Bob Barrett created KAFKA-12193:
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Summary: Re-resolve IPs when a client is disconnected
Key: KAFKA-12193
URL: https://issues.apache.org/jira/browse/KAFKA-12193
Project: Kafka
Issue Type: Bug
Components: clients
Affects Versions: 2.7.0
Reporter: Bob Barrett
If `client.dns.lookup` is set to `use_all_dns_ips` or
`resolve_canonical_bootstrap_servers_only`, the NetworkClient can store
multiple IPs for each node, and currently it tries each IP in the list when
connecting before re-resolving the IPs. This is useful when first establishing
a connection because it ensures that the client exhausts all possible IPs.
However, in the case where the IPs changed after a connection was already
established, this would cause a reconnecting client to try several invalid IPs
before re-resolving and trying a valid one. Instead, we should re-resolve DNS
when a client disconnects from an established connection, rather than assuming
the all previously-resolved IPs are still valid.
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