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https://issues.apache.org/jira/browse/CASSANDRA-15350?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=17027710#comment-17027710
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Alex Petrov commented on CASSANDRA-15350:
-----------------------------------------
I've pushed a rebased branch with minor improvements
[here|https://github.com/ifesdjeen/cassandra/tree/cas-exception-changes], tests
running
[here|https://circleci.com/gh/ifesdjeen/cassandra/tree/cas-exception-changes].
I'd propose to use fuzz tests instead of cascades of latches. If we could
implement a simple test to reproduce (any) contention in this fashion, it'd be
great. Could you implement it?
Other than that, I'm +1 and ready to commit when contention fuzz test is added.
> Add CAS “uncertainty” and “contention" messages that are currently propagated
> as a WriteTimeoutException.
> ---------------------------------------------------------------------------------------------------------
>
> Key: CASSANDRA-15350
> URL: https://issues.apache.org/jira/browse/CASSANDRA-15350
> Project: Cassandra
> Issue Type: Improvement
> Components: Feature/Lightweight Transactions
> Reporter: Alex Petrov
> Assignee: Yifan Cai
> Priority: Normal
> Labels: protocolv5, pull-request-available
> Attachments: Utf8StringEncodeBench.java
>
> Time Spent: 20m
> Remaining Estimate: 0h
>
> Right now, CAS uncertainty introduced in
> https://issues.apache.org/jira/browse/CASSANDRA-6013 is propagating as
> WriteTimeout. One of this conditions it manifests is when there’s at least
> one acceptor that has accepted the value, which means that this value _may_
> still get accepted during the later round, despite the proposer failure.
> Similar problem happens with CAS contention, which is also indistinguishable
> from the “regular” timeout, even though it is visible in metrics correctly.
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