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https://issues.apache.org/jira/browse/SOLR-7355?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=14485891#comment-14485891
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Erick Erickson commented on SOLR-7355:
--------------------------------------
Uwe:
I usually see eol-style errors during precommit when I'm applying
_other_ people's patches. Thanks for the tip though, I'll use it on my
patches...
> Java 8: ConcurrentLinkedHashMap -> Caffeine
> -------------------------------------------
>
> Key: SOLR-7355
> URL: https://issues.apache.org/jira/browse/SOLR-7355
> Project: Solr
> Issue Type: Task
> Reporter: Ben Manes
> Assignee: Shawn Heisey
> Priority: Minor
> Fix For: Trunk
>
> Attachments: SOLR-7355.patch, SOLR-7355.patch, SOLR-7355.patch,
> 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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