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podcast-hosting

podcast hosting and RSS distribution

Transistor, Buzzsprout

SystemTechniques · 18Primitives · 69 podcast-hosting CDN and edgecloud · medium: CDNs cache content in hundreds of PoPs near users, cutting latency and egress bills; edge compute runs small code there. Bandwidth price spreads 10x between providers.›Deterministic simulation testingdistributed · medium: Run the whole system in one thread under a seeded scheduler with simulated network, disk and clock, so every failure replays from its seed.›Durable job queuedistributed · medium: Persisted tasks that workers lease for a visibility timeout, ack on success and retry with backoff; at-least-once execution that survives worker and queue crashes.›Primary-backup replicationdistributed · medium: One node orders all writes and ships them to standbys; the acknowledgement rule (none, one, all) sets what a crash loses, and an external arbiter decides who takes over.›RNN transducer (RNN-T)machine-learning · medium: Streaming sequence model that sums all monotone alignments in a frame-by-label lattice and conditions each label on earlier ones.›Perceptual audio codingmedia · medium: MDCT transform coding with psychoacoustic masking (Opus, Vorbis, AAC); streaming decodeWebhook deliverynetworking · medium: Reliable server-to-server HTTP callbacks: signed POSTs, 2xx-means-done, retries over days with jitter, endpoint disabling, SSRF guards and idempotent receivers.›HTTP caching semanticsnetworking · low: The rules (RFC 9111) that decide whether a stored response is still fresh, and how a cheap conditional request revalidates it when it is not.›Object storagecloud · low: S3-compatible blob storage at cents per GB-month with 11 nines durability; pick by egress price, request price and latency, not by storage price alone.›Managed databasescloud · low: RDS, Aurora, Cloud SQL, Spanner, DynamoDB, Cosmos DB and the Postgres startups: what each is for, what it costs, and the limits that bite.›Hdr histogramdata-structures · low: Log-linear bucketed histograms with bounded relative error for latency percentilesHyperLogLogdata-structures · low: Counts distinct elements in kilobytes with about 1 % error by tracking the longest run of leading zero bits in hashed values per bucket.›Event deduplication windowdistributed · low: Keep the ids of recently accepted events for a time window and drop repeats; memory stays bounded by rotating time buckets instead of per-entry timers.›Process supervisionhardware-os · low: A parent process starts services, reaps their exits and restarts them under a delay and burst-limit policy, then stops them with SIGTERM before SIGKILL.›Audio loudness normalizationmedia · low: EBU R128 / ITU BS.1770 integrated loudness measurement and gainMedia containersmedia · low: MP4/ISO BMFF, fragmented MP4/CMAF, Matroska and MPEG-TS mux/demuxHTTP range requestsnetworking · low: Ask for byte offsets with Range and get a 206 slice back; the standard way to resume, seek and read big remote files piecewise.›Resumable uploadsnetworking · low: Open an upload session, send the body in offset-addressed chunks, and after any failure ask the server how much it committed and continue from there.›User agent parsingsearch-sort · low: Parse user-agent strings and client hints into browser, OS and deviceMutual TLSsecurity · low: TLS where the client also proves a certificate key, so every connection carries a verified, rotatable machine identity.›Salted visitor hashingsecurity · low: Count unique visitors with hashes of IP+UA under a daily rotating salt, no cookiesSigned URLssecurity · low: A URL carrying its expiry and a MAC or signature over method, path and query, so a verifier holding the key needs no lookup.›XML Streaming Parserstorage · low: Tokenize XML into start, text and end events in constant memory, so a few fields can be extracted from huge, broken or hostile documents.›+ 11 more techniques+ 53 more primitives

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