CouchDB Tour - Fosdem 2010

8/14/2019 CouchDB Tour - Fosdem 2010

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CouchDB tourBenot Chesneau

07/02/2010 FOSDEM 2010

Monday, February 8, 2010


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[email protected], Couchbeam &Couchdbkit maintainer

Web craftmanminimal web & opensource

benot chesneau

mailto:[email protected]:[email protected]:[email protected]:[email protected]:[email protected]:[email protected]:[email protected]


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WHY COUCHDB ?

Document oriented



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WHY COUCHDB ?

Document oriented

HTTP native



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WHY COUCHDB ?

Document oriented

HTTP native

Local Data



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WHY COUCHDB ?

Document oriented

HTTP native

Local Data

P2P Applications



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WHY COUCHDB ?

Document oriented

HTTP native

Local Data

P2P Applications

Scale



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COUCHDB

DESIGNED FOR THE FUTUR



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COUCHDB


Erlang OTP



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COUCHDB


Erlang OTP

Append Only File Structure



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COUCHDB


Erlang OTP

Append Only File Structure

Crash tolerance

HTTP



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DocumentOriented



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DOCUMENT JSON

{

"_id": "foo", "_rev": "1-....",

"url": "http://apache.couchdb.org",

"vote": 1

}



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HTTP NATIVE

CouchDB is built

ofthe Web.

Jacob Kaplan-Moss - http://jacobian.org/writing/of-the-web/

http://jacobian.org/writing/of-the-web/http://jacobian.org/writing/of-the-web/http://jacobian.org/writing/of-the-web/http://jacobian.org/writing/of-the-web/


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API HTTP RESTGET / HTTP/1.1\r\nHost: 127.0.0.1:5984\r\n\r\n"

{"couchdb":"Welcome","version":"0.11.0b6ba76f83-git"}



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API HTTP REST

Web paradigm

GET / HTTP/1.1\r\nHost: 127.0.0.1:5984\r\n\r\n"




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API HTTP REST

Web paradigm

Supported everywhere





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API HTTP REST

Web paradigm

Supported everywhere

Lot of available tools/libs





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MAP/REDUCE

http://wiki.apache.org/couchdb/Using_Views

http://wiki.apache.org/couchdb/Using_Viewshttp://wiki.apache.org/couchdb/Using_Views


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MAP/REDUCE

Map/Reduce to extract informations from documents




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MAP/REDUCE


Javascript used to map documents




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MAP/REDUCE


Javascript used to map documents Design Doc

/db/_design/ddocname/_view




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MAP.JSfunction(doc) { if(doc.url&&doc.vote)

emit(doc.url, doc.vote);

}

{

"total_rows":3,

"offset":0,

"rows":[

{

"id":"15c92051cc81d564db4337a05087bc8d",

"key":"http://apache.couchdb.org",

"value":1

},

{

"id":"fa9658810d25cac893748e4ff15e7253",


"value":1

},

{

"id":"1fa0c68d8455196507b8b01645e65186",

"key":"http://mysql.com",

"value":-1

}]}

json

result

http://mysql.com/http://mysql.com/http://apache.couchdb.org/http://apache.couchdb.org/http://apache.couchdb.org/http://apache.couchdb.org/


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REDUCE.JS

function(keys, values, rereduce) {

return sum(values);

}

{

"rows":[

{

"key":"http://mysql.com",

"value":-1

},

{


"value":2

}

]}

json

result

http://apache.couchdb.org/http://apache.couchdb.org/http://mysql.com/http://mysql.com/


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http://wiki.apache.org/couchdb/Basics

http://wiki.apache.org/couchdb/Basicshttp://wiki.apache.org/couchdb/Basics


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Futon



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DEPLOY



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DEPLOY

Replication



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DEPLOY

Replication

Failover



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DEPLOY

Replication

Failover

Clustering



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REPLICATION

Incremental P2P replication



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REPLICATION


Updates notifications & _changes



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REPLICATION


Updates notifications & _changes

Take your data with you



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INCREMENTAL

REPLICATION



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CONTROL YOUR DATA

document design

map/reduce

return HTM or any format (latex,csv, ...)

couchapp



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RENDER A JSON

DOC IN HTML



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No db impact

cacheable

Render in HTML or any format

SHOW



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RENDER A VIEW IN HTML



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1 line at a time

no impact in RAM

Render in HTML or any format

LIST



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VALIDATION

On update

Per doc

Via a javascript function



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EXTEND

External

HTTP Handlers

Daemons



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HANDLERS DAEMONS


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HANDLERS, DAEMONS,

NOTFICATIONS Extends the CouchDB API with your own handlers : http or

authentification

Add HTTP services (bonjour, dbus, ..)

Notifications: stdin/stdout.

couchdb-lucene, geocouch, ...



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standalone CouchDB applications



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COUCHAPPS

P2P web

Local Data

Offline mode

Decentralize exchanges

Script : couchapp



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COUCHAPP

couchapp generate myapp

couchapp push mydb

couchapp clone http://benoitc.im/b/_design/blog

http://github.com/couchapp/couchapp

http://benoitc.im/b/_design/bloghttp://github.com/couchapp/couchapphttp://github.com/couchapp/couchapphttp://benoitc.im/b/_design/bloghttp://benoitc.im/b/_design/blog


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COUCHDB DESKTOP

On ubuntu karmic

Soon in your favorite os...

On your phone


Stuart Langridge - Canonical


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! !



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OrientDocument

offline



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THE FUTURE

Permissions managements (trunk)

Native clustering

CouchApps improved. CommonJS ?

Rest API improved (webmachine?)



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GO FURTHER

COUCHDB : http://couchdb.apache.org

book : http://books.couchdb.org/relax

couchapp wiki : http://wiki.github.com/couchapp/couchapp

irc #couchdb-fr sur freenodes

Enki multimedia : http://www.e-engura.com

http://www.e-engura.com/http://wiki.github.com/couchapp/couchapphttp://books.couchdb.org/relaxhttp://www.e-engura.com/http://www.e-engura.com/http://wiki.github.com/couchapp/couchapphttp://wiki.github.com/couchapp/couchapphttp://books.couchdb.org/relaxhttp://books.couchdb.org/relaxhttp://couchdb.apache.org/http://couchdb.apache.org/


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Questions



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CouchDB Tour - Fosdem 2010