Ekaterina Dimitrova created CASSANDRA-16852:
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             Summary: 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
            Reporter: Ekaterina Dimitrova



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 route 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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