AWS Lambda Timeout Issues with S3 Event Triggers and DynamoDB Updates
I'm maintaining legacy code that I'm working on a project and hit a roadblock..... I tried several approaches but none seem to work... I'm experiencing timeout issues with my AWS Lambda function that is triggered by S3 events. The function is supposed to process files uploaded to an S3 bucket and then update a DynamoDB table based on the content of those files. I initially set the timeout configuration to 3 seconds, but I'm consistently hitting the timeout limit and receiving the following error: ``` Task timed out after 3.00 seconds ``` I increased the timeout to 10 seconds, and while it reduces the frequency of timeouts, I'm still encountering them, especially when dealing with larger files. My Lambda function is configured with the following code snippet: ```python import json import boto3 s3_client = boto3.client('s3') dynamodb_client = boto3.client('dynamodb') def lambda_handler(event, context): for record in event['Records']: bucket = record['s3']['bucket']['name'] key = record['s3']['object']['key'] # Processing the file file_content = s3_client.get_object(Bucket=bucket, Key=key) # Simulating some processing if file_content['ContentLength'] > 1024 * 1024: # Larger than 1MB print('Processing larger file') # Simulate a long-running task time.sleep(5) # Update DynamoDB dynamodb_client.put_item( TableName='MyDynamoDBTable', Item={ 'Key': {'S': key}, 'Processed': {'BOOL': True} } ) return {'statusCode': 200, 'body': json.dumps('Success')} ``` I’ve tried using `asyncio` to manage concurrent processing, but it added complexity without yielding better results. Moreover, I'm aware that Lambda functions have a maximum execution duration of 15 minutes, but I really want to keep it under 10 seconds for performance reasons. I also reviewed the AWS documentation and adjusted the S3 event configuration to ensure that it only triggers when the object is fully uploaded. Still, some files seem to take longer to process, and I suspect there might be a better way to handle this. Any suggestions on optimizing this Lambda function or alternative approaches to prevent timeouts would be greatly appreciated. This is part of a larger application I'm building. Any help would be greatly appreciated! I'm working on a CLI tool that needs to handle this. Any ideas what could be causing this? Has anyone else encountered this? I'd really appreciate any guidance on this.