Cloud application architecture with sql azure and windows azure

Cloud Application Architecture with SQL Azure and Windows Azure
Dr. Eduardo Castro Martínez
Microsoft MVP
ecastro@mswindowscr.org
http://comunidadwindows.org
http://ecastrom.blogspot.com

Session Objectives
Provide a big-picture view of the SQL Server in the Cloud
Provide a big-picture view of the Windows Azure platform
Describe typical scenarios for using the Windows Azure platform

Agenda
Cloud Computing Platform
Understanding Cloud Computing
Cloud Computing Security
Cloud Computing and Standards
Creating Cloud Aware Applications
Windows Azure Platform

Computing Evolution
40’s
70’s
80’s
Now
Mobility explosion
Collaboration
High level of interconexion between users
Web platform growing
Pressure over companies data centre.
4

Issues Facing Developers
70% of Web Development Effort is “Muck”:
Data Centers
Bandwidth / Power / Cooling
Operations
Staffing
Scaling is Difficult and Expensive:
Large Up-Front Investment
Invest Ahead of Demand
Load is Unpredictable

Solution: Web-Scale Computing
Scale capacity on demand
Turn fixed costs into variable costs
Always available
Rock-solid reliability
Simple APIs and conceptual models
Cost-effective
Reduced time to market
Focus on product & core competencies

The Cloud General concepts

Typical Application Grow?
Users
Unused
capacity
Buy more of everything
Servers
Rearchitect Database to scale out
Buy bigger
SQL Box
Add some Web Servers

Workload Patterns Optimal For Cloud
“On and Off “
“Growing Fast“
Inactivity
Period
Compute
Compute
Average Usage
Usage
Average
Time
Time
On & off workloads (e.g. batch job)
Over provisioned capacity is wasted
Time to market can be cumbersome
Successful services needs to grow/scale
Keeping up w/ growth is big IT challenge
Complex lead time for deployment
“Unpredictable Bursting“
“Predictable Bursting“
Compute
Compute
Average Usage
Average Usage
Time
Time
Unexpected/unplanned peak in demand
Sudden spike impacts performance
Can’t over provision for extreme cases
Services with micro seasonality trends
Peaks due to periodic increased demand
IT complexity and wasted capacity

What is the ‘Cloud’?
The Cloud – metaphor for the internet
‘Cloud Computing’
Exploiting resources ‘out there’
Scalable computational power
Data management and storage
Enabling services
Applications

What is the ‘Cloud’?
The Cloud
“Packaged”
Application
An application that I buy “off the shelf” and run myself
Hosted
“Packaged”
An application that I buy “off the shelf” and run at a host site
“Packaged”
Using cloud services
An application that I buy “off the shelf” and host using cloud platform
“Software as a Service”
A hosted application that I buy as a service from a vendor
Buy
Build vs. Buy
“Custom Built”
Application
An application that I develop and run myself
Hosted
“Custom Built”
An application that I develop myself and run at a host site
“Custom Built”
using cloud services
An application that I develop myself and host using cloud platform
“Platform as a Service”
A vendor hosted development and runtime environment
Build

3 Cloud Service Models
Cloud Software as a Service (SaaS)
Use provider’s applications over a network
Cloud Platform as a Service (PaaS)
Deploy customer-created applications to a cloud
Cloud Infrastructure as a Service (IaaS)
Rent processing, storage, network capacity, and other fundamental computing resources
To be considered “cloud” they must be deployed on top of cloud infrastructure that has the key characteristics
12

Service Model Architectures
13

Cloud App Architecture

High Scale Application Archetype
Intelligent Network Load Balancer
Network Activation
M Tiers of N stateless machines w/ Forward Caching
Stateless ‘Worker’ Machines
Queue Activation
Shared Filesystem
Partitioned Relational DB
Async Dispatch
Queue
‘Monolithic’
State Tier

Cloud aware Architecture
Windows Azure Roles
Client Applications
Silverlight Application
Common Educational Experiences
Service Bus
WCF
Distributed Cache Worker
http:// gagame .*
Dynamic Worker
(tasks uploaded as blobs and sharding)
PartitionerWorker
On PremisesSQL Server
Windows Azure Storage
-- - --- - -
-- - --- - -
Queues for communication between clients and roles
Tables to record server & partition information
Blobs to store web and worker role resources
Configuration
Statistics
C# Application on Premises
SQL Azure
Castellan Venue DB
Castellan Venue DB
Castellan Venue DB
Castellan Venue DB’s
Common DB Tables
Sharding
Partition
Sharding
Partition
Sharding
Partition
...

Sample Cloud Application Architecture
Source: eleniamapi@yahoo.com

Sample Cloud Architecture
Source: eleniamapi@yahoo.com

The ‘Why’ and ‘How’ of Cloud Migration
There are many benefits that explain why to migrate to clouds
Cost savings, power savings, green savings, increased agility in software deployment
Cloud security issues may drive and define how we adopt and deploy cloud computing solutions
19

Balancing Threat Exposure and Cost Effectiveness
20
Private clouds may have less threat exposure than community clouds which have less threat exposure than public clouds.
Massive public clouds may be more cost effective than large community clouds which may be more cost effective than small private clouds.
Doesn’t strong security controls mean that I can adopt the most cost effective approach?

