[
https://issues.apache.org/jira/browse/CASSANDRA-1191?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12894184#action_12894184
]
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.
