r n sum ( v a l u e s ) ; 4 } http://kore-nordmann.de/portfolio.html Kore Nordmann <kore@php.net>

31 / 70 Map-Reduce example The reduce result 1 null => 42 http://kore-nordmann.de/portfolio.html Kore Nordmann <kore@php.net>

32 / 70 More... What should be covered in more depth? Map-reduce views in CouchDB Scalability / consistency in CouchDB The PHPillow API http://kore-nordmann.de/portfolio.html Kore Nordmann <kore@php.net>

33 / 70 Map-Reduce example The map function 1 f u n c t i o n ( doc ) 2 { 3 i f ( doc . t y p e == ” w i k i ” ) 4 { 5 d a t e = new Date ( ) ; 6 d a t e . s e t T i m e ( doc . e d i t e d ∗ 1000 ) ; 7 emit ( [ 8 date . getUTCFullYear ( ) , 9 d a t e . getUTCMonth ( ) + 1 , 10 d a t e . getUTCDate ( ) , 11 d a t e . getUTCHours ( ) , 12 d a t e . getUTCMinutes ( ) , 13 d a t e . getUTCSeconds ( ) , 14 ], 1 ); 15 // You c o u l d a l s o e m i t t h e w h o l e doc a s v a l u e 16 } 17 } http://kore-nordmann.de/portfolio.html Kore Nordmann <kore@php.net>

34 / 70 Map-Reduce example The mapping result 1 [2008 , 10 , 11 , 9, 11 , 12] => 1 2 [2008 , 10 , 11 , 9, 11 , 12] => 1 3 [2008 , 10 , 11 , 9, 11 , 12] => 1 4 [2008 , 10 , 11 , 9, 13 , 8] => 1 5 [2008 , 10 , 11 , 9, 13 , 44] => 1 6 [2008 , 10 , 11 , 9, 14 , 2] => 1 7 [2008 , 10 , 12 , 17 , 46 , 15] => 1 8 [2008 , 10 , 12 , 17 , 57 , 52] => 1 9 [2008 , 10 , 12 , 18 , 0, 45] => 1 10 [2008 , 10 , 14 , 8, 36 , 29] => 1 11 [2008 , 10 , 14 , 19 , 33 , 21] => 1 12 [2008 , 10 , 14 , 19 , 33 , 35] => 1 http://kore-nordmann.de/portfolio.html Kore Nordmann <kore@php.net>

35 / 70 Map-Reduce example The reduce function 1 f u n c t i o n ( k e y s , v a l u e s , combine ) 2 { 3 r e t u r n sum ( v a l u e s ) ; 4 } http://kore-nordmann.de/portfolio.html Kore Nordmann <kore@php.net>

36 / 70 Map-Reduce example The reduce result 1 null => 12 http://kore-nordmann.de/portfolio.html Kore Nordmann <kore@php.net>

37 / 70 Map-Reduce example The grouped reduce result 1 [2008 , 10 , 11 , 9, 11 , 12] => 3 2 [2008 , 10 , 11 , 9, 13 , 8] => 1 3 [2008 , 10 , 11 , 9, 13 , 44] => 1 4 [2008 , 10 , 11 , 9, 14 , 2] => 1 5 [2008 , 10 , 12 , 17 , 46 , 15] => 1 6 [2008 , 10 , 12 , 17 , 57 , 52] => 1 7 [2008 , 10 , 12 , 18 , 0, 45] => 1 8 [2008 , 10 , 14 , 8, 36 , 29] => 1 9 [2008 , 10 , 14 , 19 , 33 , 21] => 1 10 [2008 , 10 , 14 , 19 , 33 , 35] => 1 http://kore-nordmann.de/portfolio.html Kore Nordmann <kore@php.net>

38 / 70 Map-Reduce example The ﬁltered grouped reduce result startkey=[2008,10,11] and endkey=[2008,10,12] 1 [2008 , 10 , 11 , 9, 11 , 12] => 3 2 [2008 , 10 , 11 , 9, 13 , 8] => 1 3 [2008 , 10 , 11 , 9, 13 , 44] => 1 4 [2008 , 10 , 11 , 9, 14 , 2] => 1 http://kore-nordmann.de/portfolio.html Kore Nordmann <kore@php.net>

39 / 70 Map-Reduce example The grouped reduce result, with group level group-level=3 1 [2008 , 10 , 11] => 6 2 [2008 , 10 , 12] => 3 3 [2008 , 10 , 14] => 3 http://kore-nordmann.de/portfolio.html Kore Nordmann <kore@php.net>