21
Cloud Migration and Cloud Security Architectures
Clouds typically have a single security architecture but have many customers with different demands
Clouds should attempt to provide configurable security mechanisms
Organizations have more control over the security architecture of private clouds followed by community and then public
This doesn’t say anything about actual security
Higher sensitivity data is likely to be processed on clouds where organizations have control over the security model

22
Putting it Together
Most clouds will require very strong security controls
All models of cloud may be used for differing tradeoffs between threat exposure and efficiency
There is no one “cloud”. There are many models and architectures.
How does one choose?

Migration Paths for Cloud Adoption
Use public clouds
Develop private clouds
Build a private cloud
Procure an outsourced private cloud
Migrate data centers to be private clouds (fully virtualized)
Build or procure community clouds
Organization wide SaaS
PaaS and IaaS
Disaster recovery for private clouds
Use hybrid-cloud technology
Workload portability between clouds
23

Possible Effects ofCloud Computing
Small enterprises use public SaaS and public clouds and minimize growth of data centers
Large enterprise data centers may evolve to act as private clouds
Large enterprises may use hybrid cloud infrastructure software to leverage both internal and public clouds
Public clouds may adopt standards in order to run workloads from competing hybrid cloud infrastructures
24

An Overview of the Windows Azure Platform

The Windows Azure Platform
Windows Azure
SQL Azure
Windows Azure platform AppFabric
Developer tools

Windows Azure Basics
Windows Azure can potentially provide various kinds of Windows-based environments
The current release supports both .NET and unmanaged applications
Windows Azure provides Operating System like concepts
Process Management
Computation
Storage

Azure™ Services Platform

A set of connected servers
On which developers can:
Install and run services
Store and retrieve data
What Is The Cloud in Windows Azure?

It is an operating system for the cloud
It is designed for utility computing
It has four primary features:
Service management
Compute
Storage
Developer experience
What Is Windows Azure?

SQL Azure
Cloud
Applications
Windows Azure AppFabric
Windows Azure
On-Premises
Applications
Others
Windows

Windows AzureAn illustration
Application
Compute
Storage
Config
Fabric
…
SQL Azure
Applications
Windows Azure
Applications
Others
Windows

Windows Azure Datacenter
Your Service
Windows Azure Building Blocks
Web Site
(ASPX, ASMX, WCF)
Web Site
(ASPX, ASMX, WCF)
Web Role
(ASPX, WCF)
LB
Tables
Worker Service
Worker Role
Internet
Storage
Queue
LB
Blobs

Windows Azure Applications, Storage, and Roles
n
m
Web Role
Worker Role
LB
Cloud Storage (blob, table, queue)

Windows Azure, In One Picture
Business Portal
Developer Portal
Service Management Service
REST
User Code
…
…
Runtime API
Storage Cluster
VS Tools
Compute Cluster
…
WA SDK
VM Setup
REST
MSFT Datacenters
Desktop
Cloud VM

Azure
Partial Trust
“Dev Fabric”
Dev Environment

Windows Azure Compute Service A closer look
VMs
VMs
HTTP/ HTTPS
Worker
Role Instance
Web
Role Instance
Load Balancer
IIS
Application
Storage
Compute
Fabric
…

Storage
Web Role
Instance
Worker Role
Instance
Fabric Agent
Fabric Agent
Fabric Controller
Windows Azure Fabric

Cloud Simple Application
Worker Role
Web Role
Queue
Blob

Windows Azure for Application Developers
Hosted
Service
Portal
SDK
Storage
Develop
Run
Deploy

Roles
Role
Code
Configuration

Load Balanced Instances
Role
Instance 1
http://yourapp.cloudapp.net
Instance 2

Web vs Worker Role
Worker Role
Web Role
System Host
IIS Host
Your Code
Your Code

Compute

Windows Azure Compute Service
The VMs are provided by a cloud-optimized hypervisor
Not your average VM
They run 64-bit Windows Server 2008
Each VM has a one-to-one relationship with a processor core
For developers:
It’s mostly standard Windows and .NET
A few things require accessing the Windows Azure Agent, e.g., logging
A desktop facsimile of Windows Azure in the cloud is provided for development via the SDK

Windows Azure Compute Service A closer look
VMs
VMs
Worker
Role Instance
Web
Role Instance
HTTP
IIS
Load Balancer
RoleEntryPoint.Start()
Agent
Agent
Windows Azure Fabric
Application
Storage
Compute
Fabric
…

Storage

Windows Azure Storage
Storage types:
Blobs: a simple hierarchy of binary data
Tables: entity storage (not relational tables)
Queues: high performance quasi-transactional queue structures
Access:
Data is exposed via a RESTful interface
Data can be accessed by:
Windows Azure applications
Any other internet connected applicationon-premises or other cloud applications

Windows Azure Storage ServiceA closer look
HTTP/ HTTPS
RESTServices
Blobs
Tables
Queues
Application
Storage
Compute
Fabric
…

Business Analytics
Reporting
Data Sync
Database

SQL AzureA relational DB in the cloud
SQL Azure Database
Data Hub
Others (Future)
Relational database as a service
Highly available, automatically maintained
Extension of the SQL Server Data Platform
.NET Services
SQL Services
Applications
Live Services
Windows Azure
Applications
Windows
Mobile
Windows
Vista/XP
Windows
Server
Others

Database
Relational database, provided as a service
Highly symmetrical development and tooling experience (use TDS protocol and T-SQL)
Highly scaled out, on commodity hardware
Built on the SQL Server technology foundation
Beyond “hosted database”
High availability, DB provisioning, and DB management are provided by the service
Pay for what you use

