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https://issues.apache.org/jira/browse/CASSANDRA-15350?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16962289#comment-16962289
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Yifan Cai commented on CASSANDRA-15350:
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||Branch||Diff||Tests||
|[cas-exception-changes|https://github.com/yifan-c/cassandra/tree/cas-exception-changes]|[diff|https://github.com/apache/cassandra/compare/trunk...yifan-c:cas-exception-changes]|[tests|https://circleci.com/workflow-run/67f7d98f-5c2b-4b2c-9fd7-120862e554e7]|
Changes:
# Added {{CasWriteTimeoutException}} and {{CasWriteUncertaintyException}}
# Added {{encode}}/{{decode}}/{{encodeSize}} for the new exceptions. Test
cases added in ErrorMessageTest
# Modified {{MessageFilters}} in dtest to support constructing CAS scenario.
# Added CasWriteTest.
# Minor changes
** Calculate the exact UTF-8 string byte size in CBUtil to reduce unnecessary
memory allocation, (over-estimating with utf8MaxBytes)
** Corrected {{assertRows}} parameters sequence
** Moved {{DatabaseDescriptor}} initialization for dtest to test base class.
> 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
> Priority: Normal
> Labels: client-impacting, protocolv5
>
> 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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