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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