SQL Azure Database
Highly scaled out relational database as a service
Relational database service
SQL Server technology foundation
Highly symmetrical
Highly scaled
Highly secure
Database “as a Service” – beyond hosting
Browser
Database
SOAP/REST
HTTP/S
ADO.NET/REST - EDM
HTTP/S
MS
Datacenter
Windows Azure
Compute
App Code
(ASP.NET)
SQL Server Report Server
(on-premises)
Customer Value Props
Self-provisioning and capacity on demand
Symmetry w/ on-premises database platform
Automatic high-availability and fault-tolerance
Automated DB maintenance (infrastructure)
Simple, flexible pricing – “pay as you grow”
T-SQL (TDS)
T-SQL (TDS)
SQL Azure
Database
- AD Federation (LiveId /AppFabric AC)

Application Primary FocusDesigning for the Cloud
Fundamentals
Automated
Service
Management
High
Availability
Scale out
Services
Multi-tenancy
Resource Optimization

Transitioning Cloud Driven Process

Transitioning to the cloud
Move Entire Applications to the Cloud
Extend Application Components to the Cloud
Store Data in
the Cloud
Create hybrid applications by Combining
Cloud Services
Start new applications based on
Cloud Services

Migration Paths for Cloud Adoption
Use public clouds
Develop private clouds
Build a private cloud
Procure an outsourced private cloud
Migrate data centers to be private clouds (fully virtualized)
Build or procure community clouds
Organization wide SaaS
PaaS and IaaS
Disaster recovery for private clouds
Use hybrid-cloud technology
Workload portability between clouds
57

Infrastructure Transition

Cloud Reference Architecture
Cloud Computing for Financial Institutions. VivekKejriwal

Transitioning Cloud Driven Architectures

Application Architecture for the Cloud

Application Basic Building Blocks
n
m
Presentation Role
Service Role
LB
Cloud Storage (blob, table, queue)
65

N-Tier Application Transition
Presentation
Business
Move to the cloud
On Premises
Data Access
Data
Data

N-Tier Application Transition
Presentation
Move to the cloud
Business
Move to the cloud
Data
Data Access
Data
On Premises Data
Sync

Simple Cloud Application
Services
Presentation
Queue
Blob

Sample Cloud Application Arquitecture
Cloud Based Roles
Client Applications
Multimedia Application
Common Educational Experiences
Communication Services
Communication Services
Distributed Cache Worker
http:// sophia.*
Dynamic Worker
(blobs and sharding management)
PartitionerWorker
On PremisesData Storage
Cloud Storage
-- - --- - -
-- - --- - -
Queues for communication between clients and roles
Tables to record server & partition information
Blobs to store web and worker role resources
Configuration
Statistics
Application on Premises
Cloud Relational Storage
Castellan Venue DB
Castellan Venue DB
Castellan Venue DB
Common DB Tables
Sharding
Partition
Sharding
Partition
Sharding
Partition
...

Service Bus
2) Discover endpoints
Registry
4) Upgrade to direct connection
1) Register endpoints
3) Access application
Endpoints
Application
Application
Organization X
Organization Y
Access Control
Service Bus
Cloud Communication Pattern

Transitioning to the CloudDesign Requirements

Basic cloud development principles

Cloud Transitioning ArchitectureIdentify Patterns
Consider:
Basic components
Messaging
Interoperable Message Format and Protocols
Communication or Integration Bus
Resource Deployment
Storage
Infrastructure (Processing, Creation, …)

Scaling Out using a Queue Based Pattern
Process Message
Process Role
Submit Message
Queue
Msg 1
Msg 2
Msg 2
Msg 1
Application
Worker Role
Process Role
Msg 3
Msg 4
Msg 2

Table
Incident
Table
Queue A
Alarm
Processor
Pos Rpt
Table
NewMsg
Parse & Route
Event
Table
Timer
Table
Implement Queues for Reliability and Continuity
Processor A
Table
Queue B
Processor B
Table

Building Blocks Key takeaways
Use the cloud provider service configuration to scale
Design how to communicate your application components
Built your application to scale up/down roles in production

Windows Azure Storage Service

Windows Azure Storage ServiceA closer look
HTTP/ HTTPS
Blobs
Tables
Queues
Application
Storage
Compute
Fabric
…

Fundamental Storage Abstractions
Tables– Provide structured storage. A Table is a set of entities, which contain a set of properties
Queues– Provide reliable storage and delivery of messages for an application
Blobs – Provide a simple interface for storing named files along with metadata for the file
Drives – Provides durable NTFS volumes for Windows Azure applications to use (new)
81

Windows Azure StorageTables: Strengths
Massive scalability
By effectively allowing scale-out data
Perspective:
Applied to the right problem, Windows Azure Tables are a beautiful thing
But they’re not the optimal solution for a majority of data storage scenarios
Amazon, Google, and others provide similar cloud storage mechanisms
All of these can be seen as part of the NOSQL movement

Windows Azure StoragePoints of interest
Storage types:
Blobs: store binary data
Tables: provide scale-out, entity-based storage
Not relational tables
Queues: allow message-based communication
Access:
Data is grouped into storage accounts
Data can be accessed by:
Windows Azure apps
Other on-premises or cloud apps

Windows Azure StorageA closer look at blobs
Options for accessing blobs:
From Windows Azure applications or other applications: via RESTful requests
From Windows Azure applications: via Windows Azure Drives
Drives make a blob look like an NTFS file system to the application
Blobs can also be used with the Windows Azure Content Delivery Network (CDN)
For faster access from distributed locations to frequently accessed content

