AWS Lambda with DynamoDB Streams not triggering correctly on item updates
I've spent hours debugging this and I've searched everywhere and can't find a clear answer. I am currently working on an AWS Lambda function that is supposed to process events from a DynamoDB Stream. However, it seems that the Lambda function is not being triggered as expected when items in the DynamoDB table are updated. I've checked the stream settings, and they are configured correctly to capture both 'NEW_IMAGE' and 'OLD_IMAGE'. Here's the relevant setup for my DynamoDB table and Lambda function: ```javascript const AWS = require('aws-sdk'); const dynamoDB = new AWS.DynamoDB(); const params = { AttributeDefinitions: [ { AttributeName: 'ID', AttributeType: 'S' } ], KeySchema: [ { AttributeName: 'ID', KeyType: 'HASH' } ], ProvisionedThroughput: { ReadCapacityUnits: 5, WriteCapacityUnits: 5 }, StreamSpecification: { StreamEnabled: true, StreamViewType: 'NEW_AND_OLD_IMAGES' }, TableName: 'MyTable' }; dynamoDB.createTable(params, function(err, data) { if (err) console.log(err); else console.log('Table created:', data); }); ``` The Lambda function is set with the following handler: ```javascript exports.handler = async (event) => { console.log('Received event:', JSON.stringify(event, null, 2)); // Process the event for (const record of event.Records) { console.log('DynamoDB Record: ', JSON.stringify(record, null, 2)); } }; ``` In my testing, when I update an item in the DynamoDB table, I see the update reflected in the UI, but the Lambda function does not seem to trigger. I have confirmed that the IAM roles have the necessary permissions to access DynamoDB and to execute the Lambda function. Additionally, there are no error messages in the CloudWatch logs related to the Lambda execution. I have tried the following troubleshooting steps: 1. Verified that the DynamoDB Stream is enabled and that there are records in the stream after updates. 2. Checked the Lambda function's trigger settings and confirmed that it is correctly linked to the DynamoDB Stream. 3. Increased the read capacity of the DynamoDB table to see if that was causing throttling issues. Despite this, the function still does not execute. Is there something I might be missing in my configuration? Any insights on why the Lambda might not be triggering would be appreciated. Is there a better approach?