Transcript Windows Azure Storage - ACM Symposium on Cloud Computing

Windows Azure Storage
Brad Calder
General Manager
Microsoft Corporation
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BING REALTIME FACEBOOK/TWITTER SEARCH INGESTION ENGINE
Bing Ingestion Engine (Azure Service)
VM
VM
VM
VM
Windows Azure Blobs
Windows Azure Tables
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Blobs, Drives, Tables and Queues
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•
•
•
•
Blobs
Tables
Queues
Drives
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Container
Blobs
https://<account>.blob.core.windows.net/<container>
Account
Table
Entities
https://<account>.table.core.windows.net/<table>
Queue
Messages
https://<account>.queue.core.windows.net/<queue>
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http://<account>.blob.core.windows.net/<container>/<blobname>
Account
Container
images
Blob
PIC01.JPG
cohowinery
PIC02.JPG
videos
VID01.WMV
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Cache-Control, Content-Encoding, Content-Type, etc
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Signed URL
Signing Service
Read/Write
Read-only
Shared Access Signatures
(SAS) share with selected
few clients
Public containers
read-only access to anyone
24 Content Delivery
Network (CDN)
locations
Deliver content
efficiently around the
world
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StorageCredentialsAccountAndKey credentials =
new StorageCredentialsAccountAndKey(accountName, key);
string baseUri = string.Format("http://{0}.blob.core.windows.net", accountName);
CloudBlobClient blobClient = new CloudBlobClient(baseUri, credentials);
// Create Container
CloudBlobContainer cloudContainer = blobClient.GetContainerReference(containerName);
bool hasCreated = cloudContainer.CreateIfNotExist();
// Access Blob in the Container
CloudBlob cloudBlob = cloudContainer.GetBlobReference(blobName);
//BlobRequestOptions has retry policy, timeout etc.
BlobRequestOptions options = new BlobRequestOptions();
//Upload the local file to Blob service
cloudBlob.UploadFile(uploadFileName, options);
//Download to local file name
cloudBlob.DownloadToFile(downloadFileName, options);
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CloudStorageAccount account =
CloudStorageAccount.FromConfigurationSetting("CloudStorageAccount");
//Initialize the local cache for drives mounted by this role instance
CloudDrive.InitializeCache(localCacheDir, cacheSizeInMB);
//Create a cloud drive (PageBlob)
CloudDrive drive = account.CreateCloudDrive(pageBlobUri);
drive.Create(1000 /* sizeInMB */);
//Mount the network attached drive on the local file system
string pathOnLocalFS = drive.Mount(cacheSizeInMB, DriveMountOptions.None);
//Use NTFS APIs to Read/Write files to drive
…
//Snapshot drive while mounted to create backups
Uri snapshotUri = drive.Snapshot();
//Unmount the drive
drive.Unmount();
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http://<account>.table.core.windows.net/<table>(PartitionKey=“...”,RowKey=“...”)
