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Cristian Opris commented on CASSANDRA-5062:
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The read path is not detailed in your document. Also even with 500 lines of
code and explanations, there can be ambiguities.
It's not obvious to me that you intended read to repair N rounds of paxos
before responding. Yes, could work but I don't feel it's
the best way to do it.
Sorry if you feel that I'm spamming this Jira but:
- It's the only forum I have available. I can't post to the mailing list for
objective reasons.
- you guys can be very selective in what comments you actually care to respond
to. I've been going on about version counters and separating rounds for a long
time here without getting any interest but then you come back and propose
something very similar. Since you posted it I thought you're looking for some
actual review and feedback.
bq. in practice, learn messages won't be lost randomly as in your example
This is really not an assumption I would make. Why even bother with Paxos if
nothing can go wrong anyway ?
> Support CAS
> -----------
>
> Key: CASSANDRA-5062
> URL: https://issues.apache.org/jira/browse/CASSANDRA-5062
> Project: Cassandra
> Issue Type: New Feature
> Components: API, Core
> Reporter: Jonathan Ellis
> Fix For: 2.0
>
> Attachments: half-baked commit 1.jpg, half-baked commit 2.jpg,
> half-baked commit 3.jpg
>
>
> "Strong" consistency is not enough to prevent race conditions. The classic
> example is user account creation: we want to ensure usernames are unique, so
> we only want to signal account creation success if nobody else has created
> the account yet. But naive read-then-write allows clients to race and both
> think they have a green light to create.
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