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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. CLOUDS, GUIDs and HOUNDS Josh Twist Principal ADM Premier Support for Developers ( PSfD ) Microsoft UK. [email protected]. - PowerPoint PPT Presentation
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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
CLOUDS, GUIDs and HOUNDS
Josh TwistPrincipal ADM
Premier Support for Developers (PSfD)Microsoft UK
www.thejoyofcode.com@joshtwist
The ScenarioPredictable
Bursting
High level stuff you already know
Web Roles Worker Roles
Table Storage Blob Storage SQL Azure
The Architecture
Push
LOTS of
users
Problem 1: Seriously? A guid?
Internet Explorer 9
Possible SolutionsUse SQL
Azure
Create a global counter
Configure Partitions0-
1,000,000
1,000,001 -
2,000,000
2,000,001 -
3,000,000
The problem(s) with configuration
XXX
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 = XCV243987243KD
Nice!• Rate of requests to storage = Rate of
requests / R(not related to the number of nodes)
• Entirely self managing• Produces relatively sequential
identifiers• Incredibly fast• Configuration can be modified at
runtime if necessary
Problem 2: Release the Hounds!
Solution 1: Polling
Poll
Poll
Poll
Unleash!
Go!
Polling ApproachPros Cons
Easy Peasy Polling always feels a bit… ‘naff’?
Cheap Inherent latency (up to T)
Solution 2: ListeningConne
ct
Connect
Connect
Unleash!
Unleash!
Unleash!
Unleash!
Listening Approach
Pros ConsDirect! Feels good.
Costs money to open connections from your ‘n’ nodes
No Latency? Actual LatencyNo state. A freshly provisioned node could miss the ‘unleash’ signal.
Thanks!
This story will feature in November’s MSDN magazine
www.thejoyofcode.com@joshtwist
Want to know more about PSfD?
Mail me.
Any Qs? Get me on
