DD
Pastebin · Deep Dives
Deep Dives
Eight deep dives — short code generation, database, caching, peak traffic, fault isolation, async S3 upload, expiry cleanup, and final architecture.
Short Code Generation
Requirements, generation approaches, Redis counter, and custom alias support.
Redis CounterCustom AliasCollision
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Database
DB choice, content-addressable storage, ref counting, schema design, write/read/delete flows, and sharding.
CASRef CountingSchemaSharding
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Caching
Why cache, what to cache, cache sizing, and invalidation strategy.
RedisCache SizingInvalidation
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Peak Traffic
Hot key problem for viral pastes — detection, mitigation, and local cache approach.
Hot KeyViral PasteLocal Cache
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Fault Isolation
Service split, DB standby, and circuit breaker to contain failures.
Service SplitDB StandbyCircuit Breaker
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Async S3 Upload
Why async, failure problem, state machine, retry strategy, and read path behaviour.
S3State MachineAsyncRetry
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Expiry Cleanup Job
Cleanup flow, distributed workers, watchdog process, and indexing strategy for expired pastes.
TTLDistributed WorkersWatchdogIndexing
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Updated Architecture
Full system diagram after all deep dives applied — every component justified.
Final DiagramFull Architecture
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