generated from coulomb/repo-seed
45 lines
1.3 KiB
Markdown
45 lines
1.3 KiB
Markdown
# Pattern: Cell-based Architecture
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Status: seed
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Readiness target: RL3 production
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Primary owners: Railiance platform, product repos
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Genesis family: Tenant isolation
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## Problem
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Large multi-tenant systems need blast-radius control when a single
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shared runtime or data plane would make incidents too broad.
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## Context
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Use this pattern when tenants can be grouped into cells, shards, or
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regional service instances with independent capacity, deployment, and
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failure boundaries.
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## Forces
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- Cells reduce blast radius and scaling contention.
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- Routing and tenant placement become platform responsibilities.
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- Identity, policy, and audit must work across cells.
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- Cross-cell operations need strict control and observability.
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## Solution
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Assign tenants to isolated cells that contain runtime, data, or service
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subsystems. Keep global control-plane operations minimal and require
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tenant-to-cell mapping in deployment, routing, policy, and audit.
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## Verification
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- Tenant-to-cell placement is explicit and auditable.
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- Failure in one cell does not grant access to another cell.
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- Deployments can be rolled out cell by cell.
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- Cross-cell administrative actions are explicitly authorized.
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## Related Patterns
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- Tenant Isolation.
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- Tenant Context Propagation.
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- Central Audit Ledger.
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- Kill Switch / Tenant Freeze.
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