Do s3:ObjectCreated:Put event notidfications always contain a single record?

Question

Is it possible for s3:ObjectCreated:Put event notifications to contain more than one record/event inside Records, or will Records always contain one event for object created events and is simply a list to accommodate other notification types? I have never seen more than one event inside Records and can not find any clear info in the docs, I've also noticed some official getting started examples loop through Records and some simply do Records[0], e.g. https://docs.aws.amazon.com/lambda/latest/dg/with-s3-example.html

Thanks

Answer

S3 event notifications will contain one record per notification.

The code you are seeing that references looping through multiple event records is likely sample code for looping through a retrieval of multiple SQS queue items retrieved. You can retrieve multiple records at a time from SQS and then loop through them.

References:

* [Event notification types and destinations - Amazon S3 User Guide](https://docs.aws.amazon.com/AmazonS3/latest/userguide/EventNotifications.html)
* [ReceiveMessage - Amazon SQS API Reference](https://docs.aws.amazon.com/AWSSimpleQueueService/latest/APIReference/API_ReceiveMessage.html)

Do s3:ObjectCreated:Put event notidfications always contain a single record?

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