40 / 70 Full-Text-Search Index all documents by all their words 1 f u n c t i o n ( doc ) { 2 i f ( doc . t y p e == ” w i k i ” ) { 3 // S i m p l e word i n d e x i n g , d o e s n o t r e s p e c t o v e r a l l o c c u r e n c e s o f words , 4 // s t o p w o r d s , d i f f e r e n t word s e p e r a t i o n c h a r a c t e r s , o r word v a r i a t i o n s . 5 v a r t e x t = doc . t i t l e . r e p l a c e ( / [ s : . , ! ? − ] + / g , ” ” ) + 6 doc . t e x t . r e p l a c e ( / [ s : . , ! ? − ] + / g , ” ” ) ; 7 v a r words = t e x t . s p l i t ( ” ” ) ; 8 f o r ( v a r i = 0 ; i < words . l e n g t h ; ++i ) { 9 value = {}; 10 v a l u e [ doc . i d ] = 1 ; 11 e m i t ( words [ i ] . t o L o w e r C a s e ( ) , v a l u e ) ; 12 } 13 } 14 } http://kore-nordmann.de/portfolio.html Kore Nordmann <kore@php.net>

41 / 70 Wiki Index all documents by all their words 1 ... 2 ”a” => { wiki −8: 1} 3 ”a” => { wiki −8: 1} 4 ”a” => { wiki −8: 1} 5 ”a” => { wiki −8: 1} 6 ”a” => { wiki −81: 1} 7 ”a” => { wiki −83: 1} 8 ”a” => { wiki −83: 1} 9 ” able ” => { wiki −39: 1} 10 ” able ” => { wiki −56: 1} 11 ” able ” => { wiki −73: 1} 12 ” able ” => { wiki −80: 1} 13 ” about ” => { wiki −24: 1} 14 ” about ” => { wiki −43: 1} 15 ” about ” => { wiki −85: 1} 16 ... http://kore-nordmann.de/portfolio.html Kore Nordmann <kore@php.net>

42 / 70 Full-Text-Search Reduce by word count 1 f u n c t i o n ( keys , v a l u e s ) { 2 var count = {}; 3 for ( var i in values ) { 4 for ( var id in values [ i ] ) { 5 i f ( count [ i d ] ) { 6 count [ i d ] = v a l u e s [ i ] [ i d ] + count [ i d ] ; 7 } else { 8 count [ i d ] = v a l u e s [ i ] [ i d ] ; 9 } 10 } 11 } 12 return count ; 13 } http://kore-nordmann.de/portfolio.html Kore Nordmann <kore@php.net>

43 / 70 Wiki Index all documents by all their words 1 ... 2 ”a” => { 3 wiki −68: 6, 4 wiki −66: 6, 5 wiki −22: 4, 6 wiki −63: 3, 7 wiki −60: 2, 8 wiki −35: 2, 9 wiki −34: 1, 10 wiki −31: 1, 11 ... 12 } 13 ” a b l e ” => { w i k i −86: 1 , w i k i −80: 1 , w i k i −73: 1 , w i k i −56: 1 , w i k i −39: 1} 14 ” a b o u t ” => { w i k i −85: 1 , w i k i −43: 1 , w i k i −24: 1} 15 ... http://kore-nordmann.de/portfolio.html Kore Nordmann <kore@php.net>

45 / 70 Local conﬂicts Multi-Version Concurrency Control All documents in the database are versioned Don’t use it for application level document versioning Updates and deletes need to specify the revision ID Changing outdated documents result in conﬂicts http://kore-nordmann.de/portfolio.html Kore Nordmann <kore@php.net>

46 / 70 Inter document links There is no ensured inter document consistency in CouchDB Diﬀerent possibilities of relating documents: List IDs of related documents in document (n:m) ... both directions are feasible Embed the whole related document (1:n) Solution depends on update-ratio 1 { ” type ”: ” wiki ” , 2 ” t i t l e ”: ” Hello world ” , 3 ” text ”: ”...” , 4 ” comments ” : [ 5 { ”comment ” : ” . . . ” } , 6 ], 7 ” c r e a t o r ” : ” u s e r −f o o ” , 8 } http://kore-nordmann.de/portfolio.html Kore Nordmann <kore@php.net>

47 / 70 Scaling: The CAP theorem The CAP theorem, read more in “CouchDB: The Deﬁnitive Guide” [JCA09] CouchDB Partition Availability tolerance eventual consistency PAXON RDBMS consensus enforced Consistency protocols consistency CouchDB employs “Eventual Consistency” [Vog09] http://kore-nordmann.de/portfolio.html Kore Nordmann <kore@php.net>

