AWS Big Data Specialty

Ingestion Tools Delivery:

Guranteed oredering  delivery by all AWS services except Firehose & SQS(Standard)

Exactly Once  delivery by only DynamoDB Streams and Amazon SQL(FIFO)  and all others are at least once.

 AWS Lambda : Limited capabilities of buffering 

AWS EMR : Single Availability Zone

AWS Redshift does not support resource based policies.  DynamoDB provides fine-grained access to your tables and data