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https://issues.apache.org/jira/browse/CASSANDRA-14361?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16425809#comment-16425809
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Ben Bromhead commented on CASSANDRA-14361:
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I would argue you need to be intentional about your DNS records, but I'm 
willing to concede that it moves config further away from the system which can 
hide the reason for behavior.

Would it be worth adding some info/debug level logging around what IPs got 
resolved for each time getSeeds() gets called?

At least that way the behavior of what gets looked up is observable and the 
answer to any potential WTFs is in the logs. 

> Allow SimpleSeedProvider to resolve multiple IPs per DNS name
> -------------------------------------------------------------
>
>                 Key: CASSANDRA-14361
>                 URL: https://issues.apache.org/jira/browse/CASSANDRA-14361
>             Project: Cassandra
>          Issue Type: Improvement
>          Components: Configuration
>            Reporter: Ben Bromhead
>            Assignee: Ben Bromhead
>            Priority: Minor
>             Fix For: 4.0
>
>
> Currently SimpleSeedProvider can accept a comma separated string of IPs or 
> hostnames as the set of Cassandra seeds. hostnames are resolved via 
> InetAddress.getByName, which will only return the first IP associated with an 
> A, AAAA or CNAME record.
> By changing to InetAddress.getAllByName, existing behavior is preserved, but 
> now Cassandra can discover multiple IP address per record, allowing seed 
> discovery by DNS to be a little easier.
> Some examples of improved workflows with this change include: 
>  * specify the DNS name of a headless service in Kubernetes which will 
> resolve to all IP addresses of pods within that service. 
>  * seed discovery for multi-region clusters via AWS route53, AzureDNS etc
>  * Other common DNS service discovery mechanisms.
> The only behavior this is likely to impact would be where users are relying 
> on the fact that getByName only returns a single IP address.
> I can't imagine any scenario where that is a sane choice. Even when that 
> choice has been made, it only impacts the first startup of Cassandra and 
> would not be on any critical path.



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