In this presentation, I show what are the different kind of throttling on the Microsoft Azure cloud platform

1. Windows Azure Throttling

2. Windows Azure Throttling
TalentSoft
Julien PLEE
Responsable R&D
TalentSoft
jplee@talentsoft.com, @julplee

3. AZURE THROTTLING
What is throttling?
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4. Windows Azure Sql Database Case
• Multi-Tenant
• Resource Management
– Resource Governance
– Resource Limits
– Engine Throttling
• Affects multiples services
• Sql Database Network
Topology
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5. Windows Azure Sql Database
Une seule base
de données
logique
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Plusieurs réplicas
physiques
Primaire
unique
Plusieurs cibles
secondaires
Réplica 3 Réplica 2 Réplica 1

6. Soft Throttling
• Throttles the activities of a
subset of Sql Databases that
consume most resources
Hard Throttling
• Final Stage.
• No more connections are
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allowed until resources are
freed up
Engine Throttling
40501: The service is currently busy. Retry the request after 10 seconds.
Incident ID: <ID>. Code: <code>.

7. Resource Governance
• Worker Threads and Sessions limits
• Depends on Web/Business/Premium mode
• Error code differs from Engine Throttling
(10928)
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8. Resource Limits
• Database Size
• Transaction Duration
• Transaction Lock Count
• tempdb
• Transaction Log Length
• Memory Usage
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9. AZURE THROTTLING
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10. AZURE THROTTLING
How to solve problems?
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11. Azure Throttling & Transient Fault Handling
Solutions
• Entity Framework 6
• Enterprise Library 5.0 Integration Pack for
Windows Azure
• More money: Sql Database Premium
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12. Sql Database Premium
Reservation
Size
CPU Cores
Worker
Threads
Active
Sessions
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Disk IO
(IOPS)
Memory
(GB)
P1 1 200 2000 150 8
P2 2 400 4000 300 16

13. AZURE THROTTLING
Manage throttling
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14. Hello Talent Case: TransactionInterceptor.cs
public void Intercept(IInvocation invocation)
{
...
if (Transaction.Current == null)
{
RetryPolicy policy = new RetryPolicy<SqlDatabaseTransientErrorDetectionStrategy>(...);
var transactionOptions = ...
policy.ExecuteAction(
() =>
{
using (var transactionScope = new TransactionScope(...))
{
invocation.Proceed();
transactionScope.Complete();
}
});
}
}
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