migration – How to migrate from Aerospike to DynamoDB

I have a client running Aerospike 3 with a maxed-out database (around 20 TB) who needs to migrate to AWS DynamoDB. Does anyone have any comments on the best way to do this, or pitfalls? In particular, is it a good idea to try to use the Database Migration Service, or to write things to S3 and use AWS Glue?