Google Cloud Professional Cloud Developer Practice Test 2025 – Complete Exam Prep

Implementing retry logic when encountering HTTP 503 errors, which indicate that the service is temporarily unavailable, is an essential aspect of building resilient applications. The best approach is to use exponential backoff, which is represented by the choice of retrying each failure at increasing time intervals up to a maximum number of tries.

This method involves waiting for progressively longer periods of time between each retry attempt. For instance, after the first failed attempt, the application might wait a short period (e.g., a few seconds), and if that attempt fails too, it will wait for a longer duration (e.g., 4 seconds), and then progressively longer after each subsequent failure (e.g., 8 seconds, 16 seconds, etc.), until it either succeeds or reaches the maximum number of retry attempts.

The rationale behind this approach is that it reduces the load on the server by not overwhelming it with immediate retries. Instead, it allows time for the server to recover from issues. By increasing the intervals, the client is giving the server ample opportunity to become available again, which is particularly useful in situations of transient errors like HTTP 503.

Choosing a fixed time interval, as indicated in another option, might lead to inefficient use of resources and could worsen the