[jira] [Created] (SOLR-7355) Java 8: ConcurrentLinkedHashMap -> Caffeine

["Ben Manes (JIRA)" <ji...@apache.org>]

Ben Manes created SOLR-7355:
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             Summary: Java 8: ConcurrentLinkedHashMap -> Caffeine
                 Key: SOLR-7355
                 URL: https://issues.apache.org/jira/browse/SOLR-7355
             Project: Solr
          Issue Type: Task
            Reporter: Ben Manes
            Priority: Minor


When Solr transitions to requiring Java 8, please upgrade to Caffeine. The performance should be relatively the same. The per-instance memory usage should be smaller and Solr may decide to opt-in to use some of the additional features. The only drawback is that the jar size is larger due to code generation, though that may be trimmed over time and usually is not a concern for server-side applications.

ConcurrentLinkedHashMap changes will continue to be minimal, even more so now, and driven by requests from Java 6 users unable to upgrade. Caffeine is ideally the upgrade path for Guava cache users too, which due to Android cannot be significantly modified.

Caffeine: https://github.com/ben-manes/caffeine
Benchmarks: https://github.com/ben-manes/caffeine/wiki/Benchmarks
ConcurrentLinkedHashMap: https://code.google.com/p/concurrentlinkedhashmap



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