Google Cloud Certified Professional Cloud Architect Study Guide. Dan Sullivan

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СКАЧАТЬ not some kind of unnecessary filler in the case studies. They provide the broad context in which a solution will be developed. While they do not provide enough detail to identify solution components on their own, they do help us narrow the set of feasible technical solutions. Business requirements may help you rule out options to an exam question. For example, a data storage solution that distributes data across multiple regions by default may meet all technical requirements, but if a business requirement indicates the data to be stored must be located in a specific country, then the correct answer is the one that lets you limit where the data is stored.

Application Design and Cost Considerations

      In addition to specifying business and product strategy, business requirements may state things that you should consider in application design, such as a preference for managed services and the level of tolerance for disruptions in processing. Implicit in business requirements is the need to minimize costs while meeting business objectives.

One measure of costs is total cost of ownership (TCO). TCO is the combination of all expenses related to maintaining a service, which can include the following:

       Software licensing costs

       Cloud computing costs, including infrastructure and managed services

       Cloud storage costs

       Data ingress and egress charges

       Cost of DevOps personnel to develop and maintain the service

       Cost of third-party services used in an application

       Charges against missed service-level agreements

       Network connectivity charges, such as those for a dedicated connection between an on-premises data center and Google Cloud

      While you will want to minimize the TCO, you should be careful not to try to minimize the cost of each component separately. For example, you may be able to reduce the cost of DevOps personnel to develop and maintain a service if you increase your spending on managed services. Also, it is generally a good practice to find a feasible technical solution to a problem before trying to optimize that solution for costs.

      Some of the ways to reduce costs while meeting application design requirements include managed services, using preemptible virtual machines, and data lifecycle management. Google also offers sustained uses discounts and reserved VMs, which can help reduce costs.

      Managed Services

      Managed services are Google Cloud Platform services that do not require users to perform common configuration and maintenance operations. For example, Cloud SQL is a managed relational database service providing MySQL, SQL Server, and PostgreSQL databases. Database administration tasks, such as backing up data and patching operating systems, are performed by Google and not by customers using the service. Managed services are good options in the following cases:

       Users do not need low-level control over the resources providing the service, such as choosing the operating system to run in a VM.

       Managed services provide a functionality that would be difficult or expensive to implement, such as developing a machine vision application.

       There is little competitive advantage to performing resource management tasks. For example, the competitive advantage that may come from using Apache Spark for analytics stems from the algorithms and analysis methodologies, not from the administration of the Spark cluster.

Architects do not necessarily need to know the details of how managed services work. This is one of their advantages. Architects do not need to develop an expertise in natural language processing to use the Natural Language AI, but they do need to understand what kinds of functions managed services provide. See Table 2.1 for brief descriptions of some of the Google Cloud Platform managed services.

TABLE 2.1 Examples of Google Cloud Platform managed services

Service Name	Service Type	Description
AutoML Tables	AI and machine learning	Machine learning models for structured data
Recommendations AI	AI and machine learning	Personalized recommendations
Natural Language AI	AI and machine learning	Entity recognition, sentiment analysis, and language identification
Cloud Translation	AI and machine learning	Translate between languages
Cloud Vision	AI and machine learning	Understand contents of images
Dialogflow Essentials	AI and machine learning	Development suite for voice and text conversational apps
BigQuery	Analytics	Data warehousing and analytics
Cloud Datalab	Analytics	Interactive data analysis tool based on Jupyter Notebooks
Dataproc	Analytics	Managed Hadoop and Spark service
Cloud Data Fusion	Data management	Data integration and ETL tool
Data Catalog	Data management	Metadata management service
Dataflow	Data management	Stream and batch processing
Cloud Spanner	Database	Global relational database
Cloud SQL	Database	Regional relational database
Cloud Deployment Manager	Development	Infrastructure-as-code service
Cloud Pub/Sub	Messaging	Messaging service
Cloud Composer	Orchestration	Data workflow orchestration service
Bigtable	Storage	Wide column, NoSQL database
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