Request path

As explained in Cloud Observability in Action

A request path is the sequence of components and service interactions through which an individual request travels.

A request path is the sequence of components and service interactions that process one request, from the user-facing entry point through completion or termination. section 8.1.1

E-commerce checkout

After a customer selects Purchase, the frontend calls checkout. Checkout queries the items store, invokes fraud detection, obtains shipping costs, gathers billing information, calls an external payment provider, and updates inventory. Invalid input or an external timeout can terminate the path before completion. section 8.1.1

Distributed tracing makes request paths inspectable as dynamic service maps, allowing operators to drill into actual interactions without manually correlating timestamped log events. Costs include instrumentation, agents, sampling, latency, storage, retention, and query overhead. section 2.5.3

Figure 8.2 A single request path in the app

Use the component diagram to follow the checkout path across services. section 8.1.1

Figure 8.3 A single request path in the app, as a temporal (waterfall) visualization

Use the waterfall view to examine the path’s temporal ordering and overlapping service work. section 8.1.1

How Cloud Observability in Action covers it

How deep it goes

Maps component interactions, termination points, and temporal ordering while deferring implementation details of tracing backends.

Examples

Illustrates checkout through frontend, checkout, data, fraud, shipping, billing, payment, and inventory services.

What it assumes

Assumes familiarity with microservices and service interactions while establishing request-path terminology through checkout.

What you can do after

Diagnose request behavior by following service interactions and examining trace paths instead of manually correlating logs.

How it connects

Connects request paths to microservices, distributed tracing, service maps, dependency graphs, and waterfall visualizations.

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Related concepts

• pathkind of · A path is an ordered sequence of connected elements representing a route through a graph, structure, or space.
• microservice architecturehas part · Microservice architecture is a software architectural style that organizes an application as independently deployable services with focused responsibilities that communicate through defined interfaces.

This explainer was generated by Manning's knowledge graph from the text of Cloud Observability in Action. The section links point to the parts of the book it draws on.