Subscription filters in services like Amazon SNS allow messages with specific attribute values to be delivered only to the subscribers that are interested in those attributes, reducing the volume of unnecessary messages processed by subscribers.
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Subscription filter policies enable you to specify filters that determine which messages a subscriber receives. These filters are matched against message attributes, allowing granular control over message delivery. If a message's attributes match the filter policy of the subscription, the message will be sent to that subscriber; otherwise, it is not sent to that particular subscriber. This mechanism helps to minimize the processing of irrelevant messages, thereby optimizing the messaging throughput and reducing the noise in the system.
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