[jira] [Commented] (CASSANDRA-16873) Tolerate missing DNS entry when completing a host replacement

["Josh McKenzie (Jira)" <ji...@apache.org>]

    [ https://issues.apache.org/jira/browse/CASSANDRA-16873?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=17402319#comment-17402319 ] 

Josh McKenzie commented on CASSANDRA-16873:
-------------------------------------------

Had some flakes on unrelated JDK8 tests due to wrong circle provisiong but they cleared up on re-run on highres.
||Item||Link||
|j8 test|[link|https://app.circleci.com/pipelines/github/josh-mckenzie/cassandra/45/workflows/da69af38-582c-4ab9-bd20-3df97bed9483]|
|j11 test|[link|https://app.circleci.com/pipelines/github/josh-mckenzie/cassandra/45/workflows/c5ae66bb-11a1-4e97-8b27-397adb3af5b3]|
|branch|[link|https://github.com/apache/cassandra/commit/b57ddb7d5cba5479faceed466a5307504453eab1]|

> Tolerate missing DNS entry when completing a host replacement
> -------------------------------------------------------------
>
>                 Key: CASSANDRA-16873
>                 URL: https://issues.apache.org/jira/browse/CASSANDRA-16873
>             Project: Cassandra
>          Issue Type: Improvement
>          Components: Cluster/Membership
>            Reporter: Josh McKenzie
>            Assignee: Josh McKenzie
>            Priority: Normal
>
> In one of our deployments, after a host replacement a subset of nodes still saw the nodes as JOINING despite the rest of the cluster seeing it as NORMAL with a failure to gossip. This was traced to a DNS lookup failure on the nodes during an interim state leading to an exception being thrown and gossip state never transitioning.
> Rather than implicitly requiring operators to bounce the node by throwing an exception, we should instead suppress the exception when checking if a node is replacing the same host address and ID if we get an UnknownHostException. 



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