Cache stampede and the thundering herd problem
Why one expired key can overload your database, and how locks, request coalescing, probabilistic early refresh, TTL jitter and serving stale data prevent it.
Ideas & updates
The Upclass Blog
Security, piracy and engineering deep dives, plus practical ideas for growing your institute. From the team building Upclass.
More articles Page 8 of 11
iOS screen recording detection: what it can't stop
iPhone apps can detect screen recording but not block it. What iOS tells apps, what it misses, and where iOS course apps leave gaps.
How database indexing works, with Postgres examples
B-trees in plain English, reading EXPLAIN ANALYZE, composite, partial and covering indexes, what indexes cost, and adding them to a live Postgres table safely.
Prevent screen capture on Windows and Mac: the limits
Windows can keep an app out of standard captures and macOS can't. Neither stops cameras, capture devices or virtual machines. Where desktop lectures leak.
Read replicas and database replication explained
How PostgreSQL streaming replication works, synchronous vs asynchronous commits, routing reads in Django, handling replication lag, and replicas for failover.
How digital signatures work, step by step
Hash, sign with a private key, verify with a public key: what digital signatures prove, where you meet them every day, and how India's DSCs and eSign work.
Can Netflix detect screen recording? Why it goes black
Netflix mostly prevents screen recording rather than detecting it. Why protected video goes black, what still gets through, and what it means for courses.
Video transcoding pipelines: from upload to HLS
How to turn an uploaded lecture into encrypted HLS: probing, encoding a ladder with FFmpeg, queue-driven workers, CPU vs GPU vs spot capacity, retries and what one lecture really costs.
What is HDCP? Screen mirroring, HDMI capture and your videos
What HDCP protects, why students see HDCP errors on projectors, why it doesn't stop every capture, and where mirroring rules clash with classrooms.
Adaptive bitrate streaming and bitrate ladders explained
How players choose between renditions, what hls.js and dash.js do by default, and how to design a bitrate ladder that keeps lectures playing on patchy mobile networks.
Cipher suites explained: TLS 1.3 and forward secrecy
Decode a cipher suite name part by part, see TLS 1.3's five suites, learn which weak suites to remove after RFC 10015, and test what your server really accepts.
TLS 1.2 vs TLS 1.3: what changed and why it matters
TLS 1.3 connects faster and drops the options behind a decade of attacks. What changed, what 0-RTT risks, what it means on mobile, and whether to keep TLS 1.2.
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