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https://issues.apache.org/jira/browse/CASSANDRA-10404?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16222343#comment-16222343
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Jason Brown commented on CASSANDRA-10404:
-----------------------------------------

bq. add a simple config validation in DatabaseDescriptor and throw a 
ConfigurationException in case cassandra.yaml hasn't been updated correctly 
during the upgrade

Done, and pushed up a commit

Also, I discovered a long dead config entry, {{Config#encryption_options}}. 
Apparently, I deprecated that 5 years ago as part of CASSANDRA-4239 as it was 
renamed to {{Config#server_encryption_options}}. Thus, I've removed it and the 
{{DatabaseDescriptor}} check, as well. I knew someday I'd come back to get it!

[[email protected]] If the code is at this point, I'll move on to fixing up the 
yaml comments and NEWS.txt. I'd like to create a separate ticket for updating 
the docs page as I'd like to expand it, a lot. wdyt?



> Node to Node encryption transitional mode
> -----------------------------------------
>
>                 Key: CASSANDRA-10404
>                 URL: https://issues.apache.org/jira/browse/CASSANDRA-10404
>             Project: Cassandra
>          Issue Type: New Feature
>            Reporter: Tom Lewis
>            Assignee: Jason Brown
>             Fix For: 4.x
>
>
> Create a transitional mode for encryption that allows encrypted and 
> unencrypted traffic node-to-node during a change over to encryption from 
> unencrypted. This alleviates downtime during the switch.
>  This is similar to CASSANDRA-10559 which is intended for client-to-node



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