48 / 70 Eventual consistency Europe Client / Web-Application Asia Amerika Delayed, triggered synchronization (push, pull) Deterministic (manual) conﬂict resolution on replication on all nodes Scales well for seldom concurrent writes Structure your documents accordingly http://kore-nordmann.de/portfolio.html Kore Nordmann <kore@php.net>

48 / 70 Eventual consistency Europe Asia Amerika Delayed, triggered synchronization (push, pull) Deterministic (manual) conﬂict resolution on replication on all nodes Scales well for seldom concurrent writes Structure your documents accordingly http://kore-nordmann.de/portfolio.html Kore Nordmann <kore@php.net>

48 / 70 Eventual consistency Europe Client / Web-Application Asia Amerika Delayed, triggered synchronization (push, pull) Deterministic (manual) conﬂict resolution on replication on all nodes Scales well for seldom concurrent writes Structure your documents accordingly http://kore-nordmann.de/portfolio.html Kore Nordmann <kore@php.net>

50 / 70 PHPillow Object-oriented client for CouchDB PHP >= 5.2 since last release (5.3 only before) >96% test coverage Still in alpha state Since CouchDB just got “beta” recently, and no new release was required. http://kore-nordmann.de/portfolio.html Kore Nordmann <kore@php.net>

51 / 70 PHPillow Lightweight layer Features Simple document validation constraints Automatic synchronization of views Automatic versioning of documents couchdb-python compatible tool for dump and import Diﬀerent connection handlers PHP HTTP stream wrapper Custom HTTP protocol implementation Which is faster, most likely because of Connection: Keep-Alive http://kore-nordmann.de/portfolio.html Kore Nordmann <kore@php.net>

52 / 70 A document class A custom document class 1 <?php 2 c l a s s myUserDocument e x t e n d s p h p i l l o w D o c u m e n t { 3 protected $versioned = true ; 4 5 // . . . 6 } http://kore-nordmann.de/portfolio.html Kore Nordmann <kore@php.net>

53 / 70 A document class A custom document class 1 <?php 2 c l a s s myUserDocument e x t e n d s p h p i l l o w D o c u m e n t { 3 protected $versioned = true ; 4 5 protected $ r e q u i r e d P r o p e r t i e s = array ( 6 ’ login ’ , 7 ); 8 9 // . . . 10 } http://kore-nordmann.de/portfolio.html Kore Nordmann <kore@php.net>

54 / 70 A document class A custom document class 1 <?php 2 c l a s s myUserDocument e x t e n d s p h p i l l o w D o c u m e n t { 3 // . . . 4 public function construct () { 5 $ t h i s −>p r o p e r t i e s = a r r a y ( 6 ’ login ’ => new new p h p i l l o w R e g e x p V a l i d a t o r ( ’ ( ˆ [ x21 −x 7 e ]+$ ) ’ ) , 7 ’ name ’ => new p h p i l l o w S t r i n g V a l i d a t o r ( ) , 8 ’ f r i e n d s ’ => new phpillowDocumentArrayValidator ( ’ myUserDocument ’ ) , 9 ... 10 ); 11 parent : : construct () ; 12 } 13 // . . . 14 } http://kore-nordmann.de/portfolio.html Kore Nordmann <kore@php.net>

55 / 70 A document class A custom document class 1 <?php 2 c l a s s myUserDocument e x t e n d s p h p i l l o w D o c u m e n t { 3 // . . . 4 protected function generateId () { 5 // R e t u r n n u l l f o r auto−g e n e r a t e d I D s 6 r e t u r n $ t h i s −>s t r i n g T o I d ( $ t h i s −>s t o r a g e −>l o g i n ); 7 } 8 // . . . 9 } http://kore-nordmann.de/portfolio.html Kore Nordmann <kore@php.net>

56 / 70 A document class A custom document class 1 <?php 2 c l a s s myUserDocument e x t e n d s p h p i l l o w D o c u m e n t { 3 // . . . 4 p r o t e c t e d f u n c t i o n getType ( ) { 5 return ’ user ’ ; 6 } 7 } http://kore-nordmann.de/portfolio.html Kore Nordmann <kore@php.net>

57 / 70 Document examples Document creation example 1 // C r e a t e a document 2 $doc = new myUserDocument ( ) ; 3 $doc−>l o g i n = ’ k o r e ’ ; 4 $doc−>name = ’ Kore Nordmann ’ ; 5 $doc−>d a t a = a r r a y ( 6 ’ m a i l ’ => ” kore@php . n e t ” , 7 // . . . 8 ); 9 10 try { 11 $ i d = $doc−>s a v e ( ) ; 12 } ( p h p i l l o w R e s p o n s e C o n f l i c t E r r o r E x c e p t i o n $e ) { 13 // Document a l r e a d y e x i s t s 14 } 15 16 // F e t c h a document by ID 17 $doc = new myUserDocument ( $ i d ) ; http://kore-nordmann.de/portfolio.html Kore Nordmann <kore@php.net>

