Final answer:
Amazon Simple Queue Service (SQS) does not guarantee strict message ordering, but it provides a best-effort ordering. To achieve strict ordering, you can use the Message GroupId attribute when sending messages.
Step-by-step explanation:
Amazon Simple Queue Service (SQS) provides a messaging system that allows you to decouple and scale microservices, distributed systems, and serverless applications. However, SQS does not guarantee strict message ordering out of the box. By default, it provides a best-effort ordering where messages are generally delivered in the order they are sent, but in certain cases, their order can be affected.
To achieve strict message ordering, you can use the MessageGroupId attribute when sending messages. Messages with the same group ID are always processed one-by-one, in a strict order. Messages with different group IDs, however, can be processed concurrently and their ordering is not guaranteed.
It's important to note that achieving strict ordering may impact the performance and scalability of your system, as it requires additional coordination and potentially reduces parallel processing.