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User saves their profile. Page reloads. Shows old data. They save again — same thing. The write went to the primary. The read came from the replica. The replica is 2 seconds behind. Read-after-write consistency is the hardest problem with read replicas.
Master read replica deployment: detect replication lag, handle read-after-write consistency, implement query routing middleware, monitor replica health, and recognize when replicas don''t help.
Building real-time AI streaming: SSE vs WebSockets, streaming through load balancers, Redis pub/sub, backpressure, and Next.js App Router integration.
Multiple users editing simultaneously creates conflicts. CRDTs solve it with conflict-free merging. Learn Yjs, persistence, and scaling collaboration backends.
Understand Redis Cluster architecture, consistent hashing, CROSSSLOT errors, hot slot detection, replication, and monitoring for production deployments.