Marcos Tapajós
http://tapajos.me
marcos@tapajos.me

passado X presente
Múltiplos usuários
Um usuário
simultâneos
Uma instância Múltiplas instâncias
Processamento em
Uma operação por vez
paralelo

Cassandra

http://www.flickr.com/photos/daveaustria/2653377265/

Damien Katz
• IBM
• CouchDB em 2005
• Lotus Notes, MySQL

http://www.stilo.com

No mundo real
• Boletos
• Cartas
• Currículos

JavaScript Object Notation
http://www.myspace.com/jsonsb

{
"name": "Carol",
"type": "beatiful_person",
"profession": "Model",
"_attachments": {
"morena.jpg": {
"stub": true,
"content_type":"image/jpeg",
"length": 74635
}
}
}

mesmo tipo != mesma estrutura
http://www.iconarchive.com/icons/icons-land/sport/Football-Ball-256x256.png http://pt.wikipedia.org/wiki/Ficheiro:Soccer_ball.svg

http://www.hss.state.ak.us

HTTP REST API

HTTP REST API
• Create: POST /database
• Create: PUT /database/document_id
• Read: GET /database/document_id
• Update: PUT /database/document_id
• Delete: DELETE /database/document_id

ACID
t
o
m
o
n
s
s
o
l
u
r
a
i b
i s a
i
c t t
l
i e i
i
t n o
t
y c n
y
y

MVCC
u
l
e
r
o
n
c
o
n
t s u t
i i r r
o r o
n e l
n
c
y

http://catcubed.com

http://www.vend123.com

http://shineanthology.files.wordpress.com/2009/06/optimism_yellow.jpg

VIEWS

http://www.gridgainsystems.com

MAP

MAP/REDUCE

used with autorization of Chris Anderson and Jan Lehnardt

curl -X POST
http://127.0.0.1:5984/_replicate
-d
'{
"source":
"http://couch.example.com:5984/remote-db",
"target":
"local-db"
}'
used with autorization of Chris Anderson and Jan Lehnardt

used with autorization of Chris Anderson and Jan Lehnardt

used with autorization of Chris Anderson and Jan Lehnardt

used with autorization of Chris Anderson and Jan Lehnardt

used with autorization of Chris Anderson and Jan Lehnardt

http://eustaquiorangel.com/images/git-logo.png http://www.sdtimes.com/blog/image.axd?picture=2009%2F3%2Fsubversion_logo-384x332.png

http://submitwebsiteurl.com/girl-beach-computer.jpg

CouchFoo RelaxDB
ActiveCouch CouchREST
Coach Potato CouchObject
http://www.flickr.com/photos/daveaustria/2592202290/in/set-72157605553323697/

CouchFoo RelaxDB
ActiveCouch CouchREST
Coach Potato CouchObject
http://www.flickr.com/photos/daveaustria/2592202290/in/set-72157605553323697/

LEGAL
CouchFoo RelaxDB
ActiveCouch CouchREST
Coach Potato CouchObject
http://www.flickr.com/photos/daveaustria/2592202290/in/set-72157605553323697/

NÃO TÃO LEGAL LEGAL
CouchFoo RelaxDB
ActiveCouch CouchREST
Coach Potato CouchObject
http://www.flickr.com/photos/daveaustria/2592202290/in/set-72157605553323697/

NÃO TÃO LEGAL LEGAL
ActiveRecord
CouchFoo RelaxDB
ActiveCouch CouchREST
Coach Potato CouchObject
http://www.flickr.com/photos/daveaustria/2592202290/in/set-72157605553323697/

CouchRest

@db = CouchRest.database!("http://127.0.0.1:5984/couchrest-
test")
response = @db.save_doc({:key => 'value', 'another key' =>
'another value'})
doc = @db.get(response['id'])
@db.bulk_save([
{"wild" => "and random"},
{"mild" => "yet local"},
{"another" => ["set","of","keys"]}
])
@db.save_doc({
"_id" => "_design/first",
:views => {
:test => {
:map => "function(doc){for(var w in doc){ if(!w.match(/
^_/))emit(w,doc[w])}}"
}
}
})

class Article < CouchRest::ExtendedDocument
include CouchRest::Validation
property :date, :cast => “Date”, :send => “parse”
property :title
property :slug
view_by :slug
validates_present :title
timestamps!
save_callback :before, :generate_slug_from_title
def generate_slug_from_title
self.slug = title.downcase.gsub(/[^a-z0-9]/,'-').
squeeze('-').gsub(/^-|-$/,'') if new?
end
end

used with autorization of Chris Anderson and Jan Lehnardt

+
used with autorization of Chris Anderson and Jan Lehnardt

+
used with autorization of Chris Anderson and Jan Lehnardt

http://www.flickr.com/photos/cbcastro/294210692/sizes/l/

RELAX

RELAX

OBRIGADO