Windows Azure StorageA closer look at tables
. . .
Table
Table
Table
Entity
. . .
Entity
Entity
Storage Accounts
Property
Property
Property
Name
Type
Value

Windows Azure Tables
Provides Structured Storage
Massively Scalable Tables
Billions of entities (rows) and TBs of data
Can use thousands of servers as traffic grows
Highly Available & Durable
Data is replicated several times
Familiar and Easy to use API
ADO.NET Data Services – .NET 3.5 SP1
.NET classes and LINQ
REST – with any platform or language
86

Windows Azure StorageTables: Challenges
No SQL
A new approach for developers to learn
No aggregates
Access via REST
You can’t use ordinary ADO.NET
An unfamiliar structure for data
You can’t easily move relational data in or out
Supporting services are scarce, e.g., reporting
No schema
And no views

Windows Azure StorageA closer look at queues
main()
{ … }
Web Role
Worker Role
1) Receive work
4) Do work
ASP.NET, WCF, etc.
2) Put message in queue
3) Get message from queue
5) Delete message from queue
Queue

Provides Structured Storage
Massively Scalable Tables
Billions of entities (rows) and TBs of data
Can use thousands of servers as traffic grows
Highly Available & Durable
Data is replicated several times
Familiar and Easy to use API
ADO.NET Data Services – .NET 3.5 SP1
.NET classes and LINQ
REST – with any platform or language
90

Table Storage Concepts
Entities
Tables
Accounts
Email =…
Name = …
Users
Email =…
Name = …
moviesonline
Genre =…
Title = …
Movies
Genre =…
Title = …
91

Table Data Model
Table
A storage account can create many tables
Table name is scoped by account
Set of entities (i.e. rows)
Entity
Set of properties (columns)
Required properties
PartitionKey, RowKey and Timestamp
92

Required Entity Properties
PartitionKey & RowKey
Uniquely identifies an entity
Defines the sort order
Use them to scale your application
Timestamp
Read only
Optimistic Concurrency
93

PartitionKey And Partitions
PartitionKey
Used to group entities in the table into partitions
A table partition
All entities with same partition key value
Unit of scale
Control entity locality
Row key provides uniqueness within a partition
94

Partitions and Partition Ranges
Server A
Table = Movies
[Action - Comedy)
Server A
Table = Movies
Server B
Table = Movies
[Comedy- Western)
95

Table Operations
Table
Create
Query
Delete
Entities
Insert
Update
Merge – Partial Update
Replace – Update entire entity
Delete
Query
Entity Group Transaction (new)

Table Schema
Define the schema as a .NET class
[DataServiceKey("PartitionKey", "RowKey")]
publicclassMovie
{
///<summary>
/// Category is the partition key
///</summary>
publicstringPartitionKey { get; set; }
///<summary>
/// Title is the row key
///</summary>
publicstringRowKey { get; set; }
publicDateTime Timestamp { get; set; }
publicintReleaseYear { get; set; }
publicstring Language { get; set; }
publicstring Cast { get; set; }
}
97

Table SDK Sample Code
StorageCredentialsAccountAndKeycredentials = newStorageCredentialsAccountAndKey(
“myaccount", “myKey");
stringbaseUri = "http://myaccount.table.core.windows.net";
CloudTableClienttableClient = newCloudTableClient(baseUri, credentials);
tableClient.CreateTable(“Movies");
TableServiceContextcontext = tableClient.GetDataServiceContext();
CloudTableQuery<Movie> q = (from movie incontext.CreateQuery<Movie>(“Movies")
wheremovie.PartitionKey == “Action" && movie.RowKey == "The Bourne Ultimatum"
select movie).AsTableServiceQuery<Movie>();
MoviemovieToUpdate = q.FirstOrDefault();
// Update movie
context.UpdateObject(movieToUpdate);
context.SaveChangesWithRetries();
// Add movie
context.AddObject(new Movie(“Action" , movieToAdd));
context.SaveChangesWithRetries();
98

Key Selection: Things to Consider
Scalability
Distribute load as much as possible
Hot partitions can be load balanced
PartitionKeyis critical for scalability
Query Efficiency & Speed
Avoid frequent large scans
Parallelize queries
Entity group transactions (new)
Transactions across a single partition
Transaction semantics & Reduce round trips
99

Key Selection: Case Study 1
Table for listing all movies
Home page lists movies based on chosen category
100

Movie Listing – Solution 1
Why do I need multiple PartitionKeys?
Account name as Partition Key
Movie title as RowKey since movie names need to be sorted
Category as a separate property
Does this scale?
101

Single partition - Entire table served by one server
All requests served by that single server
Does not scale
Client
Client
Request
Request
Request
Request
Server A
102

All movies partitioned by category
Allows system to load balance hot partitions
Load distributed
Better than single partition
Server A
Client
Client
Request
Request
Request
Request
Request
Request
Request
Request
Server B
103

Key Selection: Case Study 2
Log every transaction into a table for diagnostics
Scale Write Intensive Scenario
Logs can be retrieved for a given time range
104

Logging - Solution 1
Timestamp as Partition Key
Looks like an obvious choice
It is not a single partition as time moves forward
Append only
Requests to single partition range
Load balancingdoesnot help
Server may throttle
Server A
Applications
Client
Server B
Request
Request
Request
Request
105

