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https://issues.apache.org/jira/browse/CASSANDRA-13419?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Benedict Elliott Smith updated CASSANDRA-13419:
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Component/s: Feature/Lightweight Transactions
> Relax limit on number of pending endpoints during CAS
> -----------------------------------------------------
>
> Key: CASSANDRA-13419
> URL: https://issues.apache.org/jira/browse/CASSANDRA-13419
> Project: Cassandra
> Issue Type: Improvement
> Components: Feature/Lightweight Transactions, Legacy/Coordination,
> Legacy/CQL
> Reporter: Ariel Weisberg
> Assignee: Ariel Weisberg
> Priority: Normal
> Labels: LWT
>
> CASSANDRA-8346 avoids stale reads during CAS when checking the condition or
> doing serial reads by disallowing more than one pending endpoint.
> It seems like it should be possible to allow more than one pending endpoint
> by being smarter about who we read from during the QUORUM read or about the
> state of pending nodes that are there for host replacement.
> Sylvain suggested
> bq. Well, I guess things are working as they do for decently good reason
> here. That said, thinking about it, it could be that the solution from
> CASSANDRA-8346 is a bit of a big hammer: I believe it's enough to ensure that
> we read from at least one replica that responded to PREPARE 'in the same
> Paxos round' But we have timeouts on the paxos round, so it could be it is
> possible to reduce drastically the time we consider a node pending for CAS so
> that it's not a real problem in practice. Something like having pending node
> move to a "almost there" state before becoming true replica, and staying in
> that state for basically the max time of a paxos round, and then Paxos might
> be able to replace "pending" nodes by those "almost there" for PREPARE.
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