Not every fulfilled wish brings joy. Every boy wishes to grow stronger than his father. And then, one day, he does. Only to realize that the day he finally surpasses his father’s strength is also the day he understands that his father has grown weaker.

500K people online in a server. Someone sends “hello”. 500K deliveries? No. About 500. Publish once per gateway, fan out locally in memory. Also covered: Snowflake IDs for ordering Time-bucketed Cassandra partitions Bitmask permissions Do read-

For those of you who are new, I have written a comprehensive article that's basically a deep dive on Redis, from first principles to production. Most people know Redis as “that fast cache.” It is so much more. Here is what the full article covers: Foundations: what Redis is and why in-memory changes everything Data structures: Strings, Lists, Sets, Sorted Sets, Hashes, Bitmaps, HyperLogLog, Streams, Geo Core features: TTL, eviction, transactions, pipelining, Lua, Pub/Sub Persistence: RDB, AOF, and the hybrid mode Scale: replication, Sentinel, and Cluster with its 16,384 hash slots Security and ops: ACLs, TLS, memory tuning, monitoring Real-world patterns: caching, rate limiting, distributed locks, queues, leaderboards Modern Redis: JSON, search, time series, Bloom filters, vector search If you work on backend systems, this is the one resource that takes you from “SET and GET” to designing a production-grade Redis setup.