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https://issues.apache.org/jira/browse/SOLR-7355?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=14484418#comment-14484418
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Ben Manes commented on SOLR-7355:
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* License remains Apache 2.
* Performance should be the same or higher.
* A grep for Google's shows it being used primarily for memoization.
* Solr appears to use many different caching implementations so its hard, as an
outsider, to discern which are performance critical.
> 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
> Attachments: SOLR-7355.patch
>
>
> 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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