Fairness and Backpressure in Real-Time Moderation Queues

Short summary

The article describes patterns for managing real-time moderation queues during live events where bursty uploads can overwhelm processing stages. It recommends separate queues per stage with weighted scheduling, per-session concurrency caps, admission control with durable waiting states, and backpressure propagation to prevent cascading failures. Idempotent actions, stable media IDs, and careful human queue UX ensure fair, predictable moderation even under heavy load.

• •Use distinct queues per processing stage with weighted worker slots so small items flow while expensive jobs get guaranteed capacity
• •Apply per-session concurrency caps and admission control that distinguishes 'accepted but queued' from 'processing'
• •Propagate backpressure upstream, use visibility timeouts with idempotent retries, and keep moderator queue positions stable

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