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https://issues.apache.org/jira/browse/CASSANDRA-16852?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=17398340#comment-17398340
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Ekaterina Dimitrova commented on CASSANDRA-16852:
-------------------------------------------------

For the record, there was a suggestion that this issue might be caused by 
CASSANDRA-16827 but testing shows that it existed before that. 

> testsome fails in the CircleCI multiplexer because the class JStackJUnitTask 
> can't be found
> -------------------------------------------------------------------------------------------
>
>                 Key: CASSANDRA-16852
>                 URL: https://issues.apache.org/jira/browse/CASSANDRA-16852
>             Project: Cassandra
>          Issue Type: Bug
>          Components: CI
>            Reporter: Ekaterina Dimitrova
>            Assignee: Ekaterina Dimitrova
>            Priority: Normal
>             Fix For: 3.11.x
>
>
> As [~adelapena] explained on 
> [CASSANDRA-16827|https://issues.apache.org/jira/browse/CASSANDRA-16827?focusedCommentId=17398060&page=com.atlassian.jira.plugin.system.issuetabpanels%3Acomment-tabpanel#comment-17398060],
>  the problem might be in the flag _-Dno-build-test=true_ that the multiplexer 
> uses to not run _build-test_ in every iteration, relying on that this has 
> already been  done by the build task. This is a performance optimisation that 
> can be especially effective in fast tests.
> It would be ideal to have the initial multiplexer behavior restored, but we 
> can always run _ant build-test_ at the beginning of every multiplexer runner 
> while still not running it on every iteration. This seems enough to keep the 
> multiplexer working but it requires some extra builds and therefore higher 
> costs.
> The goal of this ticket is to find the root of this failure and fix the 
> multiplexer either by restoring its initial flow or adding _ant build-test_ 
> at the beginning of every multiplexer runner, if there is no more effective 
> solution. 



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