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https://issues.apache.org/jira/browse/CASSANDRA-1191?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12894180#action_12894180
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Jonathan Ellis commented on CASSANDRA-1191:
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if you have a nonsensical RF how can you even try to calculate pending ranges?
i think "don't create KS with RF > node count" is a reasonable restriction. if
you plan to add nodes to make it sane, then do that first instead of the other
way around. (similarly, "don't create KS when so much of your cluster is down
that node count < RF" is also reasonable.)
> Make Strategy classes fail if asked to fulfil an impossible replication
> request
> -------------------------------------------------------------------------------
>
> Key: CASSANDRA-1191
> URL: https://issues.apache.org/jira/browse/CASSANDRA-1191
> Project: Cassandra
> Issue Type: Improvement
> Components: Core
> Reporter: Jonathan Ellis
> Assignee: Matthew F. Dennis
> Priority: Minor
> Fix For: 0.7 beta 1
>
> Attachments: trunk-1191.txt
>
>
> I added to RSECT in CASSANDRA-1147,
> // TODO DSS is asked to provide a total of 6 replicas, but we never
> give it 6 endpoints.
> // thus we are testing undefined behavior, at best.
> This is easiest to cause in DSS but it can afflict other Strategies too.
> Let's update the ARS contract to state that calculateNaturalEndpoints (hence
> getNaturalEndpoints too) will throw IllegalStateException if more replicas
> are requested than the known endpoints (for DSS, this would apply on a per-DC
> basis) and amend the Strategy classes to check for this.
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