Transcript SYMP06: Cloud No Cloud The Law Of Physics Still Apply

SYMP06
 Gianpaolo Carraro
Platform Architecture Team
Microsoft Corporation
A Journey through multiple perspectives
Business: Why?
Expanding Applications
to the Cloud
Session 3
Cloud or No Cloud, the
Laws of Physics Still
Apply
Making Enterprise
Grade Cloud
Applications
Session 1
Session 2
Architecture: What/When?
Code: How?
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RATING
DG 13
Developers Strongly Cautioned
Limited Visual Studio Wizardry
Some Excel Spreadsheet Usage
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Clearly Owning the pipe can offer an competitive advantage
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- Multicast and/or Peer to Peer top N (50?) movies
- Use non IP network (e.g., cable for distribution)
- End user read off local cache
Movie
Service
source: http://www.telegeography.com/products/ip_transit/index.php
Source: http://www.dtc.umn.edu/mints/home.php
(mean time between failure)
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failure rate
"infant mortality" phase
"wearout" phase
"constant failure rate"
time
MTBF = 1/constant failutre rate
(does not take into account wear out phase, hence is not relevant for lifetime of a
single component but very useful for average failure of many component)
Example: A 30 years old in USA has a failure (death) rate of ~1.1 per 1000
MTBF of 900 years (actually person-years per death)
Even the super healthy, organic eating person won’t reach that -> wear out phase
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Consistency
Availability
tolerance to network
Partition
CAP
•
–
A
C
•
Consistency + Availability
• Single site / Cluster database
•
Consistency + Partition
• Distributed database / Distributed locking
•
Availability + Partition
• Distributed cache/ DNS
P
A
C
P
A
C
P
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architecture
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Sometimes,
It’s OK to be wrong or down
Compare cost of the apology vs. cost of knowing for sure
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GOOD!
Not
so much!
“Exposed” for 22 months
Ouch!!
Still
Ouch!!
Break Even
but < 1%
churn!?
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Rich Client Software
French Lecturer
Using a US-based Server
Hosting 3rd Party Service
Visiting China
• Whose law applies where?
• What’s encrypted, and when?
• Who retains what information, and for how long?
• How does copyright apply to cached copies?
Caching data in
Japan
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