Logging Solution 2 - Distribute "Append Only”
Prefix timestamp such that load is distributed
Id of the node logging
Hash into N buckets
Write load is now distributed
Better throughput
To query logs in time range
Parallelize it across prefix values
Server A
Applications
Client
Server B
Request
Request
Request
Request
106

Key Selection: Query Efficiency & Speed
Select keys that allow fast retrieval
Reduce scan range
Reduce scan frequency
107

Single Entity Query
Where PartitionKey=‘SciFi’ and RowKey = ‘Star Trek’
Efficient processing
No continuation tokens
Server A
Client
Request
Server B
Result
108

Table Scan Query
Select * from Movies where Rating > 4
Returns Continuation token
1000 movies in result set
Partition range boundary
Serial Processing: Wait for
continuation token before
proceeding
Returns 1000 movies
Partition range boundary hit
Server A
Cont.
Cont.
Return continuation
Client
Request
Request Cont.
Request Cont.
Server B
Cont.
109

Make Scans Faster
Split “Select * from Movies where Rating > 4” into
Where PartitionKey >= “A” and PartitionKey < “D” and Rating > 4
Where PartitionKey >= “D” and PartitionKey < “I” and Rating > 4
Etc.
Execute in parallel
Each query handles continuation
Server A
Cont.
Cont.
Request
Client
Request
Request
Server B
Cont.
110

Query Speed
Fast
Single PartitionKey and RowKey with equality
Medium
Single partition but a small range for RowKey
Entire partition or table that is small
Slow
Large single scan
Large table scan
“OR” predicates on keys => no query optimization => results in scan
Expect continuation token for all except in 1
111

Make Queries Faster
Large Scans
Split the range and parallelize queries
Create and maintain own views that help queries
“Or” Predicates
Execute individual query in parallel instead of using “OR”
User Interactive
Cache the result to reduce scan frequency
112

Expect Continuation Tokens – Seriously!
Maximum of 1000 rows in a response
At the end of partition range boundary
Maximum of 5 seconds to execute the query
113

Entity Group Transactions (EGT) (new)
Atomically perform multiple insert/update/deleteover entities in same partition in a single transaction
Maximum of 100 commands in a single transaction and payload < 4 MB
ADO.Net Data Service
Use SaveChangesOptions.Batch
114

Key Selection: Entity Group Transaction
Case Study
Maintain user account information
Account ID, User Name, Address, Number of rentals
Maintain information of checked out rentals
Account ID, Movie Title, Check out date, Due date
Solution 1 – Maintain two tables – Users & Rentals
Handle Cross table consistency
Insert into Rentals table succeeds
Update to Users table fails
Queue to maintain consistency
115

Solution 2
Store Account Information and Rental details in same table
Maintain same PartitionKey to enforce transactions
Account ID as PartitionKey
Update total count and Insert new rentals using Entity Group Transaction
Prefix RowKey with “Kind” code: A = Account, R = Rental
Row key for account info: [Kind Code]_[AccountId]
Row Key for rental info: [Kind Code]_[Title]
Rental Properties not set for Account row and vice versa
116

Best Practices
Select PartitionKey and RowKey that help scale
Efficient for frequently used queries
Supports batch transactions
Distributes load
Distribute “Append only” patterns using prefix to PartitionKey
Always Handle continuation tokens
Client can maintain their own cache/views instead of frequent scans
Future Feature - Secondary Index
Execute parallel queries instead of “OR” predicates
Implement back-off strategy for retries
117

Windows Azure Queues
Queue are performance efficient, highly available and provide reliable message delivery
Simple, asynchronous work dispatch
Programming semantics ensure that a message can be processed at least once
Access is provided via REST
118

Queue Storage Concepts
Messages
Queues
Accounts
128 x 128 http://...
thumbnailjobs
256 x 256 http://...
sally
http://...
traverselinks
http://...
119

Account, Queues and Messages
An account can create many queues
Queue Name is scoped by the account
A Queue contains messages
No limit on number of messages stored in a queue
Set a limit for message expiration
Messages
Message size <= 8 KB
To store larger data, store data in blob/entity storage, and the blob/entity name in the message
Message now has dequeue count
120

Queue Operations
Queue
Create Queue
Delete Queue
List Queues
Get/Set Queue Metadata
Messages
Add Message (i.e. Enqueue Message)
Get Message(s) (i.e. Dequeue Message)
Peek Message(s)
Delete Message
121

Queue Programming Api
CloudQueueClientqueueClient = newCloudQueueClient(baseUri, credentials);
CloudQueue queue = queueClient.GetQueueReference("test1");
queue.CreateIfNotExist();
//MessageCount is populated via FetchAttributes
queue.FetchAttributes();
CloudQueueMessage message = newCloudQueueMessage("Some content");
queue.AddMessage(message);
message = queue.GetMessage(TimeSpan.FromMinutes(10) /*visibility timeout*/);
//Process the message here …
queue.DeleteMessage(message);
122

Removing Poison Messages
Producers
Consumers
C1
P2
1. GetMessage(Q, 30 s)  msg 1
2
1
1
1
1
1
2
1
3
4
0
3
0
1
1
2
1
1
0
2
0
C2
P1
123

Producers
Consumers
1
1
C1
P2
5. C1 crashed
4
0
1
1
2
1
3
0
1
2
1
1
1
2
3
6. msg1 visible 30 s after Dequeue
2
1
C2
P1
3. C2 consumed msg 2
4. DeleteMessage(Q, msg 2)
124

