分布式系统基础套件

Reference latency and unit tables, assumptions register, QPS, storage, bandwidth, cache, server and cost formulas, worked example, sensitivity, traceability

UUIDv4 and v7 per RFC 9562, Snowflake 41/10/12 layout, clock skew and backwards clocks, leased worker IDs, index locality, 53-bit JS limit, ticket servers

Failure model, deadlines, retries with jitter and budgets, circuit breakers, bulkheads, backpressure, criticality-based shedding, degradation, fault tests

Consistent hashing, vnodes, quorums (R+W>N), vector clocks vs LWW, hinted handoff, Merkle anti-entropy, gossip, LSM compaction, cache eviction, hot keys

Distributed cache: cache-aside, delete on write, leases against herds, commit-log invalidation across regions, slot maps, hot keys, gutter pool, warm-up

Lock and coordination service: Raft consensus, read index, sessions and keep-alives, leader election, fencing tokens, watches, read scaling, misuse policy

Partitions, log segments, retention, acks and idempotence, consumer groups, offsets, delivery semantics, ordering, ISR replication, backpressure, DLQ, schemas

Stream processing engine: event time, watermarks, windows and triggers, late data, keyed state, barrier checkpoints, exactly-once sinks, backpressure, rescaling

CDC pipeline: log-based capture, watermark chunked snapshot, per-key order, schema evolution, outbox, search, cache and warehouse sinks, replay

Durable workflow engine design: event history and replay, deterministic code, activities, timers, task queues, retries, versioning, visibility, history sharding