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https://issues.apache.org/jira/browse/CASSANDRA-18116?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Jordan West updated CASSANDRA-18116:
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Test and Documentation Plan: Existing tests (exploring if I can add one
more to produce this case and show how reads trigger a load of the denylist)
Status: Patch Available (was: Open)
[https://github.com/jrwest/cassandra/tree/jwest/18116-4.1]
Tests:
[j8|https://app.circleci.com/pipelines/github/jrwest/cassandra/128/workflows/474f1780-f3e5-4c61-8c26-c0ddf3408017]
[j11|https://app.circleci.com/pipelines/github/jrwest/cassandra/128/workflows/2fe470f3-6743-42e6-b4ab-5d8399a9e814]
> Denylist can load perpetually and too frequently if it fails persistently
> --------------------------------------------------------------------------
>
> Key: CASSANDRA-18116
> URL: https://issues.apache.org/jira/browse/CASSANDRA-18116
> Project: Cassandra
> Issue Type: Bug
> Components: Feature/Rate Limiting
> Reporter: Jordan West
> Assignee: Jordan West
> Priority: Normal
> Fix For: 4.0.x, 4.1.x
>
>
> When the denylist fails its initial load it can [return a value of
> null|https://github.com/apache/cassandra/blob/trunk/src/java/org/apache/cassandra/schema/PartitionDenylist.java#L453]
> for a key in the cache. The [BoundedLoadingCache
> implementation|https://github.com/ben-manes/caffeine/blob/master/caffeine/src/main/java/com/github/benmanes/caffeine/cache/BoundedLocalCache.java#L2591-L2615]
> that is used treats null as missing and will end up trying to load the key
> on reads. Besides the performance impact this can also lead to significant
> log spam leading to disk or CPU usage issues.
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