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https://issues.apache.org/jira/browse/CASSANDRA-19947?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=17913399#comment-17913399
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Bernardo Botella Corbi commented on CASSANDRA-19947:
----------------------------------------------------

The errors are basically failed writes because the constraint wasn't matched, 
and the return is an invalid request. So they are expected.

As per the 5%... Yeah! But there are other things as well.

- No constraints defined does not impact performance, which is a good thing.
- It is not increased when adding more constraints, which is a good thing as 
well.


> CEP-42: Constraints Framework
> -----------------------------
>
>                 Key: CASSANDRA-19947
>                 URL: https://issues.apache.org/jira/browse/CASSANDRA-19947
>             Project: Apache Cassandra
>          Issue Type: Improvement
>          Components: CQL/Syntax
>            Reporter: Bernardo Botella
>            Assignee: Bernardo Botella
>            Priority: Normal
>         Attachments: ci_summary.html
>
>          Time Spent: 24.5h
>  Remaining Estimate: 0h
>
> Add new Constraints framework as described in CEP-42. This initial Jira 
> ticket includes the core constraints length and numeric. Follow up tickets 
> will include the rest of the constraints described in the CEP.
>  
> [https://cwiki.apache.org/confluence/display/CASSANDRA/CEP-42%3A+Constraints+Framework]



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