My notebook.
Things I've learned and want to remember. Written mostly for future me, but you're welcome to read along. Some are rough (🚧), some are solid.
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GraalVM native image gotchas
Native images start in milliseconds and use a fraction of the memory, but the closed-world assumption bites in surprising places.
How Kafka consumer group rebalancing works
When a consumer joins or leaves a group, Kafka reassigns partitions across the remaining members. During an eager rebalance every consumer stops, gives up all…
Idempotent retries in payment systems
Why every payment API needs an idempotency key, and how to store it.