58 / 70 View examples View class 1 c l a s s myUserView e x t e n d s p h p i l l o w F i l e V i e w { 2 public function construct () { 3 parent : : construct () ; 4 5 $ t h i s −>v i e w F u n c t i o n s = array ( 6 ’ a l l ’ => a r r a y ( 7 ’ map ’ => ’ map/ u s e r a l l . j s ’ , 8 ), 9 ’ u s e r ’ => a r r a y ( 10 ’ map ’ => ’ map/ u s e r u s e r . j s ’ , 11 ’ r e d u c e ’ => ’ r e d u c e /sum . j s ’ , 12 ), 13 ); 14 } 15 16 // . . . 17 } http://kore-nordmann.de/portfolio.html Kore Nordmann <kore@php.net>

59 / 70 View examples View class 1 c l a s s myUserView e x t e n d s p h p i l l o w F i l e V i e w { 2 // . . . 3 4 p r o t e c t e d f u n c t i o n getViewName ( ) { 5 return ’ users ’ ; 6 } 7 } http://kore-nordmann.de/portfolio.html Kore Nordmann <kore@php.net>

60 / 70 View examples Query a view 1 $ u s e r s = myUserView : : a l l ( a r r a y ( 2 ’ k e y ’ => ’ Kore Nordmann ’ , 3 ) ); PHPillow validates and converts allowed view parameters What happens: View function will be uploaded to the database CouchDB will index all documents in the database using the view function View results will be returned as an array http://kore-nordmann.de/portfolio.html Kore Nordmann <kore@php.net>

62 / 70 Attachments CouchDB allows you to attach ﬁles to documents Files are replicated You can serve full Web-Applications from a CouchDB See CouchApp Deploy using PUSH-replication http://kore-nordmann.de/portfolio.html Kore Nordmann <kore@php.net>

63 / 70 Eventual consistency Mirror database into userspace Oﬄine usage and synchronization of Browser applications Mozilla develops a JavaScript implementation of the CouchDB API [Moz09] http://kore-nordmann.de/portfolio.html Kore Nordmann <kore@php.net>

64 / 70 Ubuntu One Ubuntu One uses CouchDB Synchronize contacts & date between nodes, or to a server Yes, all Ubuntu Karmic users already have a CouchDB running http://kore-nordmann.de/portfolio.html Kore Nordmann <kore@php.net>

65 / 70 Various applications Arbit uses CouchDB for issue tracking, wiki, FAQ and more Other applications: http: //wiki.apache.org/couchdb/CouchDB_in_the_wild http://kore-nordmann.de/portfolio.html Kore Nordmann <kore@php.net>

66 / 70 Summary CouchDB is fast (enough) Document oriented approach allows new application development approaches CouchDB scales really well, horizontaly and verticaly CouchDB ﬁts web applications really well RDBMS are still better for single-cluster scalable applications with strong integrity requirements. http://kore-nordmann.de/portfolio.html Kore Nordmann <kore@php.net>

68 / 70 Resources Apache CouchDB: http://couchdb.org/ Free CouchDB book: http://books.couchdb.org/relax/ PHPillow: http://arbitracker.org/phpillow.html http://kore-nordmann.de/portfolio.html Kore Nordmann <kore@php.net>

69 / 70 The end Open questions? Further remarks? Contact Mail: <kore@php.net> Web: http://kore-nordmann.de/ (Slides will be available here soonish) Twitter: http://twitter.com/koredn Comment: http://joind.in/1465 http://kore-nordmann.de/portfolio.html Kore Nordmann <kore@php.net>

70 / 70 Bibliography I [JCA09] Noah Slater J. Chris Anderson, Jan Lehnardt, Couchdb: The deﬁnitive guide, O’Reilly Media, Inc., 2009. [Moz09] Mozilla, Browsercouch documentation, November 2009. [Vog09] Werner Vogels, Eventually consistent - revisited, http://www.allthingsdistributed.com/2008/12/eventually_ consistent.html, December 2009. [Wik09] Wikipedia, Mapreduce — wikipedia, the free encyclopedia, 2009, [Online; accessed 27-August-2009]. http://kore-nordmann.de/portfolio.html Kore Nordmann <kore@php.net>

CouchDB, PHPillow & PHP

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