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The Mystery of the Redis Read-Only Error in a Single-Node Setup

Summary by DEV Community
If you manage a realtime application, you know that Redis is often the beating heart of your infrastructure. Recently, our production application—which relies heavily on Redis for both backend caching and realtime collaboration (via Hocuspocus/Yjs)—experienced a bizarre and catastrophic outage. Every few months, out of nowhere, Redis would randomly crash our system. The logs were flooded with a single, confusing error: READONLY You can't write …
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DEV Community broke the news on Thursday, May 14, 2026.
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