KIP-1008 — ParKa - the Marriage of Parquet and Kafka

Discussion ProtocolBroker

Proposes a `ParKa` format that serializes Kafka record batches in Apache Parquet columnar format rather than row-by-row Avro/JSON/Protobuf. Columnar encoding yields dramatically better compression ratios for large batches and enables predicate pushdown for consumers reading from tiered storage.

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