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https://issues.apache.org/jira/browse/KAFKA-12193?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Mickael Maison resolved KAFKA-12193.
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Fix Version/s: 2.8.0
Resolution: Fixed
> 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
> Assignee: Bob Barrett
> Priority: Major
> Fix For: 2.8.0
>
>
> 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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