[jira] [Created] (CASSANDRA-18116) Denylist can load perpetually and too frequently if it fails persistently

["Jordan West (Jira)" <ji...@apache.org>]

Jordan West created CASSANDRA-18116:
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             Summary: 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
            Reporter: Jordan West
            Assignee: Jordan West


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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