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https://issues.apache.org/jira/browse/CASSANDRA-7344?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=14038799#comment-14038799
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Sylvain Lebresne commented on CASSANDRA-7344:
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I see what you mean and I do think this should work. I think we'd need a new
Paxos message (which means this would have to target 3.0) that requests the
current paxos state without asking for a promise.
> Read at SERIAL can lead to unnecessary contention
> --------------------------------------------------
>
> Key: CASSANDRA-7344
> URL: https://issues.apache.org/jira/browse/CASSANDRA-7344
> Project: Cassandra
> Issue Type: Improvement
> Reporter: sankalp kohli
> Assignee: sankalp kohli
> Priority: Minor
>
> If two clients are doing a read at serial on the same row, it does a full
> prepare step to figure out whether there is any updates or cas in flight or
> uncompleted.
> This can cause contention between then leading to waste of time in retrying.
> One of the request will not get a promise and will need to sleep.
> Instead they can check whether there is anything to finish and if not
> continue.
> If there is something to be done, then they can do the full prepare.
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