Alibaba Cloud Certified Associate (ACA) 2025 – 400 Free Practice Questions to Pass the Exam

A 403 error in Log Service can occur when the write throughput of a single partition is exceeded. Each partition in a log store can handle only a limited amount of write throughput, typically measured in MB/s. If the incoming write traffic exceeds this threshold, the system will restrict further write requests, resulting in a 403 error, which indicates that the request is forbidden due to exceeded limits.

This situation is often encountered in high write scenarios, where multiple requests are being processed simultaneously, leading to excessive load on a single partition. As the system enforces its throughput limits to maintain performance and stability, hitting these limits triggers the 403 error, signifying that the request cannot be processed at that moment.

In contrast, other potential causes listed in the options would lead to different types of errors. For example, a malformed write request would typically result in a 400 error, indicating a client-side issue, while a disabled logstore would result in a 404 error, indicating that the resource cannot be found. A changed API endpoint could lead to a 404 or other related errors about unreachable services, rather than a 403. Therefore, understanding the specific context of write throughput provides clarity on why exceeding a single partition's capabilities directly correlates with receiving a