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Build a stateful Kafka Streams application with event-time windows, local RocksDB stores, changelog recovery, exactly-once Kafka processing, and an idempotent PostgreSQL materialized view.
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- Published on
Use Redisson locks safely in Spring Boot by choosing the right transaction boundary, understanding watchdog and lease behavior, enforcing idempotency, and adding fencing tokens for stale lock holders.- Published on
Plan an expand-migrate-contract rollout for PostgreSQL and Kafka with compatible Spring Boot deployments, chunked backfills, transactional outbox or CDC, validation gates, and safe cleanup.- Published on
Instrument a Spring Boot service with Prometheus metrics, native structured logging, OpenTelemetry tracing over OTLP, safe cardinality rules, and a practical Grafana observability workflow.- Published on
Persist external-call intent with business data, claim work safely across replicas, classify retries, handle ambiguous HTTP outcomes, and use Kafka only through a durable outbox or CDC boundary.