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https://issues.apache.org/jira/browse/SOLR-13817?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16967788#comment-16967788
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Ben Manes commented on SOLR-13817:
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I was curiousing looking through
[LruQueryCache|https://github.com/apache/lucene-solr/commits/master/lucene/core/src/java/org/apache/lucene/search/LRUQueryCache.java]
which has a lot of JIRAs to deal with performance. There are a lot of tweaks
to degrade cache efficiency to compensate for lock contention.
- It doesn't handle the cache stampedes
- It queries the entry to see if it's even worth caching, so that cheaper
entries don't bang on the lock
- The cache lookup is skipped if the global lock is held and the value
computed, but not stored, which means a busy lock reduces performance across
all usages.
Would you be open to a new JIRA to investigate whether Caffeine would be a
better internal implementation?
> Deprecate legacy SolrCache implementations
> ------------------------------------------
>
> Key: SOLR-13817
> URL: https://issues.apache.org/jira/browse/SOLR-13817
> Project: Solr
> Issue Type: Improvement
> Security Level: Public(Default Security Level. Issues are Public)
> Reporter: Andrzej Bialecki
> Assignee: Andrzej Bialecki
> Priority: Major
>
> Now that SOLR-8241 has been committed I propose to deprecate other cache
> implementations in 8x and remove them altogether from 9.0, in order to reduce
> confusion and maintenance costs.
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