Which of the following is a possible reason for the Lambda function’s inability to launch?
The S3 event notification does not activate for files that are larger than 1,000 MB.
The resource-based policy for the Lambda function does not have the required permissions to be invoked by Amazon S3.
Lambda functions cannot be invoked directly from an S3 event.
The S3 bucket needs to be made public.
Explanations:
S3 event notifications do not have a size limit of 1,000 MB for triggering Lambda functions. They will activate regardless of file size, provided the notification is configured correctly.
If the resource-based policy for the Lambda function does not allow invocation by S3, the Lambda function will not be triggered when a file is uploaded, regardless of its size. This is a common issue when configuring triggers between services.
Lambda functions can indeed be invoked directly from S3 events. S3 can trigger Lambda functions when specific events occur, such as file uploads, without any restrictions based on the event source.
Making the S3 bucket public is not necessary for triggering Lambda functions. The event notification system works regardless of the bucket’s public access settings, as long as the appropriate permissions and configurations are in place.
I suspect that the answer is:
The resource-based policy for the Lambda function does not have the required permissions to be invoked by Amazon S3.