Migrate to Amazon Keyspaces with zero downtime using ZDM Proxy

A detailed guide on migrating from self-managed Apache Cassandra to Amazon Keyspaces with zero downtime using the ZDM (Zero Downtime Migration) Proxy. The proxy intercepts CQL traffic at the network layer, fanning out writes to both the origin cluster and Amazon Keyspaces simultaneously, requiring no application code changes. The solution deploys the proxy on AWS Fargate behind a Network Load Balancer using a single CloudFormation stack. The migration follows six phases: preparation, historical data loading with CQLReplicator, enabling dual writes, validation (dual reads with discrepancy monitoring), cutover (blue-green or canary), and decommission. Security considerations include TLS via socat, credentials in AWS Secrets Manager, least-privilege IAM roles, and VPC endpoints. Cost components during migration include Fargate tasks (~$100/month for 3 tasks), NLB ($20–50/month), and AWS Glue for CQLReplicator.

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