Brad Schoening created CASSJAVA-98:
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Summary: Replace warning message when contact points from a
different DC
Key: CASSJAVA-98
URL: https://issues.apache.org/jira/browse/CASSJAVA-98
Project: Apache Cassandra Java driver
Issue Type: Improvement
Reporter: Brad Schoening
We get a lot of questions from users about this WARN level message in the Java
driver 4.3+:
{quote}You specified dc1 as the local DC, but some contact points are from a
different DC: Node(...); please provide the correct local DC, or check your
contact points{quote}
but as [@Erick Ramirez|https://the-asf.slack.com/team/URU06R75L] explains on a
[StackOverflow
answer|https://stackoverflow.com/questions/75799274/how-are-quorum-reads-handled-when-the-java-driver-only-contacts-nodes-in-local-d]
this topic, "The contact points do not have anything to do with replicas and
consistency levels."
This warning was added in 4.3, before cross-DC failover was re-introduced in
release 4.10. Although I realize cross-DC failover is problematic, this message
does not seem helpful or at the very least should be INFO instead of WARN.
My App 1 may run in DC1 and App 2 in DC2, but they can share the same contact
lists and implement their own failover when necessary, but without needing to
update contact points.
It would be more reasonable to WARN when you've configured
*advanced.load-balancing-policy.dc-failover.allow-for-local-consistency-levels*
as True. Warning on the contact points specified doesn't seem right.
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