👀 Views: 0 💬 Answers: 1 📅 Created: 2025-06-12

aws dynamodb step-functions lambda streams JavaScript

This might be a silly question, but I'm optimizing some code but I'm having a hard time understanding I'm having a hard time understanding I recently switched to Hey everyone, I'm running into an issue that's driving me crazy..... I'm running an AWS Step Function that triggers after a DynamoDB item is updated. However, I'm facing an issue where the Step Function is sometimes retrieving an outdated version of the item. I have set up DynamoDB Streams to capture changes, but it seems like the data being passed to the Step Function is not the latest version. For instance, when an item in my `Users` table is updated, the Step Function should fetch the updated details, but instead, I often see the previous values. Here's a snippet of how I'm invoking the Step Function: ```json { "Type": "Task", "Resource": "arn:aws:states:us-east-1:123456789012:stateMachine:MyStateMachine", "Parameters": { "dynamodbRecord.$": "$.Records[0].dynamodb" }, "ResultPath": "$.StepFunctionResult", "Next": "NextState" } ``` I am using AWS SDK version 2.x for JavaScript in a Node.js Lambda function to process the stream event: ```javascript const AWS = require('aws-sdk'); const stepfunctions = new AWS.StepFunctions(); exports.handler = async (event) => { for (const record of event.Records) { const params = { stateMachineArn: 'arn:aws:states:us-east-1:123456789012:stateMachine:MyStateMachine', input: JSON.stringify(record) }; await stepfunctions.startExecution(params).promise(); } }; ``` I've verified that the DynamoDB Stream is enabled and that the Lambda function is correctly triggered on updates. The issue seems to occur sporadically, leading me to suspect that the event delivery and processing might not be in sync. I've also considered the eventual consistency model of DynamoDB, but I thought that using Streams would mitigate this issue. Is there a configuration or best practice I might be missing to ensure that the Step Function always retrieves the latest version of the item when triggered by the stream? I'm working in a Ubuntu 20.04 environment. Thanks in advance! For reference, this is a production service. Am I missing something obvious? Any feedback is welcome! What's the correct way to implement this? This issue appeared after updating to Javascript 3.10. What am I doing wrong? I'm developing on Windows 10 with Javascript. Am I missing something obvious?