Field notes from running Kafka in production.
August 10, 2026
EOS delivers exactly-once processing inside a Kafka-to-Kafka pipeline — not exactly-once side effects. Where transactions earn their latency cost, and where an idempotent sink is the better buy.
Read moreJuly 13, 2026
Partition count caps your parallelism and is painful to change on a keyed topic. A worksheet method: measure per-partition throughput, size for peak plus replay headroom, check key skew.
Read moreJune 16, 2026
Compatibility modes decide your deploy order, transitive checks protect you from old data, and the rest is a short list of rules a CI gate can enforce. How to change schemas without incidents.
Read moreMay 19, 2026
KRaft is the only controller quorum in Kafka 4.x. A field checklist for the migration: pre-flight inventory, the dual-write sequence, the finalization decision, and what to monitor after.
Read moreApril 14, 2026
Rebalance storms, auto-commit data loss, lag measured in the wrong unit: the recurring consumer-group mistakes behind most Kafka incidents we see, and the specific fixes.
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