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https://issues.apache.org/jira/browse/CASSANDRA-15319?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16925779#comment-16925779
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Jon Meredith commented on CASSANDRA-15319:
------------------------------------------

Here's a set of PRs that introduces rack awareness for in-JVM dtests and adds 
support for tracing. The MessageForwardingTest
 uses both of them to send 100 messages and verifies that the remote nodes 
receive the right number of
 messages (there was a double-forwarding bug introduced with TR that this test 
found that [~iamaleksey] has already fixed on trunk)

There's a few other small cleanups to the in-JVM code, including closing the 
test cluster in the RepairTest.

2.2 [changes |https://github.com/apache/cassandra/pull/354] | [CircleCI 
|https://circleci.com/workflow-run/92d23778-f8dc-4317-a780-4b88f244ebc7]
 3.0 [changes |https://github.com/apache/cassandra/pull/355] | [CircleCI 
|https://circleci.com/workflow-run/12d525a2-9937-40f8-b602-79909eaaa0ac]
 3.11 [changes |https://github.com/apache/cassandra/pull/356] | [CircleCI 
|https://circleci.com/workflow-run/28e20dcd-1d06-4129-801f-5865caf6c915]
 trunk [changes |https://github.com/apache/cassandra/pull/357] | [CircleCI 
|https://circleci.com/workflow-run/cf57fe2e-0f0f-4d74-bad5-32c7d7fedeee]

> Add support for network topology and tracing to in-JVM dtests.
> --------------------------------------------------------------
>
>                 Key: CASSANDRA-15319
>                 URL: https://issues.apache.org/jira/browse/CASSANDRA-15319
>             Project: Cassandra
>          Issue Type: Improvement
>          Components: Test/dtest
>            Reporter: Jon Meredith
>            Priority: Normal
>              Labels: pull-request-available
>          Time Spent: 40m
>  Remaining Estimate: 0h
>
> While working on CASSANDRA-15318, testing it properly with an in-JVM test 
> requires setting up the network topology and tracing requests to check which 
> nodes performed forwarding.
>   
> In support of testing, make it possible to create in-JVM clusters with nodes 
> appearing in different datacenter/racks and add support for executing queries 
> with tracing enabled.



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