What are tenants and namespaces in Pulsar?

A tenant is the top-level unit of multi-tenancy in Pulsar, typically mapped to an organization or team, used to apply resource quotas and authentication/authorization boundaries.

A namespace is a logical grouping of topics within a tenant - for example separating dev, staging, and prod - and it's the unit at which most operational policies (retention, replication, backlog quotas) are configured for every topic inside it.

Together, tenant/namespace/topic form Pulsar's hierarchical naming structure, e.g. persistent://my-tenant/my-namespace/my-topic, letting large organizations share one cluster safely.

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