Consistent Hashing Explained
How consistent hashing works, why it beats modulo hashing when servers change, how virtual nodes balance load, and where it’s used in caches and databases.
Topic
Distributed Systems
Consistency, partitioning and the theory behind systems that span many machines.
CAP Theorem and PACELC in Plain English
The CAP theorem and its extension PACELC explained: consistency, availability and partition tolerance, what the trade-offs mean in practice and common myths.
How CDNs Work
How CDNs work: edge locations, request routing, cache keys, Cache-Control headers, invalidation, origin shielding, security features and edge compute.
Distributed Locks and Leases
How distributed locks and leases work, why process pauses break naive locks, fencing tokens, Redis, ZooKeeper, etcd and database locks, and alternatives.
The Saga Pattern for Distributed Transactions
The saga pattern explained: local transactions and compensating actions, choreography vs orchestration, the outbox pattern and isolation pitfalls.