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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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Bug Category: Parent values: Degradation(12984)Level 1 values: Other
Exception(12998)
Complexity: Low Hanging Fruit
Component/s: Feature/Rate Limiting
Discovered By: User Report
Fix Version/s: 4.0.x
4.1.x
Severity: Normal
Status: Open (was: Triage Needed)
> 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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