ReRes

ReRes is a framework and standard for managing resource reservations and reuse in distributed computing environments. It provides a declarative model for specifying how compute, storage, and network resources should be allocated over time, with a focus on predictability, efficiency, and multi-tenant isolation.

In the ReRes model, operators define reservations with attributes such as resource type, quantity, time window, priority, and lease terms. The system enforces the reservations, automatically negotiating start and end times, and can reallocate unused capacity to other requests. When a higher-priority reservation arrives, the framework can preempt lower-priority ones subject to policy.

The architecture typically includes a reservation engine that evaluates requests against the resource catalog, a policy module that encodes fairness and SLA rules, a resource catalog that tracks available and allocated resources, an accounting ledger for usage and billing, and adapters to cloud APIs or cluster schedulers.

Applications include cloud service providers seeking efficient utilization, high-performance computing centers that run batch or interactive workloads, and enterprise data centers with multi-tenant environments. ReRes aims to reduce fragmentation, shorten lead times for reservations, and improve SLA adherence.

Relation to other concepts: ReRes intersects with capacity planning, resource scheduling, and policy-driven management. It differs from runtime schedulers by emphasizing time-based reservations and lease-based control rather than only immediate allocation.

Related topics include resource scheduling, capacity planning, and SLA management.