CouchDB & Ruby: You’re Doing it Wrong

COUCHDB&RubYYOU’RE DOING ITWRONGA PRESENTATION BY @timangladEFROM YOUR FRIENDS AT @cloudant

@timanglade

COUCHDB HOSTING +AD-HOC SOLUTIONS

Re:Identical nodes& Dist. Testing

Ruby:10% OF our USERS65% OF the I/OThat’s called having a vested interest, my Friends

COUCHDB➞ A SimplE REST STORE

tim$ curl -X GET https://localhost:5984/nosqlsummer/berlintim$ { _id: "berlin" _rev: "87-d666a8e1176a068b343d7ccca7260141" name: "Berlin" lifeguards: "Tim Lossen" welcome: "What could be a better excuse to hang …" }

A match madein HEAVEN?

In Rubyland:COUCHRESTgithub.com/couchrest

require couchrestdb = CouchRest.database!("https://tim.cloudant.com/nosqlsummer")db.get("berlin")=> { "name" => "Berlin", "lifeguards" => "Tim Lossen", "_rev" => "87-d666a8e1176a068b343d7ccca7260141", "welcome" => "What could be a better excuse to hang out …" }

Looking Good,right?

MEDIAN TIME TO SAVE A DOC 800 600Time spent (ms) 400 200 0 1k 10k 50k 100k Document Size

MAN, COUCHDBIS SO SLOW…

WRONGWRONGWRONG

require couchrestdb = CouchRest.database!("https://tim.cloudant.com/nosqlsummer")db.get("berlin")=> { "name" => "Berlin", "lifeguards" => "Tim Lossen", "_rev" => "87-d666a8e1176a068b343d7ccca7260141", "welcome" => "What could be a better excuse to hang out …" }

Warning #0CouchREST#Database! VS.CouchREST#Databaseupgrade to Couchrest 1.1.3 now

Warning #1Actually, don’t useMuch of CouchRESTAT ALLYou’LL Thank me later.

Warning #2Loada proper JSON LIBRARYMULTI_JSON = fail

Warning #3LOCALITY

Warning #4TO HTTPS… OR NOT?

Beforerequire couchrestdef my_function db = CouchRest.database!("https://tim-west.cloudant.com/mydb") db.save_doc(doc)defAFTERrequire json/extrequire couchrest@db = "http://tim-east.cloudant.com/mydb"def my_function CouchRest.put(@db, doc)end

Before 800 Decoding HTTP Encoding 600Time spent (ms) 400 200 0 1k 10k 50k 100k Document Size

How Much?10% ? 20% ? 30% ?

Before 800 Decoding HTTP Encoding 600Time spent (ms) 400 200 0 1k 10k 50k 100k Document Size

AFTER 800 Decoding HTTP Encoding 600Time spent (ms) 400 200 0 1k 10k 50k 100k Document Size

AFTER 30 Decoding HTTP Encoding 23Time spent (ms) 15 8 0 1k 10k 50k 100k Document Size

Lol96%AND Guess what, we’re not done yet…

Warning #5LOLJSON

MESSAGEPACKSay Hello to my little FRIEND

How complex?10 lines of code

With MessagePACK30 JSON Decoding HTTP Encoding2315 8 9MS 6MS 3ms 3ms0 1k 10k 50k 100k

COUCHDB➞ A NOT-SO-SimplE REST STORE

I SHOULD USECOUCHREST_MODEL,RIGHT?

WRONGWRONGWRONG

ODMs areA BAD IDEA

COUCHREST_MODELIS POORLYIMPLEMENTEDFile > Open > nightmare.RB

DoN’T USECOUCHREST_MODELOr I will personally hunt you downand punch you in the neck

➞ So WHAT?

GROUP INFOONE HTTP CALL PERRUBY METHODWrite views as necessaryIF you can’t ➡ Wrong DB?

{ "_id": "berlin", "country": "Germany", "meetings": { "2010-10-17": { "location": "Beergarden", "description": "Initial meeting. Come say hi!" } "2010-12-27": { "location": "Alexanderplatz", "description": "Second meeting. Yes!" } }}

LEARN HOW TO USEBULK_DOCSA no-brainer if you do multiple updatesinSIDE one ruby method

LEARN VIEWSTHE HARD WAY

MAPfunction(doc) { if (doc.type == city) { emit(doc.id, doc); }}

MAPfunction(doc) { if (doc.type == city) { emit(doc.id, doc[meetings].length); }}REDUCE_stats

LEARN VIEWSTHE NOT-SO-HARDWAYgithub.com/candlerb/couchdb_ruby_view

LEARNTO PUT MORE APPLOGIC IN COUCHDB

LEARNWHEN TO USEFULL-TEXT SEARCHDon’t WRITE A VIEW PER COLUMN-EQUIVALENT…

LEARNSTALE=OKCOUCHDB VIEW ARE UPDATED on READS.YOU MAY WAIT A WHILE…

➞ GOD MODE

Cloudant SoftlayerSinatra SINATRA APAC US-EAST users

LEARNTO LEVERAGEREPLICATION

Cloudant SOFTLAYERSinatra Cloudant Cloudant SINATRA APAC APAC US-East US-EAST users

LEARNHOW TO TWEAKCONSISTENCY

LEARNTO OFFLOADTO FRONT-END JS

LEARNTO CACHESOME COUCHDBROUTES

Cloudant SOFTLAYER CDNSinatra Cloudant Cloudant SINATRA APAC APAC US-East US-EAST users

Recap!1. NEVER USE COUCHREST_MODEL! !2. Be WARY OF COUCHREST! !3. LOAD A PROPER JSON LIBRARY! !4. PAY ATTENTION TO LOCALITY! !5. ONLY USE HTTPS WHEN NECESSARY! !6. Don’t be afraid to extend! !

GoEXPERIMENTIMPLEMENTMEASUREIMPROVEHAVE FUN

Free plan Open Sourcecloudant.com github.com /cloudant/bigcouch BigCouch

? cloudant.com tim@cloudant.comgithub.com/timanglade @timanglade

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CouchDB & Ruby: You’re Doing it Wrong

by Tim Anglade on Sep 16, 2011

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