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Benedict Elliott Smith edited comment on CASSANDRA-17164 at 1/26/22, 2:18 PM:
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I think this would be fine, I need to think through why I did not do this
originally, as I did consider it. It may simply have been to minimise the
change in semantics to {{system.paxos}}, without there having been any
particularly good reason. Perhaps also for debugging purposes, it helps to be
able to see whether something had been promised before it was
accepted/committed.
I think there is perhaps also some additional complexity when a replica has
promised a ballot with the same timestamp, and then proceed to accept it. I
don't think we would resolve these reliably, so we might not actually overwrite
it anyway, and I don't think there is a trivial solution to this problem in the
storage layer. I'm not certain if this would actually cause problems, but it
would require some careful consideration to rule it out.
was (Author: benedict):
I think this would be fine, I need to think through why I did not do this
originally, as I did consider it. It may simply have been to minimise the
change in semantics to {{system.paxos}}, without there having been any
particularly good reason. Perhaps also for debugging purposes, it helps to be
able to see whether something had been promised before it was
accepted/committed.
I think there is perhaps also some additional complexity when a replica has
promised a ballot with the same timestamp, and then proceed to accept it. I
don't think we would resolve these reliably, so we might not actually overwrite
it anyway, and I don't think there is a trivial solution to this problem in the
storage layer.
> CEP-14: Paxos Improvements
> --------------------------
>
> Key: CASSANDRA-17164
> URL: https://issues.apache.org/jira/browse/CASSANDRA-17164
> Project: Cassandra
> Issue Type: Improvement
> Components: Consistency/Coordination, Consistency/Repair
> Reporter: Benedict Elliott Smith
> Assignee: Benedict Elliott Smith
> Priority: Normal
> Fix For: 4.1
>
>
> This ticket encompasses work for [CEP-14|
> https://cwiki.apache.org/confluence/display/CASSANDRA/CEP-14%3A+Paxos+Improvements].
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