qdrant-tenant-scaling

# What to Do When Scaling Multi-Tenant Qdrant Do not create one collection per tenant. Does not scale past a few hundred and wastes resources. One company hit the 1000 collection limit after a year of collection-per-repo and had to migrate to payload partitioning. Use a shared collection with a tenant key. - Understand multitenancy patterns [Multitenancy](https://search.qdrant.tech/md/documentation/manage-data/multitenancy/) Here is a short summary of the patterns: ## Number of Tenants is around 10k Use the default multitenancy strategy via payload filtering. Read about [Partition by payload](https://search.qdrant.tech/md/documentation/manage-data/multitenancy/?s=partition-by-payload) and [Calibrate performance](https://search.qdrant.tech/md/documentation/manage-data/multitenancy/?s=calibrate-performance) for best practices on indexing and query performance. ## Number of Tenants is around 100k and more At this scale, the cluster may consist of several peers. To localize tenant data and improve performance, use [custom sharding](https://search.qdrant.tech/md/documentation/operations/distributed_deployment/?s=user-defined-sharding) to assign tenants to specific shards based on tenant ID hash. This will localize tenant requests to specific nodes instead of broadcasting them to all nodes, improving performance and reducing load on each node. ## If tenants are unevenly sized If some tenants are much larger than others, use [tiered multitenancy](https://search.qdrant.tech/md/documentation/manage-data/multitenancy/?s=tiered-multitenancy) to promote large tenants to dedicated shards while keeping small tenants on shared shards. This optimizes resource allocation and performance for tenants of varying sizes. ## Need Strict Tenant Isolation Use when: legal/compliance requirements demand per-tenant encryption or strict isolation beyond what payload filtering provides. - Multiple collections may be necessary for per-tenant encryption keys - Limit collection count and use payload filtering within each collection - This is the exception, not the default. Only use when compliance requires it. ## What NOT to Do - Do not create one collection per tenant without compliance justification (does not scale past hundreds) - Do not skip `is_tenant=true` on the tenant index (kills sequential read performance) - Do not build global HNSW for multi-tenant collections (wasteful, use `payload_m` instead)