How to use pagination in Amazon DynamoDB using the AWS SDK for Java

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According to this documentation from AWS (https://docs.aws.amazon.com/amazondynamodb/latest/developerguide/Query.Pagination.html), it is possible to make paginated queries on Amazon DynamoDB, but It doesn't provide any example about how to do it. It only says to use the iterator method, that I found on PaginatedQueryList after using DynamoDBMapper.query().

Could anyone explain how does it work, how to use it correctly and if it really worth using it when you don't want to retrieve all results at once from dynamoDB, like the scan opeation does?

amazon-dynamodb amazon-web-services java
1 Answers

To learn about the Amazon DynamoDB Java API, refer to the AWS Java Developer Guide. To work with paginated results (when the response object is too large to return in a single response), it best practice to use AWS SDK for Java V2.

In the AWS SDK for Java 1.0, the response contained a token you had to use to retrieve the next page of results. New in the AWS SDK for Java 2.x are autopagination methods that make multiple service calls to get the next page of results for you automatically.

For more information, see this doc topic in the Java V2 DEV Guide:

Retrieving paginated results using the AWS SDK for Java 2.x

To see code examples that use DynamoDB Java V2 and pagnation, see:

https://github.com/awsdocs/aws-doc-sdk-examples/blob/main/javav2/example_code/dynamodbasync/src/main/java/com/example/dynamodbasync/AsyncPagination.java

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