Producers
Consumers
1. Dequeue(Q, 30 sec)  msg 1
5. C1 crashed
10. C1 restarted
12. DequeueCount > 2
13. Delete (Q, msg1)
C1
P2
4
0
1
2
3
0
1
3
1
2
1
3
3
1
2
C2
P1
6. msg1 visible 30s after Dequeue
9. msg1 visible 30s after Dequeue
3. C2 consumed msg 2
4. Delete(Q, msg 2)
8. C2 crashed
125

Best Practices & Summary
Make message processing idempotent
No need to deal with failures
Do not rely on order
Invisible messages result in out of order
Use Dequeue count to remove poison messages
Enforce threshold on message’s dequeue count
Use message count to dynamically increase/reduce workers
Use blob to store message data with reference in message
Messages > 8KB
Batch messages
Garbage collect orphaned blobs
126

Storage Summary
Table
Scalable & Reliable Structured Storage System
Partitioning is critical to scalability
Entity Group Transactions (new)
Queue
Scalable & Reliable Messaging System
Dequeue count returned with message (new)
Use back-off strategy on retries
Official Storage Client Library (new)
127

What is “SQL Azure”?

Review – Conceptual model
Subscription
Used to map service usage to the billing instrument
Users may have many subscriptions
Logical Server
Akin to SQL Server Instance
Unit of Geo-Location & Billing
1:1 Subscription & server
User Database
Restricted T-SQL surface area
Additional catalog views provided e.g. sys.billing, sys.firewall_rules, etc

SQL AzureA relational DB in the cloud
SQL Azure Database
Data Hub
Others (Future)
Relational database as a service
Highly available, automatically maintained
Extension of the SQL Server Data Platform
.NET Services
SQL Services
Applications
Live Services
Windows Azure
Applications
Windows
Mobile
Windows
Vista/XP
Windows
Server
Others

SQL Azure Database
Single Logical
Database
Multiple PhysicalReplicas
Replica 1
Single Primary
Replica 2
DB
- Based on SQL Server 2008 R2 engine
Use same tools and data access frameworks
Six global datacenters
High Availability & Redundancy
Reads are completed at the primary
Writes are replicated to a quorum of secondaries
Replica 3
Multiple
Secondaries

Extending SQL Server Data Platform to the Cloud
Data Sync
Reference Data
Database
Symmetric Programming Model
Data Hub Aggregation
Initial services – core RDBMS capabilities with SQL Azure Database, Data Sync
Future Offerings
Additional data platform capabilities: Reporting, BI
New services: Reference Data

The New SQL Data Services
Clear Feedback: “I want a database in the Cloud”
Familiar SQL Server relational model
Uses existing APIs & tools
Built for the Cloud with availability and scale
Accessible to all from PHP, Ruby, and Java
Focus on combining the best features of SQL Server running at scale with low friction

The Evolution of SDS
Evolves
BrowserApplication
Application
Application
BrowserApplication
Application
ODBC, OLEDB, ADO.Net PHP, Ruby, …
REST Client
SQL Client*
REST Client
Cloud
Cloud
Windows Azure
REST (Astoria)
Web App
ADO.Net + EF
REST Client
HTTP+REST
HTTP+REST
HTTP
TDS
HTTP
Windows Azure
Web App
SQL Client*
Data Center
Data Center
TDS + TSQL Model
REST/SOAP + ACE Model
SDS Next
SDS Current
* Client access enabled using TDS for ODBC, ADO.Net, OLEDB, PHP-SQL, Ruby, …

SQL Azure
SQL Azure Database
Others (Future)
SQL Azure
Applications
Windows Azure
Applications
Others
Windows

SQL Azure DatabaseAn Illustration
SQL Azure Database
Database
TDS
Application
Database
Database
SQL Azure Database
Others (Future)

SQL Azure DatabaseUsing one or multiple databases
SQL Azure Database
Database
Application
Max database size is 50 GB
Database
Database
Application
Database

SQL Azure Network Topology
Applications use standard SQL client libraries: ODBC, ADO.Net, PHP, …
Application
Internet
Azure Cloud
TDS (tcp)
Security Boundary
Load balancer forwards ‘sticky’ sessions to TDS protocol tier
LB
TDS (tcp)
Gateway
Gateway
Gateway
Gateway
Gateway
Gateway
Gateway: TDS protocol gateway, enforces AUTHN/AUTHZ policy; proxy to CloudDB
TDS (tcp)
SQL
SQL
SQL
SQL
SQL
SQL
Scalability and Availability: Fabric, Failover, Replication, and Load balancing

TDS Gateway
TDS Listener
Capability negotiation
TDS Packet inspection
Security
Logical->Physical mapping via metadata catalog
Enabler for multi-tenet capabilities
Isolation layer

TDS Gateway Layering
Gateway Process
TDS Endpoint
AdminSvc Endpoint
Provisioning Endpoint
Protocol Parser
Business Logic Services
Connection Mgmt
SQL
SQL
SQL
SQL
SQL
SQL

Provisioning
Subscription
Coordinated across all Azure services
Executed in parallel w/retries
Server
May occur between data centers
Point where Geo-location is established
Database
Always occurs within a single data center
Cross node operations executed during this process e.g. add new db to sys.databases on the master

Server Provisioning
Driven by administrator Portal
Provision request is sent to Gateway
Metadata catalog entry created
DNS record (CNAME) created within LiveDNS service
Master DB created
On completion metadata catalog updated

