KIP-302 — Enable Kafka clients to use all DNS resolved IP addresses

Accepted Kafka 2.1 Client

KIP-302 adds a `use_all_dns_ips` option to the existing `client.dns.lookup` config, making Kafka clients iterate over all A records returned by DNS for a hostname rather than connecting to only the first resolved IP. This enables HA patterns where broker hostnames resolve to multiple load-balancer IPs, so a client can fail over to an alternate IP transparently instead of marking the broker as unavailable.

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