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From "Ben Manes (JIRA)" <>
Subject [jira] [Updated] (SOLR-7355) Java 8: ConcurrentLinkedHashMap -> Caffeine
Date Tue, 07 Apr 2015 23:02:12 GMT


Ben Manes updated SOLR-7355:
    Attachment:     (was: SOLR-7355.patch)

> Java 8: ConcurrentLinkedHashMap -> Caffeine
> -------------------------------------------
>                 Key: SOLR-7355
>                 URL:
>             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:
> Benchmarks:
> ConcurrentLinkedHashMap:

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