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Benedict Elliott Smith edited comment on CASSANDRA-17164 at 1/26/22, 2:20 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.
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 a timestamp, and then proceeds to accept a different one
with the same timestamp. 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.
> 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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