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https://issues.apache.org/jira/browse/CASSANDRA-6012?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Sylvain Lebresne updated CASSANDRA-6012:
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Since Version: 2.0
Fix Version/s: 2.0.1
> CAS does not always correctly replay inProgress rounds
> ------------------------------------------------------
>
> Key: CASSANDRA-6012
> URL: https://issues.apache.org/jira/browse/CASSANDRA-6012
> Project: Cassandra
> Issue Type: Bug
> Reporter: Sylvain Lebresne
> Assignee: Sylvain Lebresne
> Fix For: 2.0.1
>
> Attachments:
> 0001-Don-t-skip-paxos-old-round-replay-if-there-is-a-value-.txt
>
>
> Paxos says that on receiving the result of a prepare from a quorum of
> acceptors, the proposer should propose the value of the higher-number
> proposal accepted amongst the ones returned by the acceptors, and only
> propose his own value if no acceptor has send us back a previously accepted
> value.
> But in PrepareCallback we only keep the more recent inProgress commit
> regardless of whether is has an update. Which means we could ignore a value
> already accepted by some acceptors if any of the acceptor send us a more
> recent ballot than the other acceptor but with no values. The net effect is
> that we can mistakenly accept two different values for the same round.
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