GitHub user lhotari added a comment to the discussion: DNS

To locate the possible source of the error logs, it would be helpful to provide 
some examples.

Appending a trailing dot to the FQDN is a standard way to prevent using 
configured search domains. This is a not-so-well-known detail of the original 
DNS RFC 1034 written in 1987. Absolute DNS names end with a dot, and relative 
names don't have a trailing dot.

I haven't tested whether this solution works with the Pulsar client. For 
example, using `pulsar://myns-pulsar-broker.myns.svc.cluster.local.:6650/` 
instead of `pulsar://somens-pulsar-broker.myns.svc.cluster.local:6650/` in the 
client. (Please notice the extra dot before `:6650`)

If this doesn't work, please file an issue at 
https://github.com/apache/pulsar/issues. Excessive error logging could be a 
separate issue.

GitHub link: 
https://github.com/apache/pulsar/discussions/24030#discussioncomment-12324345

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