A system is serving high availability. In this context, from the viewpoint of a gateway, when should a request be re-routed?

Question

BlackTom AI · Accepted Answer

In this question about high-availability behavior from a gateway perspective, we must evaluate each scenario to determine when rerouting makes sense.
Option a: 'When a cache replica or partition is not available' — The unavailability of a cache replica or partition is typically a cache-layer concern. While it might cause a slower response or a cache miss, it does not automatically imply that the gateway should reroute to a different service instance, especially if the underlying service is still healthy and capable of serving requests. Rerouting is usually reserved for failures or degraded health in the service path, not purely cache-layer outages. Therefore, this is not consistently a trigger for re-routing.
Option b: 'When a request to a service fails' — This aligns with a core HA principle: if the target service cannot fulfill the request due to failure, the gateway should reroute to another healthy instance or failover target to maintain availability. This is a direct reason to re-route because the current route cannot satisfy the user’s request.
Option c: 'When an HTTP 204 - No Content was received' — HTTP 204 indicates a successful request with no payload. It is not an error condition and does not imply that the gateway should re-route. Rerouting would not be warranted on receiving a 204 in normal operation, since the response is valid.
Option d: 'When an HTTP 408 - Request Timeout was received' — A 408 indicates the client’s request timed out before the server could respond. This is typically treated as a failure to complete the request in time, which justifies attempting an alternate path or replica to fulfill the request, so rerouting is appropriate in this scenario.
In summary, rerouting is generally triggered by actual failures or timeouts in serving the request (options b and d), while cache-only issues or a normal 204 response do not inherently require rerouting. It's important to distinguish between transient cache behavior and end-to-end service health when deciding to re-route.

Dashboard FAF.PAD21.1 Programarea aplicațiilor distribuite

A system is serving high availability. In this context, from the viewpoint of a gateway, when should a request be re-routed?

View Explanation

Log in for full answers

Similar Questions

In a consumer society, many adults channel creativity into buying things

Economic stress and unpredictable times have resulted in a booming industry for self-help products

People born without creativity never can develop it

A product has a selling price of $20, a contribution margin ratio of 40% and fixed cost of $120,000. To make a profit of $30,000. The number of units that must be sold is: Type the number without $ and a comma. Eg: 20000

Which of the following statement regarding cost is correct:

Under the assumptions used in cost-volume-profit analysis, as the activity increases:

The CVP and break-even analysis are supported by a range of important assumptions. Which of the following is not an assumption of the CVP:

The break-even point is that at which:

More Practical Tools for Students Powered by AI Study Helper

Homework AI Solver

Stylized AI Paper Writer

Plagiarism Checker Assistant

Citation AI Academic Writing Tool

In-Class Translation Assistant

AI Note Generator

AI Quiz Answers

Past Exam Questions from University Test Bank

Smart Practice Assistant

Adaptive Practice

Making Your Study Simpler