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https://issues.apache.org/jira/browse/CASSANDRA-15408?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16971682#comment-16971682
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Leon Zaruvinsky commented on CASSANDRA-15408:
---------------------------------------------

Hey Aleksey - What are your thoughts on just adding a retroactive change log 
signifying this break?  While these keywords are no longer used, this is still 
an API break in 3.x which we had to deal with during a migration.

> Cassandra throws SyntaxException for obsolete keywords that Thrift API permits
> ------------------------------------------------------------------------------
>
>                 Key: CASSANDRA-15408
>                 URL: https://issues.apache.org/jira/browse/CASSANDRA-15408
>             Project: Cassandra
>          Issue Type: Bug
>            Reporter: Leon Zaruvinsky
>            Priority: Normal
>         Attachments: CASSANDRA-15408.patch
>
>
> In [this 
> refactor|https://github.com/apache/cassandra/commit/b31845c4a7982358a7c5bfd9bcf572fda6c1bfa9#diff-826a67bf1ae2e45372a35a6a2a6f3f3cL74]
>  of CFPropDefs to TableAttributes for CASSANDRA-9712, three obsolete keywords 
> were removed:
> {code:java}
>         obsoleteKeywords.add("index_interval");
>         obsoleteKeywords.add("replicate_on_write");
>         obsoleteKeywords.add("populate_io_cache_on_flush");
> {code}
>  
> The Thrift API continues to reference these keywords as deprecated, so it's 
> not clear that they are actually unsupported.
> Could we either add them back as obsoleteKeywords, or add a change log that 
> statements with these properties will fail (There is already a changelog 
> about "index_interval" but not the other two)?  I understand that the Thrift 
> API is totally deprecated so I don't feel strongly about cleaning it up.



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