During the upgrade period, except for the following scenarios, the release process will be error-free, imperceptible, and request handling will not be interrupted:

1. When the client is deployed on ECS instances within the Classic Network, there might be brief connection interruptions or connection refusals lasting for a few seconds.

2. When using domain name mappings to fixed IP addresses or custom DNS resolutions (e.g., local DNS resolution), there might be brief connection interruptions or connection refusals lasting for a few seconds.

3. During the release period, if there is a message backlog in the queue, requests for deleting messages or modifying message visibility time may result in client errors.

4. In rare and unforeseen circumstances, the service may experience brief, unexpected fluctuations. Each incident will last no longer than 1 minute.

For the above scenarios, please ensure that your client implements reconnection and retry mechanisms.

We apologize for any inconvenience this may cause. If you have any issues, please feel free to contact us via a support ticket.