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Learning AWS - Second Edition by Amit Shah, Aurobindo Sarkar

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Implementing asynchronous processing 

Implementing asynchronous processing in your application can improve scalability. This is typically done using AWS SQS queues. However, ensure that you implement a dead letter queue for queue requests that fail after several retries (usually between three and five times). You can use the AWS SNS service for notifying components when a message’s request processing has been completed. You can also create asynchronous pipelines for data flows within your application using AWS Kinesis data streams, and AWS SQS queues where you can route your data to different queues to be processed differently.

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