Sanjay Dutt created SOLR-18583:
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Summary: TestCaffeineCache and TestThinCache testSimple fail on
Caffeine 3.3.0
Key: SOLR-18583
URL: https://issues.apache.org/jira/browse/SOLR-18583
Project: Solr
Issue Type: Bug
Components: search
Affects Versions: 9.12
Reporter: Sanjay Dutt
Assignee: Sanjay Dutt
Since branch_9x moved to Caffeine 3.3.0 (#4976), TestCaffeineCache.testSimple
and TestThinCache.testSimple failed on every run, at
assertNull(lfuCache.get(1)).
Caffeine evicts based on usage, not insertion order. Before 3.3.0, small caches
forgot early usage at half capacity, so key 1 happened to be evicted. 3.3.0
(ben-manes/caffeine commit 6f57cf5567) keeps it, so a different entry is
evicted. In TestThinCache the same change also evicts the warmed entries from
the full shared backing cache.
Fixed on branch_9x in #5207: assert that one entry is evicted rather than which
one, and enlarge the backing before warming (same as #5029).
main and branch_10x are still on Caffeine 3.2.4, so they pass today, but they
need the same change when they move to 3.3.0.
Related: SOLR-18506 / #5029.
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