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Open Dynamo-Style KV Store →Open URL Shortener →

Dynamo-Style KV Store vs URL Shortener

Dynamo-Style KV Store

Dynamo-Style KV Store

Leaderless replication, vector clocks, sloppy quorums, hinted handoff: the architecture behind DynamoDB and Cassandra.

Components (6)

Client
Coordinator Node
Storage Node A
Storage Node B
Storage Node C
Anti-Entropy (Merkle)

Headline numbers

Raw storage~300 TB
Per-node QPS~10K–20K req/sec
Replication write amplification3x

URL Shortener

URL Shortener

Hashing, key generation, read-heavy caching.

Components (6)

Client
API Gateway
Write Service
Read Service
Redis
Postgres

Headline numbers

Write QPS (avg)~1,200/sec
Read QPS (avg)~120,000/sec
Storage per year~5 TB

Key differences

Only in Dynamo-Style KV Store

None.

In both

Client
Service
Database

Only in URL Shortener

API Gateway
Redis

Flow shape

Dynamo-Style KV Store flows

Write with quorum (W=2, N=3)3 steps
⚠ Sloppy quorum + hinted handoff4 steps
Concurrent writes create siblings4 steps

URL Shortener flows

Shorten a URL3 steps
Resolve short URL (cache hit)3 steps
Resolve short URL (cache miss)4 steps
⚠ Redis is down4 steps