SQL Azure Server Provisioning
Live DNS Cluster
Customer Browser
Live DNS Svc
Datacenter (Sub-Region)
1
5
Portal LB
Gateway LB
2
4
3
6
Front-end Node
Front-end Node
Front-end Node
Front-end Node
Gateway
Gateway
Admin Portal
Admin Portal
7
Backend Node
Backend Node
Backend Node
SQL Server
SQL Server
SQL Server
Mgmt. Services
Mgmt. Services
Mgmt. Services
Fabric
Fabric
Fabric

Database Provisioning
Gateway performs stateful TDS packet inspection
Picks out subset of messages
Parses out args for create database
Makes entry into Gateway metadata catalog
Unused replica set located and reserved
Replica set (UserDB) is prepped for use
Metadata catalog is updated

SQL Azure Database provisioning
TDS Gateway
1
Front-end Node
Protocol Parser
TDS Session
2
3
Gateway Logic
Master Node
Master Cluster
Master Node Components
4
7
5
6
8
Backend Node 1
Backend Node 2
Backend Node 3
SQL Instance
SQL Instance
SQL Instance
SQL DB
SQL DB
SQL DB

SQL Azure Login Process
Login request arrives at the Gateway
Gateway locates MasterDb & UserDb replica sets
Credentials are validated against MasterDb
TDS session is opened to UserDB and requests are forwarded

SQL Azure Login Process
TDS Gateway
7
1
Front-end Node
Protocol Parser
TDS Session
2
6
Gateway Logic
Master Node
Global Partition Map
Master Node Components
3
8
4
5
Backend Node 1
Backend Node 2
Backend Node 3
SQL Instance
SQL Instance
SQL Instance
SQL DB
SQL DB
SQL DB

Service Resilience
Provisioning
State machines used to coordinate activities across node (and datacenter) boundaries
Failed provisioning attempts cleaned automatically after 10 minutes
Login
Failovers during the login will be transparent (<30 seconds)
Metadata catalog refresh occurs automatically
Active Session
Surface as connection drops (due to state)

Monitoring Service Health
Metrics
Cluster wide performance counters gather key metrics on the service
Used to alert Operations to issues before they become a problem
Early warning system
Code issues
Capacity warnings
Health
Exercises the service routinely looking for problems
When issues are encountered runs deep diagnostics
Network connectivity at the node level
Validate all dependent services (Live DNS, Live ID, etc)
Monitoring from other MSFT DC’s
Validates accessibility from multiple geographic locations
Alerts fired automatically when test jobs fail

Security/Attack Considerations
Service
Secure channel required (SSL)
Denial Of Service trend tracking
Packet Inspection
Server
IP allow list (Firewall)
Idle connection culling
Generated server names
Database
Disallow the most commonly attacked user id’s (SA, Admin, root, guest, etc)
Standard SQL Authn/Authz mode

What’s New In SQL Azure CTPEnhancements
SQL Azure Database
Windows Azure Platform – Developer Portal
Enhanced user experience and reporting
Database manager for SQL Azure
SQL Azure Reporting CTP
Reporting and BI on SQL Azure databases
Based on SQL Server Reporting Services
SQL Azure Data Sync CTP2
Synchronize SQL Azure databases
Synchronize SQL Azure with on-premises SQL Server

What’s New In SQL Azure CTPEnhancements
SQL Azure Database
Database management

Features:
Interactive and tabular reporting
Data visualizations: charts, graphs, mapping, gauges
SQL Azure Database data sources
Utilizes BI Developer Studio (free) to author reports
Export to Excel, PDF, CSV formats
Core scenarios:
Operational reporting on SQL Azure data
Embed reports into Windows Azure or on-premises applications

Web Role
Reporting
“Introduction to SQL Azure Reporting”

What’s New In SQL AzureEnhancements
SQL Azure Database
Database management

Elastic Scale
Service scales as resources requirements grow
No-Code Sync Configuration
Easily define data to be synchronized
Schedule Sync
Choose how often data is synchronized
Conflict Handling
Handle issues where same data is changed in multiple locations
Logging and Monitoring
Administration capabilities for tracking data and monitoring potential issues
CTP 1
CTP 2
“Introduction to SQL Azure Data Sync”

SQL Azure Data Sync – A Closer LookCTP 2
On Premises
Windows Azure
Data Sync Service
Local Agent
Sync Orchestrator
Sync Orchestrator
HTTPS
SQL Server Sync Provider
SQL Server
Proxy Provider
SQL Server
Provider
TDS
SQL Server
SQL Azure

SQL Azure Data Sync – Example Use Cases
Move workloads in stages preserving existing infrastructure
Move part of the application and sync its data
Meet compliance and regulations
Control data synchronized off-premises
Enable scale-out read or read/write
Multiple synchronized databases for scalability
Preserve data – geo replication of data
Enable new scenarios
Spanning enterprise, cloud and remote offices/retail stores

SQL Azure Data Sync – Roadmap
SQL Azure Database
Now
Sync
Sync
Data Sync Service For SQL Azure
Remote Offices
Retail Stores
Sync
Sync
Sync
Sync
Sync
CTP2 – End of CY10
On-Premises (Headquarters)

New SQL Azure Usage Scenarios
Fully featured
Application
Data Sync
Web Role
Reporting

New SQL Azure Usage Scenarios
Fully featured
Application
Globally available,
cloud & on-premises
data synchronization
Data Sync
Data Sync
Geo-replication of data across Windows Azure Platform datacenters
Web Role
Reporting
Corporate Office
Branch Office or Retail
Datacenter
Synchronize multiple on-premises SQL Server databases in different locations

