KIP-64 — Allow underlying distributed filesystem to take over replication depending on configuration

Discussion Broker

KIP-64 proposes a broker config to delegate replication entirely to the underlying distributed filesystem (e.g. NFS/SMB-mounted HDFS or GlusterFS), treating a successful `flush()` as a signal that all ISR replicas have the data and disabling Kafka's own replication traffic. This eliminates redundant data copies and inter-broker replication overhead when the storage layer already provides its own fault-tolerant replication.

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