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Apache Kafka: A Replayable Event Log, Not Merely a Message Queue

Kafka is a distributed log ordered by partition and retained by policy. Consumer groups divide work through offsets, while exactly-once processing holds only inside boundaries covered by Kafka transactions.

Redpanda: Kafka API Compatibility Still Requires Broker Migration Testing

Redpanda reimplements a Kafka-compatible event log with C++/Seastar, thread-per-core execution, and a Raft group per partition. Client compatibility is broad, but operational and edge semantics still require testing.