Horizontal Scaling Via Sharding And Replication With Load Balancing

via “distributed search across shards with automatic replica failover”

Qdrant - High-performance, massive-scale Vector Database and Vector Search Engine for the next generation of AI. Also available in the cloud https://cloud.qdrant.io/

Unique: Implements Raft-based consensus for shard replica consistency with automatic peer failure detection and promotion of secondary replicas, integrated into the query routing layer so failover is transparent to clients without requiring manual intervention or connection retry logic

vs others: More reliable than eventual-consistency approaches because Raft ensures strong consistency for writes, and automatic failover is faster than manual intervention or external orchestration tools like Kubernetes