Why it matters

Shared HBase clusters need tenant isolation. Understanding shapes production shared infra.

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The architecture

Namespaces: logical separation (tenant/table).

Quotas: request or space limits per namespace or user.

Multi-tenancy isolationNamespaceslogical groupingQuotasRPC + space limitsRSGroupsphysical RS isolationRSGroups give hardware isolation; quotas prevent noisy neighbor
Isolation layers.
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How it works end to end

RSGroups: assign specific RegionServers to a tenant. Hardware isolation.

Quotas: throttle namespace or user requests. Prevent noisy neighbor.

Access control: Ranger + HBase ACLs per namespace.