Sync Invocation
- Ex: API Gateway, Kinesis Data Firehose, S3 Batch
- Wait for response from function
Synchronous from poller
- Ex: DynamoDB Streams, Kinesis, SQS
Async Invocation
- Ex: SNS, AWS IoT, S3
- Queue the events before sending them to the function
- Don’t wait for response from function
- Only asynchronous invocation can trigger on-success/on-failure destinations.