Michael Semb Wever created CASSANDRA-20536:
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             Summary: CCM improved support for upgrade tests between different 
cluster types
                 Key: CASSANDRA-20536
                 URL: https://issues.apache.org/jira/browse/CASSANDRA-20536
             Project: Apache Cassandra
          Issue Type: Improvement
          Components: Tool/CCM
            Reporter: Michael Semb Wever
            Assignee: Michael Semb Wever


cassandra-dtests perform upgrade tests
for example, see 
https://github.com/apache/cassandra-dtest/tree/trunk/upgrade_tests

The ccm tool should be able to support this same capability for upgrades across 
different cluster types ( ref CASSANDRA-20456 ).

This patch fixes/improves a few low-level aspects of 20456 to make such 
mix-type upgrades possible.

Specifically, these are
 - the cluster and node handling of determining the cassandra version from 
build directories,
 - the ability to switch between JAVAx_HOME configured jdks, and
 - failure handling and error messaging around the use of generatetokens.

Patch: 
https://github.com/apache/cassandra-ccm/compare/trunk...thelastpickle:cassandra-ccm:mck/upgrade-tests-fixes



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