Migrating an Enterprise Microsoft Product (TFS)

on to Windows AzureSriram Dhanasekaran

SDE II, Microsoft

Agenda

• Microsoft Visual Studio Team Foundation Server 2010 – Architecture

• Migration – steps and challenges• Lessons–What aspects made the migration easier?

• Demo• Q&A

MICROSOFT VISUAL STUDIO TEAM FOUNDATION SERVER 2010

TFS 2010 - Architecture

TFS on AzureWindows Azure

Web RoleWeb Role

SQL AzureSQL AzureWorker RoleWorker Role

VM/Worker Role*VM/Worker Role*

* Not in current release

MIGRATION

SQL Server => SQL Azure

• No OPENXML–Moved to using TVP instead.

• No ‘SELECT INTO’• No SysMessages– Developed own mechanism

• Mandatory Clustered Indexes• No full text index

Identities

• No Windows Identities in Azure. Need to use internet identity system.

• Use App Fabric Access Control Services as federation system– Open ID compatible– Multiple providers – Live, Yahoo, Google,

Facebook– Supports Active Directory Federation– Provides service identities for various co-

operative services to authenticate each other.• Clients now need to prompt a web page to

accept credentials

Storage

• In On-premise version, all data was stored in SQL Server – work item attachments, source code files, test attachments

• Disadvantages of SQL Azure– Cap on size of database– About x50 expensive

• Moved all blob data to Windows Azure Blob Storage.– Cheap– Scalable

Communication Protocol

• Made all components behave like pure clients– Having no peer-peer relationship

enables simple trust relationship– Allows easy support for multiple

topologies

Security

• Centralized authentication and authorization system– Server handles all security aspects– Enables simpler trust relationships– Data hidden

Tuning for WAN access

• TFS always on WAN– Think hard on hitting the server– Calls to server needs to be Async and

cancellable–Minimize round trip, payload etc.,• Streaming data• Offline cache• Compression

Running as a service

• COGS– Storage– Bandwidth

• Upgrade– No downtime– Upgradeable at a tenant level– Client upgrades

• Diagnostics• Operations team becomes an integral part

of product team• Billing

LESSONS LEARNT

What makes migration simpler?

• Web friendly protocols– ASP.NET web services– WCF

• Stateless services• 3-tier application model.• Support for scaling any tier

independently.• Multi-tenant notion– Unit of operation– Delegation of administration

DEMO

TFS on Azure

Q & A

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