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Posted to commits@cassandra.apache.org by "Jordan West (Jira)" <ji...@apache.org> on 2022/12/13 20:23:00 UTC
[jira] [Updated] (CASSANDRA-18116) Denylist can load perpetually and too frequently if it fails persistently
[ https://issues.apache.org/jira/browse/CASSANDRA-18116?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]
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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