Josh Twist If you steal it please provide credit and a link to httpwwwthejoyofcodecomcloudartworkaspx CLOUDS GUIDs and HOUNDS Josh Twist Principal ADM Premier Support for Developers ID: 309187
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Slide1
All artwork on this slide deck created by
Josh Twist
. If you steal it please provide credit and a link to
http://www.thejoyofcode.com/cloud_artwork.aspx
Slide2
CLOUDS,
GUIDs and HOUNDSJosh TwistPrincipal ADMPremier Support for Developers (PSfD)Microsoft UK
www.thejoyofcode.com
@
joshtwist
jtwist@microsoft.comSlide3
The Scenario
Predictable BurstingSlide4
High level stuff you already know
Web Roles
Worker Roles
Table Storage
Blob Storage
SQL AzureSlide5
The Architecture
Push
Pull
Push
LOTS of usersSlide6
Problem 1: Seriously? A
guid?Internet Explorer 9Slide7
Possible Solutions
Use SQL Azure
Create a global counter
Configure Partitions
0-1,000,000
1,000,001
- 2,000,000
2,000,001
- 3,000,000Slide8
The problem(s) with configuration
X
X
XSlide9
Our Solution
R = 1,000
R
= 1,000
Write back new max identifier where
eTag
is the same.
Request current max identifier
3,000
eTag
= XCV243987243KDSlide10
Nice!
Rate of requests to storage = Rate of requests / R(not related to the number of nodes)Entirely self managingProduces relatively sequential identifiersIncredibly fastConfiguration can be modified at runtime if necessarySlide11
Problem 2: Release the Hounds!Slide12
Solution 1: Polling
Poll
Poll
Poll
Unleash!
Go!Slide13
Polling Approach
ProsConsEasy PeasyPolling always feels a bit… ‘naff’?CheapInherent latency (up to T)Slide14
Solution 2: Listening
Connect
Connect
Connect
Unleash!
Unleash!
Unleash!
Unleash!Slide15
Listening Approach
ProsConsDirect! Feels good.Costs money to open connections from your ‘n’ nodesNo Latency?Actual LatencyNo state. A freshly provisioned node could miss the ‘unleash’ signal.Slide16
Thanks!
This story will feature in November’s MSDN magazinewww.thejoyofcode.com@joshtwist
jtwist@microsoft.com
Want to know more about
PSfD
? Mail me.
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