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https://issues.apache.org/jira/browse/CASSANDRA-17949?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=17683540#comment-17683540
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Ekaterina Dimitrova commented on CASSANDRA-17949:
-------------------------------------------------

Committed 
[[4609ac4..c51c655|https://github.com/riptano/ccm/commit/c51c655973e6873f272f77b95185235002a2c0a9]4609ac4..c51c655],
 also fixed the formatting a bit as it was off (too long lines). Thanks.

> Update CCM post CASSANDRA-17379
> -------------------------------
>
>                 Key: CASSANDRA-17949
>                 URL: https://issues.apache.org/jira/browse/CASSANDRA-17949
>             Project: Cassandra
>          Issue Type: Task
>          Components: CI
>            Reporter: Ekaterina Dimitrova
>            Priority: Normal
>
> We updated in CASSANDRA-15234 CCM updateconf to enable it to handle 
> overloading of parameters Python upgrade tests. 
> This also allows us not to update for 4.1 the Python DTests but exercise the 
> backward compatibility we have in C* in our tests.
> Now CASSANDRA-17379 added a few flags to opt in or out for overloading of 
> parameters.
> The default points to -Dcassandra.allow_new_old_config_keys=false but this 
> does not affect our tests as CCM handles the overloading in the yaml.
> But this is confusing for users and might lead to issues.
> We need to bring on par one way or another ccm with the new flags introduced 
> in CASSANDRA-17379
> *Until then the recommendation is to use 
> `-Dcassandra.allow_new_old_config_keys=false` and  
> `-Dcassandra.allow_duplicate_config_keys=false` to prohibit any kind of 
> overloading when using CCM master and CCM released to prevent any confusion.*



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