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RoleEnvironmentTopologyChange Class

Updated: October 25, 2013

Represents a change to the topology of a role.

Namespace: Microsoft.WindowsAzure.ServiceRuntime
Assembly: Microsoft.WindowsAzure.ServiceRuntime (in Microsoft.WindowsAzure.ServiceRuntime.dll)

public class RoleEnvironmentTopologyChange : RoleEnvironmentChange, IEquatable<RoleEnvironmentTopologyChange>

The topology refers to the number of instances and the number of endpoints that are defined for a role. For more information about service definitions, see Windows Azure Service Definition Schema.

At least one internal endpoint must be defined for a role in order to raise a RoleEnvironmentTopologyChange. For more information about defining endpoints, see Enable Communication for Role Instances in Windows Azure.

It is highly recommended that you configure the cloud service to run at least two instances of the role. When you deploy two or more role instances in different fault and upgrade domains, your Internet facing roles have external connectivity at least 99.95% of the time. For more information, see Service Level Agreements.


Any public static (Shared in Visual Basic) members of this type are thread safe. Any instance members are not guaranteed to be thread safe.

Development Platforms

Windows Vista, Windows 7, Windows Server 2008, Windows 8.1, Windows Server 2012 R2, Windows 8 and Windows Server 2012

Target Platforms

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