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https://issues.apache.org/jira/browse/SOLR-667?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12618750#action_12618750
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Fuad Efendi commented on SOLR-667:
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bq. ...safety, where nothing bad ever happens to an object.
When _SOLR_ adds object to cache or remove it from cache it does not change it,
it manipulates with internal arrays of pointers to objects (which are probably
atomic, but I don't know such JVM & GC internals in-depth...)
Looks heavy with TreeSet...
> Alternate LRUCache implementation
> ---------------------------------
>
> Key: SOLR-667
> URL: https://issues.apache.org/jira/browse/SOLR-667
> Project: Solr
> Issue Type: New Feature
> Components: search
> Affects Versions: 1.3
> Reporter: Noble Paul
> Attachments: ConcurrentLRUCache.java
>
>
> The only available SolrCache i.e LRUCache is based on _LinkedHashMap_ which
> has _get()_ also synchronized. This can cause severe bottlenecks for faceted
> search. Any alternate implementation which can be faster/better must be
> considered.
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