DSE Advanced Replication in DSE 5.1

The DataStax Enterprise (DSE) Advanced Replication feature underwent significant changes between DSE 5.0 and DSE 5.1, improving its design and performance characteristics. Built on Apache Cassandra's multi-datacenter support, it enables selective or "hub and spoke" replication scenarios. The latest version is designed to handle sporadic connectivity often found in environments like retail, oil-and-gas remote sites, and cruise ships. Key improvements include the use of Cassandra Change Data Capture (CDC) feature instead of triggers for capturing mutations, offloading the queue outside DSE using local files, and support for multiple destinations with prioritization and flexible replication options. The new implementation also ensures data integrity, redundancy, and efficient transmission of mutations through deduplication techniques based on an understanding of token ranges, gossip, and mutation structures.