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https://issues.apache.org/jira/browse/CASSANDRA-7954?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=14140755#comment-14140755
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Benedict commented on CASSANDRA-7954:
-------------------------------------
To clarify, if the owning node is down, with RF=1 we cannot fulfil any
consistency level with hinting, and cannot possibly perform our
read-before-write, so the coordinators absolutely require the owning node to be
up to fulfil the request. If the request is sent by the coordinator to the
owning node, and applied conditionally locally by the owning node, with the
result of the conditional update being returned to the coordinator, no paxos is
necessary and the semantics and guarantees are the same.
> Skip paxos for CAS if RF=1
> --------------------------
>
> Key: CASSANDRA-7954
> URL: https://issues.apache.org/jira/browse/CASSANDRA-7954
> Project: Cassandra
> Issue Type: Improvement
> Components: Core
> Reporter: Benedict
> Priority: Minor
> Labels: performance
>
> If RF=1, there's no point doing a paxos round - we get just as much safety
> and atomicity by simply conditionally applying the update locally
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