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Distributed Systems

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Design systems across multiple machines without shared clock or synchronous guarantees. CAP theorem, Raft/Paxos consensus, replicas, partitions, eventual consistency. Career path: Senior Backend Engineer (CAP + sharding, $140-180k) → Staff Engineer (consensus + event sourcing, $180-280k) → Principal (9s availability + chaos engineering, $280-500k+) over 12-18 months. Essential for FAANG Staff+ roles, cloud infrastructure, distributed databases (Cassandra, Spanner, DynamoDB), message brokers (Kafka), coordination services (etcd, Consul, ZooKeeper).

Vad Àr Distributed Systems

Distributed Systems is the art of designing fault-tolerant services across multiple independent machines with no shared clock, shared state, or synchronous guarantees. CAP theorem (Consistency vs Availability during Partitions) defines the core tradeoff: databases choose CP (wait for consensus, consistency guaranteed) or AP (accept writes, sync later, eventual consistency). Consensus algorithms (Raft, Paxos) solve the leader election and state synchronization problems. Replication strategies (leader-follower, multi-master) enable scale. Partitioning/sharding splits data across machines. In 2026, every system handling >100 QPS is distributed. Engineers who understand these patterns design the infrastructure powering Google, Amazon, and Netflix. This skill separates senior engineers (understand CAP, replication) from staff/principal engineers (design consensus, fault recovery, 99.99%+ availability at scale). The salary impact is massive: Staff engineers mastering distributed systems earn $180–300k+; principal engineers designing infrastructure that scales to millions of users earn $250–500k+. Companies with >$100M ARR have infrastructure teams entirely focused on distributed systems challenges. The structural demand is permanent: scale requires distribution. As companies grow, every engineer eventually hits the hard problems of distributed systems (inconsistent replicas, split-brain elections, eventual consistency bugs).

🔧 VERKTYG & EKOSYSTEM
KafkaRabbitMQNATSetcdZooKeeperConsulCassandraDynamoDBCockroachDBFoundationDBGoogle Cloud SpannergRPCTemporalAkkaErlang/OTP

📋 Innan du börjar

Backend DevelopmentKubernetes Docker

💰 Lön per region

OmrÄdeNybörjareMidErfaren
USA$0$160k$240k
UKÂŁ0ÂŁ95kÂŁ145k
EU€0€105k€160k
CANADAC$0C$170kC$260k

❓ Vanliga frĂ„gor

CAP theorem says pick 2 of 3, is that real?
Oversimplified. CAP applies only during network partitions (rare). What you trade is consistency latency vs availability latency. Most systems are CP by design (wait for consensus before responding) or AP (accept writes, sync later). The nuance: partition doesn't happen often; during normal ops, you want CA. RDBMs = CP, DynamoDB/Cassandra = AP.
When do I actually need distributed consensus (Raft, Paxos)?
Only when you need a single source of truth across multiple machines that tolerate failures. Examples: leader election, config distribution (etcd, Consul), distributed locks, blockchain. Most application-level code doesn't need this, use the database's built-in consensus instead (MySQL InnoDB Group Replication, PostgreSQL replication, Cassandra's quorum reads).
Raft vs Paxos, which should I learn?
Raft (designed for teaching, used in etcd/Consul). Paxos (harder, used in Google Chubby/Bigtable). Learn Raft for interviews. Paxos for deep dives. Both guarantee safety (once committed, never lost) and liveness (progress under failures). Key insight: both are just consensus; implementation differences matter more than algorithm choice.
Distributed transactions (2PC) always fail, why use them?
2PC (two-phase commit) blocks during failures and doesn't scale. Better: Saga pattern (choreography via events or orchestration service). Trade: multiple DBs see eventual consistency instead of immediate atomicity. Acceptable for most systems; required only when you absolutely need immediate ACID across DBs (rare).
Eventual consistency means stale data forever, is it broken?
No. Eventual consistency = reads may see old data, but writes always propagate. Bounded staleness (usually <100ms). Good UX masks it: show what you just wrote optimistically, don't query immediately after. Eventual consistency enables scale (read replicas, global CDNs). ACID = slower, scales to 1 region; eventual consistency = scales globally.
How do I monitor distributed systems for hidden failure modes?
Build observability: distributed tracing (Jaeger/Zipkin), structured logging (ELK, Datadog), metrics (Prometheus). Test failure modes with chaos engineering (Gremlin, chaos monkey). Manual testing: simulate network latency, packet loss, process crashes. Most issues found in production, run blameless postmortems, treat as learning.
What's the hardest part of distributed systems in practice?
Debugging. A request spans 10 services, each with replicas, retries, timeouts, and race conditions. Tracing + logging are non-negotiable. Second-hardest: keeping mental models accurate (what state can we be in?). Third: operational overhead (monitoring, alerting, runbooks). Start with boring centralized systems; move to distributed only when you've hit concrete limits.

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