Kafka Streams Cheat Sheet

Last Updated: November 21, 2025

Topology & DSL

Construct Purpose
KStream Record stream processing
KTable Materialized view from changelog
StateStore Local store for joins/aggregations

Commands

./gradlew run
Start Streams processor
kafka-topics --describe
Check partitions/state
ksql> CREATE STREAM ...
Define stream via KSQL

Monitoring

Watch for processor-lag metrics, commit interval, and rebalances in production dashboards.

💡 Pro Tip: Use compacted topics for changelog/state stores and monitor lag per partition.
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