Account
Tables
Entities
customer
Name=Joe
Address =…
cohowinery
order
Name=Tracy
Address =…
Name=Joe
Total=300.00
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PartitionKey
PartitionKey
(Category)
(Category)
RowKey
RowKey
(Title)
(Title)
Timestamp
Timestamp
ReleaseDate
ReleaseDate
Action
Fast
Fast &
& Furious
Furious
…
…
2009
2009
Action
…
…
The Bourne Ultimatum
…
2007
…
…
…
…
…
…
Animation
Animation
Animation
Animation
Open Season 2
Open Season 2
The Ant Bully
The Ant Bully
…
…
…
…
2009
2009
2006
2006
PartitionKey
Comedy
(Category)
Office Space
RowKey
(Title)
…
Office Space
…Timestamp
1999
ReleaseDate
…
…
…
1999
X-Men Origins: Wolverine
…
……
2009
…
SciFi
…
X-Men
Origins: Wolverine
…
……
2009
…
…
War
War
…
Defiance
……
…
2008
Defiance
…
2008
…
Comedy
SciFi
…
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[DataServiceKey("PartitionKey", "RowKey")]
public class Movie
{
/// Movie Category is the partition key
public string PartitionKey { get; set; }
/// Movie Title is the row key
public string RowKey { get; set; }
public DateTime Timestamp { get; set; }
public int ReleaseYear { get; set; }
public double Rating { get; set; }
public string Language { get; set; }
public bool Favorite { get; set; }
}
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string baseUri = string.Format("http://{0}.table.core.windows.net", accountName);
CloudTableClient tableClient = new CloudTableClient(baseUri, credentials);
// Create Movie Table
string tableName = “Movies“;
tableClient.CreateTableIfNotExist(tableName);
TableServiceContext context = tableClient.GetDataServiceContext();
// Add movie
context.AddObject(tableName, new Movie("Action", “White Water Rapids Survival"));
context.SaveChangesWithRetries();
// Query movie
var q = (from movie in context.CreateQuery<Movie>(tableName)
where movie.PartitionKey == "Action" && movie.Rating > 4.0
select movie).AsTableServiceQuery<Movie>();
foreach (Movie movieToUpdate in q)
{
movieToUpdate.Favorite = true;
context.UpdateObject(movieToUpdate);
}
context.SaveChangesWithRetries( SaveChangesOptions.Batch );
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http://<account>.queue.core.windows.net/<queuename>
Account
Queues
thumbnailjobs
Messages
data;http://…
cohowinery
data;http://…
orderprocess
Table=
PartitionKey=x…
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Input Queue (Work Items)
Azure Queue
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Input Queue (Work Items)
Azure Queue
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UPDATE MESSAGE EXAMPLE
Periodically store progress information in message content
Extend visibility timeout with another 5 minutes
Get Message with 5 minutes visibility timeout
7:04
7:00
AM
7:09
7:07AM
Expires
Expires @
@ 7:05AM
7:09AM
Work items
Azure Queue
7:09
7:05
7:14
Retrieve progress from queue
message and resume
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string baseUri = string.Format("http://{0}.queue.core.windows.net", accountName);
CloudQueueClient queueClient = new CloudQueueClient(baseUri, credentials);
//Create Queue
CloudQueue queue = queueClient.GetQueueReference(queueName);
queue.CreateIfNotExist();
//Add Message
CloudQueueMessage message = new CloudQueueMessage(“some content");
queue.AddMessage(message);
//Get Message
message = queue.GetMessage(TimeSpan.FromMinutes(5) /*Invisibility timeout*/);
// Process Message within the Invisibility Timeout
//Delete Message
queue.DeleteMessage(message);
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MessageCount
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Windows Azure Storage Internals and
Geo-Replication
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Design Goals
•
“Windows Azure Storage: A Highly Available Cloud Storage Service with Strong
Consistency”
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Access blob storage via the URL: http://<account>.blob.core.windows.net/
Storage
Location
Service
Data access
LB
LB
Front-Ends
Front-Ends
Partition Layer
Partition Layer
Stream Layer
Intra-stamp replication
Storage Stamp
Inter-stamp (Geo) replication
Stream Layer
Intra-stamp replication
Storage Stamp
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North
Central US
North
Europe
Geo-replication
East Asia
South East
Asia
Geo-replication
Geo-replication
South
Central US
Europe
West
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Microsoft Windows Azure Support
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Data
FE
Committed State
Geo State
Primary Storage Stamp
Data
Partition
Server
Transaction Logs
FE
Committed State
Geo State
Geo-replication Log
Partition
Server
Secondary Storage Stamp
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http://account.blob.core.windows.net/
Hostname
IP Address
account.blob.core.windows.net
North Central
Central US
US
South
Azure
DNS
Update DNS
