Riak and Ruby

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Riak and RubyGrant Schofield

Developer AdvocateBasho Technologies, Inc.

Friday, July 9, 2010

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Grant Schofield(@schofield)

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NoSQL•Web 2.0, Cloud, Enterprise???

•Useful Reference Point

•Not AntiSQL

•Schemaless (Mostly)

•Diverse

•Thoughtful Data (Not just a NoSQL


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NoSQL Includes...

•Key Value Stores

•Document Databases

•Graphing Databases

•Column Databases

•Schemaless MySQL


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Prevalent Now

•Memcache???

•Session Data

•Caching Data

•Complements Traditional RDBMS

•Not The Magical Unicorn, but Pony Perhaps


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Riak•Open Source

•Erlang

•Dynamo and CAP Theorem Influenced

•Advanced Key Value Store

•Web Shaped

•Distributed by Nature

•Ops Obsessed

•A Platform


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Dynamo Paper•Key Value Store Built By Amazon for

Core Services

•Sacrifice Availability for Consistency

•Consistent Hashing

•Merkle Trees

•Vector Clocks

•Eventually Consistent


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CAP TheoremConsistency, Availability,

Partition Tolerance

•Dr. Eric Brewer

•At a Given Point You Get Two of the Three

•Riak is Tunable

•Eventual Consistency - Not an Excuse to Lose Data


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Advanced Key Value Store?

•Not Just PUT and GET Key/Values

•Multiple Interfaces

•Links

•Document Like

•Pluggable Backend

•Map/Reduce

•Distributed


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Web Shaped

•Biggest Distributed System Ever

•Works Like the Web

•Links

•Talks HTTP Restfully

•Load Balances Just Like Web Stuff


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Fundamentally Distributed

•Built From The Start

•Masterless

•Homogenous

•Consistent Hashing

•Scales Horizontally

•Fault Tolerant (Hinted Handoff)


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Consistent Hashing

2160/2

2160/4

node 0

node 1

node 2

node 3

hash(<<"beer">>,<<"dns">>)


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N, R, and W•N = Number of Replicas

•R = Number of Replicas Needed for a Read

•W = Number of Replicas Needed for a Write

•DW = Number of Replicas Needed for a Durable Write

•N Configurable Per Bucket

•R and W Configurable Per Request


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R Valueget(<<"beer">>,<<"dnr">>,

R=2)

{ok, Object}(N=3)

X


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W Valueput(<<"beer">>,<<"dnr">>,

W=2)

ok(N=3)

X


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N=10, R/W = 2get/put("beer", "dnr",

R/W=2)

{ok, Object}

(N=10)

X

XXX

X

XX

X


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Riak from CurlPutting Data In


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Taking Data Out


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Deleting The Data


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Finally, Ruby Stuff

•Sean Cribbs - RDRC Training

•riak-client - basic client

•ripple - associations, ActiveModel

•Really Elegant Code


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riak-clientgem install riak-client


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riak-clientget the data


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riak-clientmoar datas


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riak clientgot beer


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riak-clientwhy yes, I do


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Link Walkinghttp://localhost:8098/riak/beers/dnr/bars,_,1

http://localhost:8098/riak/bars/blue_note/beers,tap,1

http://localhost:8098/riak/areas/midtown//bars,tap,_/beers,_,1


http://localhost:8098/riak/areas/midtown/

http://localhost:8098/riak/areas/midtown/

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riak-clientfind me a dnr!


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riak-clientwhat does the Fry have on tap?


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riak-clientin a bottle?


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riak-clientok, via ruby


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riak clientvia ruby with map reduce


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riak-clientmap


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riak-clientmap and reduce


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ripplegem install ripple


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schema design

peoplepeopletweetstweets

riak_20100705riak_20100705

riak_20100704riak_20100704

nosql_20100705nosql_20100705

mongodb_20100705mongodb_20100705


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A Model


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Other Features


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Riak as a Platform


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What’s Coming


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THANKS!http://[email protected]

freenode #riak


mailto:[email protected]

mailto:[email protected]

Riak and Ruby

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