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https://issues.apache.org/jira/browse/CASSANDRA-17379?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=17493358#comment-17493358
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David Capwell commented on CASSANDRA-17379:
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what if we block by default with an escape hatch? If tools are creating the
YAML they may need time to fix, so a system property to go back to the old
behavior could be a solution? So fail by default, opt-out if requested?
> Fail starting when the same parameter exists more than once with different
> values in cassandra.yaml
> ----------------------------------------------------------------------------------------------------
>
> Key: CASSANDRA-17379
> URL: https://issues.apache.org/jira/browse/CASSANDRA-17379
> Project: Cassandra
> Issue Type: Improvement
> Components: Local/Config
> Reporter: Ekaterina Dimitrova
> Assignee: Marcus Eriksson
> Priority: Low
> Fix For: 4.x
>
>
> The way that SnakeYAML works, if someone has added the same parameter more
> than once - the last occurrence will be the one that will take precedence.
> Now after CASSANDRA-15234 we can even add the parameter with the old name and
> with the new name and the occurrences will replace each other. Again,
> whatever is last in cassandra.yaml will take precedence. Example:
> If you add the following in cassandra.yaml
> {code:java}
> hinted_handoff_enabled: true
> enabled_hinted_handolff: false
> {code}
> you will get loaded in Config -
> {code:java}
> hinted_handoff_enabled: false{code}
> //there is backward compatibility from the old name to load into the new one
> Currently Cassandra prints in the logs what config was loaded but it is good
> also to detect the case mentioned and emit a warning for the user so they can
> verify that the value they wanted was loaded in config.
> To do that you might want to look at the PropertiesChecker and the way we
> emit other warnings in
> [check()|https://github.com/apache/cassandra/blob/trunk/src/java/org/apache/cassandra/config/YamlConfigurationLoader.java#L376]
> in YamlConfigurationLoader.
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