Cloud Computing

This example of cloud computing system architecture diagram was created on base of the figure "Workflow to distribute workitems to pooled VMs" in the article "Azure Batch technical overview" from the Microsoft Azure website.
"Workitems workflow.
Figure 4 shows a you how to submit an application to a pool where it's distributed for processing. This uses the Batch API. ...
1. Upload input files (such as source data or images) required for a job to an Azure storage account. These files must be in the storage account so that the Batch service can access them. The Batch service loads them onto a TVM when the task runs.
2. Upload the dependent binary files to the storage account. The binary files include the program that is run by the task and the dependent assemblies. These files must also be accessed from storage and are loaded onto the TVM.
3. Create a pool of TVMs, specifying the size of the TVMs in the pool, the OS they run, and other properties. When a task runs, it is assigned a TVM from this pool.
4. Create a workitem. A job will be automatically created when you create a workitem. A workitem enables you to manage a job of tasks.
5. Add tasks to the job. Each task uses the program that you uploaded to process information from a file you uploaded.
6. Run the application and monitor the results of the output." [azure.microsoft.com/ en-us/ documentation/ articles/ batch-technical-overview/ ]
The diagram example "Workitems workflow diagram" was created using ConceptDraw PRO diagramming and vector drawing software extended with the Azure Architecture solution from the Computer and Networks area of ConceptDraw Solution Park.

This Azure cloud architecture pattern diagram template was created on the base of figure in the article "Valet Key Pattern" from the Microsoft Developer Network (MSDN) website.
"Valet Key Pattern.
Use a token or key that provides clients with restricted direct access to a specific resource or service in order to offload data transfer operations from the application code. This pattern is particularly useful in applications that use cloud-hosted storage systems or queues, and can minimize cost and maximize scalability and performance. ...
Client programs and web browsers often need to read and write files or data streams to and from an application’s storage. ...
Data stores have the capability to handle upload and download of data directly, without requiring the application to perform any processing to move this data, but this typically requires the client to have access to the security credentials for the store.
... applications must be able to securely control access to data in a granular way, but still reduce the load on the server by setting up this connection and then allowing the client to communicate directly with the data store to perform the required read or write operations. ...
To resolve the problem of controlling access to a data store where the store itself cannot manage authentication and authorization of clients, one typical solution is to restrict access to the data store’s public connection and provide the client with a key or token that the data store itself can validate.
This key or token is usually referred to as a valet key. It provides time-limited access to specific resources and allows only predefined operations such as reading and writing to storage or queues, or uploading and downloading in a web browser. Applications can create and issue valet keys to client devices and web browsers quickly and easily, allowing clients to perform the required operations without requiring the application to directly handle the data transfer. This removes the processing overhead, and the consequent impact on performance and scalability, from the application and the server." [msdn.microsoft.com/ ru-RU/ library/ dn568102.aspx]
The Azure cloud system architecture diagram template "Valet key pattern" for the ConceptDraw PRO diagramming and vector drawing software is included in the Azure Architecture solutin from the Computer and Networks area of ConceptDraw Solution Park.

This Azure cloud architecture pattern diagram template was created on the base of figure in the article "Scheduler Agent Supervisor Pattern" from the Microsoft Developer Network (MSDN) website.
"Scheduler Agent Supervisor Pattern.
Coordinate a set of actions across a distributed set of services and other remote resources, attempt to transparently handle faults if any of these actions fail, or undo the effects of the work performed if the system cannot recover from a fault. This pattern can add resiliency to a distributed system by enabling it to recover and retry actions that fail due to transient exceptions, long-lasting faults, and process failures. ...
An application performs tasks that comprise a number of steps, some of which may invoke remote services or access remote resources. The individual steps may be independent of each other, but they are orchestrated by the application logic that implements the task.
Whenever possible, the application should ensure that the task runs to completion and resolve any failures that might occur when accessing remote services or resources. ...
If the application detects a more permanent fault from which it cannot easily recover, it must be able to restore the system to a consistent state and ensure integrity of the entire end-to-end operation. ...
The Scheduler Agent Supervisor pattern defines the following actors. These actors orchestrate the steps (individual items of work) to be performed as part of the task (the overall process):
- The Scheduler arranges for the individual steps that comprise the overall task to be executed and orchestrates their operation. ...
- The Agent contains logic that encapsulates a call to a remote service, or access to a remote resource referenced by a step in a task. ...
- The Supervisor monitors the status of the steps in the task being performed by the Scheduler. ...
The Scheduler, Agent, and Supervisor are logical components and their physical implementation depends on the technology being used." [msdn.microsoft.com/ ru-RU/ library/ dn589780.aspx]
The Azure cloud system architecture diagram template "Scheduler agent supervisor pattern" for the ConceptDraw PRO diagramming and vector drawing software is included in the Azure Architecture solutin from the Computer and Networks area of ConceptDraw Solution Park.