Rebuilding Read Models: Dead-Letter Queues and Accepting Distributed System Realities

On Rebuilding Read Models, Dead-Letter Queues and Why Letting Go is Sometimes the Answer

TLDR: When rebuilding event-driven read models, a race condition exists where events can be skipped during the transition from "rebuilding" to "active" status. After exploring multiple failed solutions, the author concludes that recording skips as system messages (a Dead Letter Queue pattern) and processing them later is more reliable than trying to prevent the failure entirely.

On rebuilding read models, Dead-Letter Queues and Why Letting Go is Sometimes the Answer

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