Make Strategy classes fail if asked to fulfil an impossible replication request
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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
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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