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https://issues.apache.org/jira/browse/CASSANDRA-12175?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15379508#comment-15379508
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Aleksey Yeschenko commented on CASSANDRA-12175:
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This falls under the same category as 'raise error when using NTS with a
non-existent DC name' or 'reject 0 as RF for DC for NTS'. There are legitimate
use cases for allowing it (think a default in an automated system, that you are
meant to alter as a user). I'm going to be consistent with those other ticket
resolutions and mark this one as 'Not a Problem', too.
> Raise error on using NetworkTopologyStrategy w/o any DCs
> --------------------------------------------------------
>
> Key: CASSANDRA-12175
> URL: https://issues.apache.org/jira/browse/CASSANDRA-12175
> Project: Cassandra
> Issue Type: Improvement
> Reporter: Stefan Podkowinski
> Priority: Minor
> Labels: lhf
>
> Sometimes it happens that users will create a keyspace using
> NetworkTopologyStrategy but at the same time forget to specify the
> corresponding data-centers. The only point where you'll notice your mistake
> will be after the first insert or select statement. Even then, the error
> message can be confusing, especially for beginners.
> {noformat}
> CREATE KEYSPACE test
> WITH REPLICATION = { 'class' : 'NetworkTopologyStrategy' };
> USE test;
> CREATE TABLE airplanes (
> name text PRIMARY KEY,
> manufacturer ascii,
> year int,
> mach float
> );
> INSERT INTO airplanes
> (name, manufacturer, year, mach)
> VALUES ('P38-Lightning', 'Lockheed', 1937, 0.7);
> Unavailable: code=1000 [Unavailable exception] message="Cannot achieve
> consistency level ONE" info={'required_replicas': 1, 'alive_replicas': 0,
> 'consistency': 'ONE'}
> {noformat}
> I don't see any point why you should be able to use NetworkTopologyStrategy
> without any DCs, so I'd suggest to raise an error in this situation.
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