Long running jobs shouldn't be first-come first-served

Long-running background jobs can create unfair queues when a single customer, user, scheduled batch, or low-priority workload consumes limited resources and delays other work. Inngest addresses this with concurrency keys, which create separate per-customer, per-user, or per-tenant queues and limits so noisy workloads do not monopolize shared capacity, alongside optional global limits for downstream systems. Priority controls ordering within a queue by treating runs as if they arrived earlier or later based on event data such as subscription plan, interactive versus scheduled source, or backfill status; its bounded time adjustment prevents priority work from indefinitely starving other jobs. The article distinguishes concurrency from throttling, which limits run starts over a time period for rate-limited services, and explains that concurrency keys and priority can be combined to ensure each customer receives a fair resource share while urgent work moves ahead of less time-sensitive work within that customer’s queue.

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