Redis Cluster
ELI5 — The Vibe Check
One Redis server is fast. But what if you need MORE fast? Redis Cluster takes your data and spreads it across multiple Redis nodes using hash slots, like dividing a library's books across multiple buildings. Each node handles a slice of the data, and they gossip with each other to stay coordinated.
Real Talk
A distributed implementation of Redis that automatically shards data across multiple nodes using a hash slot mechanism (16,384 slots). It provides automatic failover via replica promotion, linear scalability for both reads and writes, and no single point of failure.
When You'll Hear This
"We moved to Redis Cluster when our single instance hit 64GB — now we shard across 6 nodes." / "Redis Cluster's hash slots mean we can add nodes without resharding everything."
Related Terms
Dragonfly
Dragonfly looked at Redis and said 'I can be 25x faster using modern multi-threaded architecture instead of Redis's single-threaded approach.' It's a drop-
ElastiCache
It's like AWS said 'we know you love Redis and Memcached, but hate managing servers, so here — we'll babysit them for you.' ElastiCache is managed caching
Redis Pub/Sub
Redis Pub/Sub is like a PA system in a building. You shout a message on a channel, and everyone listening to that channel hears it instantly. But if nobody
Redis Streams
Redis looked at Kafka and said 'I can do that too, but simpler and from memory!' Redis Streams is an append-only log data structure built right into Redis.