liuml07 commented on issue #1752: HADOOP-16732. S3Guard to support encrypted DynamoDB table URL: https://github.com/apache/hadoop/pull/1752#issuecomment-577364206 > do you know what the KMS IO load is when you use a CMK? From https://docs.aws.amazon.com/kms/latest/developerguide/services-dynamodb.html, it does not seem a concern that the KMS would be overloaded simply. The CMK is only used to encrypt the table key, which is saved and maintained by DynamoDB out of KMS. The table key is used to encrypt and decrypt data. It also caches the table key like 5 mins or so.
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