Microsoft Azure Throttling

Windows Azure Throttling

TalentSoft

Windows Azure Throttling

Julien PLEEResponsable R&D

TalentSoft

[email protected], @julplee

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AZURE THROTTLING

What is throttling?

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• Multi-Tenant• Resource Management

– Resource Governance– Resource Limits– Engine Throttling

• Affects multiples services• Sql Database Network

Topology

Windows Azure Sql Database Case

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Windows Azure Sql DatabaseUne seule base de données logique

Plusieurs réplicas

physiques

Primaire unique P

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eu

rs c

ible

s se

con

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es

Réplic

a 1

Réplic

a 2

Réplic

a 3

Pare

-feu

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Soft Throttling

• Throttles the activities of a subset of Sql Databases that consume most resources

Hard Throttling

• Final Stage. • No more connections

are 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>.

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• Worker Threads and Sessions limits• Depends on Web/Business/Premium

mode• Error code differs from Engine

Throttling (10928)

Resource Governance

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• Database Size• Transaction Duration• Transaction Lock Count• tempdb• Transaction Log Length• Memory Usage

Resource Limits

démo

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AZURE THROTTLING

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AZURE THROTTLING

How to solve problems?

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Solutions• Entity Framework 6• Enterprise Library 5.0 Integration

Pack for Windows Azure• More money: Sql Database Premium

Azure Throttling & Transient Fault Handling

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Sql Database Premium

Reservation Size

CPU Cores

Worker Threads

Active Sessions

Disk IO (IOPS)

Memory (GB)

P1 1 200 2000 150 8

P2 2 400 4000 300 16

démo

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AZURE THROTTLING

Manage throttling

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Hello Talent Case: TransactionInterceptor.cspublic 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();}});}

}