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Jonathan Ellis commented on CASSANDRA-1191: ------------------------------------------- i dunno, when asked to do something impossible we have the choice of refusing, or taking our best guess as to what the user "really" means -- e.g. treat RF as min(node count, RF). i'd much rather refuse to guess, especially when the inconvenience caused is so low. > 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. -- This message is automatically generated by JIRA. - You can reply to this email to add a comment to the issue online.