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Jonathan Koppenhofer commented on CASSANDRA-14361: -------------------------------------------------- [~smiklosovic] I would agree with this not being the default behavior, and having people configure in to this as an additional optional parameter to the seed provider. I imagine in some situations (like mine), a team may not have full control of their DNS config and infrastructure, and this could introduce risk/compatibility issues. Thanks, and nice work! > 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: Local/Config > Reporter: Ben Bromhead > Assignee: Stefan Miklosovic > Priority: Low > Fix For: 4.x > > Time Spent: 1h 20m > Remaining Estimate: 0h > > 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. -- This message was sent by Atlassian Jira (v8.20.10#820010) --------------------------------------------------------------------- To unsubscribe, e-mail: commits-unsubscr...@cassandra.apache.org For additional commands, e-mail: commits-h...@cassandra.apache.org