migrate dynamodb to cassandra

Some customers such as Samsung had to figure out on their own how to migrate their Apache Cassandra databases to Amazon DynamoDB (see Moving a Galaxy into the Cloud: Best Practices from Samsung on Migrating to Amazon DynamoDB). If your instance running the AWS SCT is in the same virtual private cloud (VPC) as the cloned data center that is being used as a source, you can use the private IP address. In contrast, DynamoDB simplifies this to two configurable consistency levels for reads — eventual consistency and strong consistency. This datacenter clones all data from the original cluster, and then SCT uses this datacenter to migrate the data to Amazon DynamoDB. Amazon takes care of resiliency by having a multi-AZ setup by default. For example, the AWS SCT uses this information to access DynamoDB tables in an account. Follow these steps in the AWS SCT to register the data extraction agent: After the data extraction is registered in the AWS SCT, you should be able to create tasks to extract data and migrate it to DynamoDB from Cassandra. You can use AWS DMS and the AWS SCT to migrate from any supported sources (such as MongoDB) to any supported targets (such as Amazon DynamoDB). Create a local extraction task that uses the data extraction agent to collect bulk-load data and ongoing changes from the Cassandra data center to Amazon S3. Monitor the progress of the AWS DMS task in the table on the Tasks tab. Enable bootstrapping on the target data center. Alternatively, if private communication is not possible, you can use the public IP address. The below diagram shows the difference between the various consistency levels**, for a Cassandra ring with 3 nodes and a replication factor=3, as against a standard DynamoDB table*. Example: Samsung • Online migration • Full migration is not possible (several 100s of TB sized tables) : Per user migration • Some users are in Cassandra while others are in DynamoDB : Storage path DB • To minimize impact for each user, migrate as soon as possible : Accelerate migration Cassandra cluster DynamoDB App Servers user storage path User A User B

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