Humongous MongoDB
Sean Corfield
World Singles llc
1
Pdf to ppt - Library control class:C# Create PDF from PowerPoint Library to convert pptx, ppt to PDF in C#.net, ASP.NET MVC, WinForms, WPF
Online C# Tutorial for Creating PDF from Microsoft PowerPoint Presentation
www.rasteredge.com
Pdf to ppt - Library control class:VB.NET Create PDF from PowerPoint Library to convert pptx, ppt to PDF in vb.net, ASP.NET MVC, WinForms, WPF
VB.NET Tutorial for Export PDF file from Microsoft Office PowerPoint
www.rasteredge.com
Agenda
Scaling MongoDB - Concepts
Replica Sets & Sharding
Read Preference, Write Concern, Etc
Map/Reduce
Aggregation
2
Library control class:Online Convert PowerPoint to PDF file. Best free online export
Creating a PDF from PPTX/PPT has never been so easy! Web Security. Your PDF and PPTX/PPT files will be deleted from our servers an hour after the conversion.
www.rasteredge.com
Library control class:How to C#: Convert PDF, Excel, PPT to Word
How to C#: Convert PDF, Excel, PPT to Word. Online C# Tutorial for Converting PDF, MS-Excel, MS-PPT to Word. PDF, MS-Excel, MS-PPT to Word Conversion Overview.
www.rasteredge.com
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Me
Functional Programming in the 80's
Object-Oriented Programming in the 90's
Web / Dynamic Programming in the 00's
Mostly Clojure today
4
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Me & MongoDB
Using MongoDB in production (2 years)
Took 10gen "MongoDB for Developers" 
course (Python + MongoDB)
Lead maintainer for Clojure's MongoDB 
wrapper "CongoMongo"
5
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Agenda
Scaling MongoDB - Concepts
Replica Sets & Sharding
Read Preference, Write Concern, Etc
Map/Reduce
Aggregation
6
Scaling Concepts
Master / slave for traditional DBs
One master
One or more slaves
Usually scale "up" not "out"
7
Scaling Concepts
MongoDB replaces "master / slave" with 
"replica set" for failover & load distribution
MongoDB adds sharded clusters to support 
very large data sets - horizontal scale out
8
Replica Set Concepts
A replica set contains any number of 
(mostly) identical nodes
A subset of these vote to elect a primary
All remaining nodes are then secondaries
Writes go to the primary node and 
replicate to the secondary nodes
9
Replica Set Concepts
Reads generally go to the primary node but 
can be performed against secondaries
Per connection or per operation
Can also be targeted to specific nodes
Tagged of nodes and reads
10
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