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Technical Writing

Notes on distributed systems, AI infrastructure, databases, and observability. Written for engineers who want depth, not surface-level takes.

KAFKA INTERNALS · COMMIT LOG ARCHITECTUREPARTITION 0 · APPEND-ONLY COMMIT LOGSEGMENTS0off 0+SEGMENTS1off 100+SEGMENTS2off 200+SEGMENTS3off 300+SEGMENTS4off 400+→PRODUCERwriteCONSUMERreadIN-SYNC REPLICAS (ISR)LEADERFOLLOWER AFOLLOWER Baryan.devdistributed-systems · databases
distributed-systemsdatabases

Kafka Internals: What Every Engineer Should Actually Know

A ground-up explanation of how Kafka actually works — log segments, consumer groups, ISR, offset management, exactly-once semantics, and the tradeoffs hiding beneath every configuration knob.

May 22, 2026·6 min read