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https://issues.apache.org/jira/browse/CASSANDRA-17054?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=17433833#comment-17433833
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David Capwell commented on CASSANDRA-17054:
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a lot of tests are failing, but they are also failing on trunk (reported in
slack as well), so merging even though there are many test failures...
> v4+ protocol did not clean up client warnings, which caused leaking the state
> -----------------------------------------------------------------------------
>
> Key: CASSANDRA-17054
> URL: https://issues.apache.org/jira/browse/CASSANDRA-17054
> Project: Cassandra
> Issue Type: Bug
> Components: Messaging/Client
> Reporter: David Capwell
> Assignee: David Capwell
> Priority: Normal
> Fix For: 4.0.x, 4.x
>
>
> If you perform a query in v5, this will cause the STARTUP message to be
> handled in the netty thread, but the way this is done is by calling an
> internal API to dispatcher which requires the caller to clean up; but we do
> not clean up; at this point the netty thread will have a ClientWarn state
> populated. If you now perform the same query again, but with the v3
> protocol, this will pick up the state and try to serialize it, causing a
> client error (in java as java rejects the output from the server) saying that
> v3 may not have client warnings.
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