DNS lookup
Data access
North Central US
Failover
South Central US
Geo-replication
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Access blob storage via the URL: http://<account>.blob.core.windows.net/
Storage
Location
Service
Data access
LB
LB
Front-Ends
Front-Ends
Partition Layer
Partition Layer
Inter-stamp (Geo) replication
Stream Layer
Stream Layer
Intra-stamp replication
Intra-stamp replication
Storage Stamp
Storage Stamp
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Append-only distributed file system
All data from the Partition Layer is stored into files (extents) in the Stream layer
An extent is replicated 3 times across different fault and upgrade domains
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Checksum all stored data
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With random selection for where to place replicas for fast MTTR
Verified on every client read
Scrubbed every few days
Re-replicate on disk/node/rack failure or checksum mismatch
Stream
Layer
(Distributed
File System)
M
M
Paxos
M
Extent Nodes (EN)
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Provide transaction semantics and strong consistency for Blobs, Tables and Queues
Stores and reads the objects to/from extents in the Stream layer
Provides inter-stamp (geo) replication by shipping logs to other stamps
Scalable object index via partitioning
Partition
Master
Lock
Service
Partition Layer
Partition
Server
Partition
Server
Partition
Server
Partition
Server
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Stream
Layer
M
Paxos
M
Extent Nodes (EN)
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Front End
Layer
FE
FE
Stateless Servers
Authentication + authorization
Request routing
FE
FE
FE
Partition
Master
Lock
Service
Partition Layer
Partition
Server
Partition
Server
Partition
Server
Partition
Server
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Stream
Layer
M
Paxos
M
Extent Nodes (EN)
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Incoming Write Request
Ack
Front End
Layer
FE
FE
FE
FE
FE
Partition
Master
Lock
Service
Partition Layer
Partition
Server
Partition
Server
Partition
Server
Partition
Server
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Stream
Layer
M
Paxos
M
Extent Nodes (EN)
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Scalability Targets
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1. Scalability targets of a single storage account
2. Scalability targets for Blobs, Table Entities and Queues within a storage account
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Scalability targets of a single storage account
Account Scalability Targets
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Capacity – Up to 100 TBs
Transactions – Up to 5000 entities per second
Bandwidth – Up to 3 gigabits per second
Partition data across storage accounts to go beyond these targets
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Scalability targets for Blobs, Table Entities and Queues within a storage account
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Single Blob – up to 60MBytes per second
Single PartitionKey in a Table – up to 500 entities per second
Single Queue - up to 500 messages per second
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Windows Azure Storage Summary
• “Windows Azure Storage: A Highly Available Cloud Storage Service with
Strong Consistency”, ACM Symposium on Operating System Principals
(SOSP), Oct. 2011
http://blogs.msdn.com/windowsazurestorage/
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http://www.microsoft.com/windowsazure/free-trial/
Windows Azure
Networking
48
Build a Hello World Application
http://www.microsoft.com/windowsazure/free-trial/
http://www.microsoft.com/windowsazure/sdk/
<?xml version="1.0" encoding="utf-8"?>
<ServiceConfiguration serviceName="MvcApplication1.Azure.ccproj"
xmlns="http://schemas.microsoft.com/ServiceHosting/2008/10/ServiceConfiguration" osFamily="1" osVersion="*">
<Role name="MvcApplication1">
<Instances count="2" />
<ConfigurationSettings>
<Setting name="Microsoft.WindowsAzure.Plugins.Diagnostics.ConnectionString"
value="DefaultEndpointsProtocol=https;AccountName=MyAccount;AccountKey=key" />
</ConfigurationSettings>
</Role>
</ServiceConfiguration>
<?xml version="1.0" encoding="utf-8"?>
<ServiceDefinition name="MvcApplication1.Azure.ccproj" xmlns="http://schemas.microsoft.com/ServiceHosting/2008/10/ServiceDefinition" upgradeDomainCount="2">
<WebRole name="MvcApplication1" vmsize="Small">
<Sites>
<Site name="Web">
<Bindings>
<Binding name="Endpoint1" endpointName="Endpoint1" />
</Bindings>
</Site>
</Sites>
<Endpoints>
<InputEndpoint name="Endpoint1" protocol="http" port="80" />
</Endpoints>
<Imports>
<Import moduleName="Diagnostics" />
</Imports>
</WebRole>
</ServiceDefinition>
http://windows.azure.com
http://windows.azure.com