[jira] [Resolved] (KAFKA-12193) Re-resolve IPs when a client is disconnected

["Mickael Maison (Jira)" <ji...@apache.org>]

     [ https://issues.apache.org/jira/browse/KAFKA-12193?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]

Mickael Maison resolved KAFKA-12193.
------------------------------------
    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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