clintropolis commented on issue #9166: use Caffeine instead of Guava Cache URL: https://github.com/apache/druid/pull/9166#issuecomment-578107415 Looks like there is a legit [checkstyle CI failure](https://travis-ci.org/apache/druid/jobs/639561475#L624): ``` [ERROR] /home/travis/build/apache/druid/extensions-core/lookups-cached-single/src/main/java/org/apache/druid/server/lookup/LoadingLookup.java:33:8: Unused import - java.util.concurrent.Callable. [UnusedImports] ```
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