1. What is message filtering in Amazon SNS?
Answer: Message filtering is a feature in Amazon SNS that allows subscribers to receive only specific messages based on the filtering criteria. It helps to reduce the cost of message delivery and improves the efficiency of message processing.
2. How can I apply a subscription filter policy in Amazon SNS?
Answer: You can apply a subscription filter policy in Amazon SNS using the AWS Management Console, AWS CLI, AWS SDKs, or Amazon SNS API. The filter policy defines the criteria for selecting the messages that should be delivered to the subscriber.
3. What are the constraints for filter policy in Amazon SNS?
Answer: The filter policy in Amazon SNS has some constraints such as string value matching, numeric value matching, key matching, and AND/OR logic. These constraints ensure that the filter policy is applied correctly and only the relevant messages are delivered to the subscriber.
4. How can I configure delivery status attributes for topics subscribed to Amazon SNS endpoints using the AWS SDKs?
Answer: You can configure delivery status attributes for topics subscribed to Amazon SNS endpoints using the AWS SDKs by specifying the attributes in the Subscribe API call. The delivery status attributes provide information about the delivery status of each message that is sent to the subscriber.
5. How can I remove a subscription filter policy in Amazon SNS?
Answer: You can remove a subscription filter policy in Amazon SNS using the AWS Management Console, AWS CLI, Amazon SNS API, or AWS CloudFormation. The removal of subscription filter policy ensures that all messages are delivered to the subscriber without any filtering.