#kafka

2 posts filed under this tag.

May 5, 2026Engineering

Event-Log-as-Source-of-Truth Turns Schema Evolution Into a Forever Problem

When the log is the source of truth, every schema change is permanent. A Kotlin/Avro walkthrough of the rename that passed the Schema Registry check and silently corrupted every old event, plus the Protobuf and Avro invariants I now keep pinned above my desk.

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Apr 17, 2026Engineering

The Transactional Outbox Is Not a Queue

The transactional outbox is a ledger, not a queue. Treating it like one is what breaks Postgres under load. This post walks through the specific failure modes — autovacuum stalls, xmin horizon drift, replication slot lag, poison pills — and the operational rules that actually keep it working in production.

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