Phase 2: Migrate and validate data

Astra DB Sideloader is a service running in Astra DB that directly imports data from snapshots of your existing Cassandra-based cluster. This tool is exclusively for migrations that move data to Astra DB.

You can use Astra DB Sideloader alone or in the context of ZDM.

For more information, see Use Astra DB Sideloader with ZDM.

You can use Cassandra Data Migrator (CDM) to migrate and validate tables between Cassandra-based clusters. It is best for migrating large amounts of data and for migrations that need support for detailed logging, data verification, table column renaming, and reconciliation.

CDM offers extensive functionality and configuration options to support large and complex migrations as well as post-migration data validation.

You can use CDM by itself, in the context of ZDM, or for data validation after using another migration tool, such as Astra DB Sideloader.

For more information, see Use Cassandra Data Migrator with ZDM.

DSBulk Migrator is an extension of DSBulk Loader. It is best for smaller migrations or migrations that don’t require data validation during the migration process.

In addition to loading and unloading CSV and JSON data, you can use DSBulk Migrator to transfer data between databases. It can read data from a table in your origin database, and then write that data to a table in your target database.

You can use DSBulk Migrator alone or in the context of ZDM.

For more information, see Use DSBulk Migrator with ZDM.

If you want to write your own custom data migration processes, you can use a tool like Apache Spark™.