Ariel Weisberg created CASSANDRA-19551:
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Summary: CCM nodes share the same environment variable map
breaking upgrade tests
Key: CASSANDRA-19551
URL: https://issues.apache.org/jira/browse/CASSANDRA-19551
Project: Cassandra
Issue Type: Bug
Components: Test/dtest/python
Reporter: Ariel Weisberg
In {{node.py}} {{__environment_variables}} is generally always set with a map
that is passed in from {{cluster.py}} so it is [shared between
nodes](https://github.com/riptano/ccm/blob/ac264706c8ca007cc584871ce907d48db334d36d/ccmlib/node.py#L151)
and if nodes modify the map, such as in {{start}} when [updating the Java
version](https://github.com/riptano/ccm/blob/ac264706c8ca007cc584871ce907d48db334d36d/ccmlib/node.py#L860)
then when {{get_env}} runs it will [overwrite the Java
version](https://github.com/riptano/ccm/blob/ac264706c8ca007cc584871ce907d48db334d36d/ccmlib/node.py#L244)
that is selected by {{update_java_version}}.
This results in {{nodetool drain}} failing when upgrading from 3.11 to 4.0 in
some of the upgrade tests because after the first node upgrades to 4.0 it's not
longer possible for the subsequent nodes to select a Java version that isn't 11
because it's overridden by {{__environment_variables}}.
I'm not even 100% clear on why the code in {{start}} should update
{{__environment_variables}} at all if we calculate the correct java version on
every invocation of other tools.
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