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https://issues.apache.org/jira/browse/CASSANDRA-8679?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=14301879#comment-14301879
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Aleksey Yeschenko commented on CASSANDRA-8679:
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All right. I see how this would be useful to you, although I do think you
should either remodel or have ntp on your clients.
That said, it's a very niche request. We don't want to return all the applied
results - that's not what most users would want to, on successful execution -
and adding logic to select which values are server generated, and which aren't,
at the level of Paxos would require reingeneering our LWT implementation. It's
not a simple piece of code, but it's very stable now, and I'd prefer to not
disrupt it and risk breakage for a niche feature request.
Sorry.
> Successful LWT INSERT should return any server generated values
> ---------------------------------------------------------------
>
> Key: CASSANDRA-8679
> URL: https://issues.apache.org/jira/browse/CASSANDRA-8679
> Project: Cassandra
> Issue Type: Wish
> Reporter: Nils Kilden-Pedersen
>
> A failed LWT INSERT returns the row that prevented insertion, along with
> {{[applied]}} boolean value. A successful LWT INSERT only returns
> {{[applied]}}.
> It would be helpful to also return any other server generated values, e.g.
> {{NOW()}} as {{[now]}} (or whatever).
> There is currently no way to know what exactly was inserted without
> re-querying the row, which is horrible for write-throughput.
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