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Foundations

Concepts

Core building blocks of distributed systems — read these before or alongside the case studies.

Availability, reliability, scalability, CAP theorem, consistency models, fault tolerance, PACELC, concurrency, and NFRs.

CAP TheoremPACELCConsistency ModelsFault Tolerance

Storage & Databases

ACID, transaction isolation, indexing, sharding, replication, database types — Redis, Cassandra, DynamoDB, MongoDB, Elasticsearch.

ACIDShardingReplicationIndexing

Write strategies, eviction policies, cache invalidation, distributed caching, Redis internals, and common cache failure patterns.

Eviction PoliciesCache InvalidationDistributed CachingRedis

Messaging & Event Driven

Kafka internals, SQS, RabbitMQ, event sourcing, CQRS, outbox pattern, stream processing, batch processing, and schema evolution.

KafkaSQSEvent SourcingCQRS