Cloud Design Patterns

Question 1

Create helper services that send network requests on behalf of a consumer service or application.

Answer 1

Ambassador

Question 2

Implement a façade or adapter layer between a modern application and a legacy system.

Answer 2

Anti-Corruption Layer

Question 3

Decouple backend processing from a frontend host, where backend processing needs to be asynchronous, but the frontend still needs a clear response.

Answer 3

Asynchronous Request-Reply

Question 4

Create separate backend services to be consumed by specific frontend applications or interfaces.

Answer 4

Backends for Frontends

Question 5

Isolate elements of an application into pools so that if one fails, the others will continue to function.

Answer 5

Bulkhead

Question 6

Load data on demand into a cache from a data store.

Answer 6

Cache-Aside

Question 7

Let each service decide when and how a business operation is processed, instead of depending on a central orchestrator.

Answer 7

Choreography

Question 8

Handle faults that might take a variable amount of time to fix when connecting to a remote service or resource.

Answer 8

Circuit Breaker

Question 9

Split a large message into a claim check and a payload to avoid overwhelming a message bus.

Answer 9

Claim Check

Question 10

Undo the work performed by a series of steps, which together define an eventually consistent operation.

Answer 10

Compensating Transaction

Question 11

Enable multiple concurrent consumers to process messages received on the same messaging channel.

Answer 11

Competing Consumers

Question 12

Consolidate multiple tasks or operations into a single computational unit.

Answer 12

Compute Resource Consolidation

Question 13

Segregate operations that read data from operations that update data by using separate interfaces.

Answer 13

Command and Query Responsibility Segregation (CQRS)

Question 14

Deploy multiple independent copies of application components, including data stores.

Answer 14

Deployment Stamps

Question 15

Use an append-only store to record the full series of events that describe actions taken on data in a domain.

Answer 15

Event Sourcing

Question 16

Move configuration information out of the application deployment package to a centralized location.

Answer 16

External Configuration Store

Question 17

Delegate authentication to an external identity provider.

Answer 17

Federated Identity

Question 18

Protect applications and services by using a dedicated host instance that acts as a broker between clients and the application or service, validates and sanitizes requests, and passes requests and data between them.

Answer 18

Gatekeeper

Question 19

Use a gateway to aggregate multiple individual requests into a single request.

Answer 19

Gateway Aggregation

Question 20

Offload shared or specialized service functionality to a gateway proxy.

Answer 20

Gateway Offloading

Question 21

Route requests to multiple services using a single endpoint.

Answer 21

Gateway Routing

Question 22

Deploy backend services into a set of geographical nodes, each of which can service any client request in any region.

Answer 22

Geodes

Question 23

Implement functional checks in an application that external tools can access through exposed endpoints at regular intervals.

Answer 23

Health Endpoint Monitoring

Question 24

Create indexes over the fields in data stores that are frequently referenced by queries.

Answer 24

Index Table

Question 25

Coordinate the actions performed by a collection of collaborating task instances in a distributed application by electing one instance as the leader that assumes responsibility for managing the other instances.

Answer 25

Leader Election

Question 26

Generate pre-populated views over the data in one or more data stores when the data isn’t ideally formatted for required query operations.

Answer 26

Materialized View

Question 27

Break down a task that performs complex processing into a series of separate elements that can be reused.

Answer 27

Pipes and Filters

Question 28

Prioritize requests sent to services so that requests with a higher priority are received and processed more quickly than those with a lower priority.

Answer 28

Priority Queue

Question 29

Enable an application to announce events to multiple interested consumers asynchronously, without coupling the senders to the receivers.

Answer 29

Publisher/Subscriber

Question 30

Use a queue that acts as a buffer between a task and a service that it invokes in order to smooth intermittent heavy loads.

Answer 30

Queue-Based Load Leveling

Question 31

Enable an application to handle anticipated, temporary failures when it tries to connect to a service or network resource by transparently retrying an operation that’s previously failed.

Answer 31

Retry

Question 32

Coordinate a set of actions across a distributed set of services and other remote resources.

Answer 32

Scheduler Agent Supervisor

Question 33

Process a set of related messages in a defined order, without blocking processing of other groups of messages.

Answer 33

Sequential Convoy

Question 34

Divide a data store into a set of horizontal partitions or shards.

Answer 34

Sharding

Question 35

Deploy components of an application into a separate process or container to provide isolation and encapsulation.

Answer 35

Sidecar

Question 36

Deploy static content to a cloud-based storage service that can deliver them directly to the client.

Answer 36

Static Content Hosting

Question 37

Incrementally migrate a legacy system by gradually replacing specific pieces of functionality with new applications and services.

Answer 37

Strangler

Question 38

Control the consumption of resources used by an instance of an application, an individual tenant, or an entire service.

Answer 38

Throttling

Question 39

Use a token or key that provides clients with restricted direct access to a specific resource or service.

Answer 39

Valet Key