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Confluent Developer Blog

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Apache Parquet

A Fast Path for Fixed-Length Lists in Parquet

How Hardwood detects fixed-length lists in Parquet's encoded definition and repetition levels, bypassing Dremel reconstruction for a 1.1×–3.9× parse speed-up.

Apache Kafka

Kafka Queues for Quarkus

Learn how to use Queues for Apache Kafka (KIP-932) with the Quarkus framework, including share group configuration, explicit message acknowledgment, and cooperative consumption from a single partition.

Apache Flink

How we cut Flink OOMKills by 91.2%: Zombie block cache, phantom CPUs (and some bonus AI Learnings)

How we traced a native-memory leak in Flink's RocksDB block cache and a jemalloc fragmentation bug, cutting OOMKilled Task Managers by 91.2% — plus what running the investigation with Claude taught us.