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The "FAQ" page has been changed by JonathanEllis: https://wiki.apache.org/cassandra/FAQ?action=diff&rev1=160&rev2=161 Comment: add clocktie FAQ * [[#dropped_messages|Why do I see "... messages dropped.." in the logs?]] * [[#cli_keys|Why does the 0.8 cli not assume keys are strings anymore?]] * [[#memlock|Cassandra dies with "java.lang.OutOfMemoryError: Map failed"]] - * [[#opp|Why should I avoid order-preserving partitioners]] + * [[#opp|Why should I avoid order-preserving partitioners?]] + * [[#clocktie|What happens if two updates are made with the same timestamp?]] <<Anchor(cant_listen_on_ip_any)>> @@ -512, +513 @@ == Why should I avoid order-preserving partitioners? == See [Partitioners]. + <<Anchor(clocktie)>> + == What happens if two updates are made with the same timestamp? == + + Updates must be commutative, since they may arrive in different orders on different replicas. Thus, in the case of a timestamp tie, Cassandra follows two rules: first, deletes take precedence over inserts/updates. Second, if there are two updates, the one with the lexically larger value is selected. +