Roadmap
Now
Visit www.microsoft.com/sqlazure to register for upcoming CTP access
2010
New Windows Azure Developer Portal; Database Manager
Limited CTPs of Data Sync CTP2, Reporting CTP
Watch for PDC Announcements; visit the SQL Azure blog and website
2011
Backup & Restore
SQL Azure Reporting
SQL Azure Data Sync

Windows Azure AppFabricInfrastructure in the cloud
Service Bus
Access Control
SQL Azure
Applications
?
Windows Azure
Applications
Others
Windows

Service Bus
3) Discover Service Bus endpoint
1) Register service endpoint
Registry
2) Expose Service Bus endpoint
5) Invoke operation on service endpoint
4) Invoke operation on Service Bus endpoint
Client
(On-premises or cloud)
WCF Service
(On-premises)
Service Bus
Access Control
Illustrating Service Bus

Windows Azure Platform PricingA summary (in US dollars)
Compute: $0.12 to $0.96/hour for each role instance depending on instance size
Storage:
Windows Azure blobs and tables:
Data: $0.15/GB per month
Access: $0.01/10,000 operations
SQL Azure relational:
$9.99/month per GB
Bandwidth:
Americas/Europe: $0.10/GB in, $0.15/GB out
Asia/Pacific: $0.30/GB in, $0.45/GB out

Service Level AgreementsKey points: Windows Azure compute
When you deploy two or more role instances in different fault and upgrade domains, your Internet-facing roles will have external connectivity at least 99.95% of the time
Microsoft will detect within two minutes when a role instance’s process is not running and initiate corrective action

Service Level AgreementsKey points: Windows Azure storage
At least 99.9% of the time, Microsoft will successfully process correctly formatted requests to add, update, read and delete data
At least 99.9% of the time, your storage accounts will have connectivity to Microsoft’s Internet gateway

Service Level AgreementsKey points: SQL Azure database
SQL Azure will maintain a Monthly Availability of 99.9% during a calendar month. Monthly Availability percentage for a specific customer database is the ratio of the time the database was available to customer to the total time in a month. An interval is marked as unavailable if the customer’s attempts to connect to a database are rejected by the SQL Azure gateway.

Using the Windows Azure Platform: Scenarios

Applying Azure (1)Some characteristics of Azure-appropriate applications
Apps that need massive scale
Example: A Web 2.0 application
Apps that need high reliability
Example: A Software as a Service (SaaS) application
Apps with variable load
Example: An on-line ticketing application
Apps with a short or unpredictable lifetime
Example: An app created for a marketing campaign

Applying Azure (2)Some characteristics of Azure-appropriate applications
Apps that do parallel processing
Example: A financial modeling application
Apps that must fail fast or scale fast
Example: Start-ups
Apps that don’t fit well in an organization’s data center
Example: A business unit that wishes to avoid its IT department
Apps that can benefit from external storage
Example: An application that archives data

Building on AzureA non-Azure app using Windows Azure storage
Blobs
SQL Azure
On-Premises or Hosted Application

Building on Azure A massively scalable web app exposed on the public Internet
Tables
Web Role
Instance
Users

Building on Azure A massively scalable web app with background processing
Tables
Blobs
Queues
Web Role
Instance
Worker Role
Instance
Users

Building on Azure A web app with relational storage
SQL Azure
Web Role
Instance
Users

Building on Azure A web app using cloud and on-premises data
SQL Azure
Web Role
Instance
Service Bus
On-premises Database
Users

Building on Azure A parallel processing application
Blobs
Queues
Worker Role
Instance
Web Role
Instance
User

Developer Experience
Use existing skills and tools.
platform
Relational data
Management
AppFabric
Compute
Storage
Management
CDN
Connectivity
Access control

Conclusions
Cloud platforms are here
Microsoft is placing a big bet with the Windows Azure platform
A new world is unfolding
Prepare to be part of it

Related Content
Comunidad Windows
http://www.slideshare.net/ecastrom
Introducing the Windows Azure Platform
http://go.microsoft.com/fwlink/?LinkId=158011
Introducing Windows Azure
http://go.microsoft.com/?linkid=9682907

Presentation SourcesResources
SQL Azure website:
http://www.microsoft.com/sqlazure
Blog:
http://blogs.msdn.com/sqlazure
Dev Center:
http://msdn.microsoft.com/windowsazure/sqlazure
Frameworks:
http://msdn.microsoft.com/data

An Introduction to the Windows Azure Platform
Dr. Eduardo Castro Martínez
Microsoft MVP
ecastro@mswindowscr.org

© 2010 Microsoft Corporation. All rights reserved. Microsoft, Windows, Windows Vista and other product names are or may be registered trademarks and/or trademarks in the U.S. and/or other countries.
The information herein is for informational purposes only and represents the current view of Microsoft Corporation as of the date of this presentation. Because Microsoft must respond to changing market conditions, it should not be interpreted to be a commitment on the part of Microsoft, and Microsoft cannot guarantee the accuracy of any information provided after the date of this presentation. MICROSOFT MAKES NO WARRANTIES, EXPRESS, IMPLIED OR STATUTORY, AS TO THE INFORMATION IN THIS PRESENTATION.

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Cloud application architecture with sql azure and windows azure

by Eduardo Castro on Aug 06, 2011

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Cloud application architecture with sql azure and windows azure — Presentation Transcript