Asynchronous DynamoDB Queries with Java Using GSIs and the AWS SDK v2 Enhanced Async Client
When building modern Java applications that interact with AWS DynamoDB , you often need to query data by attributes other than the primary key . This is where Global Secondary Indexes (GSIs) come into play. In this post, we’ll break down: Why GSIs are important How to use the Enhanced Async DynamoDB Client in Java How to query a GSI asynchronously using Reactive Streams How to process results efficiently using CompletableFuture 1. Understanding Global Secondary Indexes (GSIs) A Global Secondary Index (GSI) allows you to query DynamoDB tables using an alternative partition key and optional sort key. Unlike the primary key of the table: A GSI can have different partition and sort keys. It provides fast queries for attributes you don’t want to scan. GSIs are eventually consistent by default, but you can request strong consistency if needed. Why use a GSI here? In our scenario, we have a table of form templates with this schema...