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https://issues.apache.org/jira/browse/CASSANDRA-20204?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=17913276#comment-17913276
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Andres de la Peña commented on CASSANDRA-20204:
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Guardrails are only applied to regular users, admin and internal are excluded. 
Could it be that? I think dtest queries usually run with admin, and regular 
tests run with the internal one.

{{GuardrailViewsPerTableTest}} inherits from 
{{{}o.a.c.distributed.test.guardrails.GuardrailTester{}}}, which creates and 
uses a non-admin user, [here|#L68-L79].

For utests, {{o.a.c.db.guardrails.GuardrailTester}} does the same 
[here|https://github.com/apache/cassandra/blob/trunk/test/unit/org/apache/cassandra/db/guardrails/GuardrailTester.java#L134-L151].

> Materialized view guardrail thresholds do not work in practice
> --------------------------------------------------------------
>
>                 Key: CASSANDRA-20204
>                 URL: https://issues.apache.org/jira/browse/CASSANDRA-20204
>             Project: Apache Cassandra
>          Issue Type: Bug
>          Components: Feature/Guardrails
>            Reporter: Brandon Williams
>            Priority: Normal
>             Fix For: 4.1.x, 5.0.x, 5.x
>
>
> Though we have a [unit 
> test|https://github.com/apache/cassandra/blob/trunk/test/unit/org/apache/cassandra/db/guardrails/GuardrailViewsPerTableTest.java]
>  covering it, in practice the materialized_views_per_table thresholds do not 
> seem to take effect.  This can be seen for the fail threshold in [this 
> dtest|https://github.com/driftx/cassandra-dtest/commit/bde91660669108f3e8a23da8e9abea37cecfd071]
>  which also does not work for the warn threshold.



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