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From "Gary Dusbabek (JIRA)" <j...@apache.org>
Subject [jira] Commented: (CASSANDRA-1191) Make Strategy classes fail if asked to fulfil an impossible replication request
Date Fri, 30 Jul 2010 22:39:18 GMT

    [ https://issues.apache.org/jira/browse/CASSANDRA-1191?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12894182#action_12894182
] 

Gary Dusbabek commented on CASSANDRA-1191:
------------------------------------------

It worked before, and I don't think it's unreasonable to "seed" a single node with keyspaces
before bringing other nodes online.  If this isn't the case, we'll want to spell that out
clearly: load your schema *after* you have enough nodes online to support full replication.

> 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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