Data Modeling with Cassandra Column Families

Needle Meet HaystackAdapting your data models for Cassandra
Gary Dusbabek • Rackspace• ICOODB 2010

Outline
First Things First
Column Families
Trade Offs
Procedures & Best Practices
Internals

It’s all about scalability

We can all be friends

Column Families

2.TradeOffs

No Transactions

No
Adhoc Queries

No Joins

No Flexible Indexes

Don’t
Panic!

Scalability
Availability
Replication & Backup

3. Procedures & Practices

Relational Way
Define entities
Normalize
Identify Many-to-many
Query any way you want

How Come?
Scarcity
Efficiency

Cassandra Way
Know your app
Queries first
Denormalize

Know Your App

Queries First

Nobody is Normal

Relational Example

Column Family Example

Does it feel strange?

4. Internals

Sequential Writes
Always

Consistency Level

Partitioning

Slices
Data Locality

Summary
The goal is to scale
ColumnFamilies != Relational tables
Trade-offs: you win some, you lose some
Know your application
Queries first
Denormalization is OK
Cassandra was built for this

Links
http://cassandra.apache.org
http://wiki.apache.org/cassandra
irc: #cassandra on freenode
gdusbabek@gmail.com
@gdusbabek

Image Credits
haystack http://www.flickr.com/photos/james_lumb/3921968993
pyramids http://www.flickr.com/photos/gracewong/93631410
scales http://www.flickr.com/photos/eflon/3465042138
friends http://www.flickr.com/photos/ngmmemuda/4166182931
television http://www.flickr.com/photos/angelrravelor/314306023
columns http://www.flickr.com/photos/nostri-imago/3564300653
devil http://www.flickr.com/photos/52890443@N02/4887855756
angel http://www.flickr.com/photos/75001512@N00/4938623021
transaction http://www.flickr.com/photos/neubie/2273635564
queries http://www.flickr.com/photos/-bast-/349497988
rings http://www.flickr.com/photos/baldur/4395738741
indexes http://www.flickr.com/photos/waferboard/4137041591
panic http://www.flickr.com/photos/pasukaru76/3998981988
procedures "The Anatomy Lesson of Dr. NicolaesTuip" by Rembrandt
relational http://www.flickr.com/photos/35536700@N07/3292544674
desert http://www.flickr.com/photos/waldenpond/4252575735
jet http://www.flickr.com/photos/rmahle/709685
queries http://www.flickr.com/photos/andreanna/2812118063
blackboard http://www.flickr.com/photos/shonk/418180402
normal http://www.flickr.com/photos/infrogmation/3180606117
phonograph http://www.flickr.com/photos/shiyazuni/4770244591
dodo http://www.flickr.com/photos/wheatfields/2071347416
Internals http://www.flickr.com/photos/37hz/4057856826
writing http://www.flickr.com/photos/stevendepolo/3877225152
consistency http://www.flickr.com/photos/betsyweber/4962297050
partitioning http://www.flickr.com/photos/featheredtar/3137028766
slices http://www.flickr.com/photos/free-stock/4899674517
summary http://www.flickr.com/photos/jkdsphotography/4061838798
links http://www.flickr.com/photos/creative_stock/3397559016

http://nosql.mypopescu.com	1184
http://www.nosqldatabases.com	410
http://translate.googleusercontent.com	4
http://www.twylah.com	1

Data Modeling with Cassandra Column Families

by gdusbabek on Sep 29, 2010

Accessibility

Categories

Upload Details

Usage Rights

4 Embeds 1,599

Statistics

Data Modeling with Cassandra Column Families Presentation Transcript