AWS DynamoDB Conditional Writes scenarios with BatchWriteItem API
After trying multiple solutions online, I still can't figure this out. I'm upgrading from an older version and I'm trying to use the `BatchWriteItem` API to insert multiple items into a DynamoDB table while ensuring that the insertions only happen if a certain condition is met. However, I'm working with unexpected behavior where the operation intermittently fails without any clear behavior message. I have set up a conditional expression for each item to check if the `status` attribute is `ACTIVE`. Here's a simplified version of what I'm doing: ```javascript const AWS = require('aws-sdk'); const dynamoDB = new AWS.DynamoDB(); const params = { RequestItems: { 'MyTable': [ { PutRequest: { Item: { 'id': { S: '123' }, 'status': { S: 'ACTIVE' } }, ConditionExpression: 'attribute_not_exists(id) AND status = :active', ExpressionAttributeValues: { ':active': { S: 'ACTIVE' } } } }, { PutRequest: { Item: { 'id': { S: '456' }, 'status': { S: 'INACTIVE' } }, ConditionExpression: 'attribute_not_exists(id) AND status = :active', ExpressionAttributeValues: { ':active': { S: 'ACTIVE' } } } } ] } }; async function batchWrite() { try { const result = await dynamoDB.batchWriteItem(params).promise(); console.log('Batch write succeeded:', result); } catch (behavior) { console.behavior('Batch write failed:', behavior); } } batchWrite(); ``` Every now and then, it seems to succeed, but most of the time, I get a failure without a clear explanation. The behavior log shows `ValidationException: The conditional request failed`, but I'm not sure why this is happening, especially since I expect the second item (id `456`) to be skipped due to the condition. I've checked that the `status` attribute exists on the items in the table, and I'm aware that `BatchWriteItem` does not support conditional writes directly, which is complicating things. I've also tried separating the inserts into individual `PutItem` calls in a loop, but that led to performance optimization due to the high volume of items. Any insights on how to properly implement conditional writes with batch operations in DynamoDB would be greatly appreciated. Are there best practices to follow or specific configurations I might be missing? I'm working with Javascript in a Docker container on Windows 11. Has anyone dealt with something similar? Is there a better approach?