Expedia Group's migration from Cassandra to ScyllaDB emphasizes the motivation to utilize ScyllaDB's CDC capabilities for improved data consistency, reduced complexity, and operational efficiency. The migration process had to assure zero downtime and the preservation of critical sensitive data, avoiding any disruptions to user authentication and sessions, especially with large data volumes and strict latency requirements.
The team faced significant challenges during the migration, particularly concerning the need for maintaining continuous application access while transferring 1 TB of non-compressed data. They had to ensure that both the migration tool and the architecture could accommodate the critical goals of zero downtime and the preservation of data integrity, as any data loss would severely impact the platforms.
Choosing Scylla Migrator over SSTable Loader was pivotal to the migration's success. Scylla Migrator's checkpointing ability, parallel migration support for large datasets, and built-in validation provided reliable backup options, minimizing the risk of failure during the crucial migration process. The reliance on such robust tools allowed the team to maintain consistent performance and stability throughout the migration phases.
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