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https://issues.apache.org/jira/browse/SOLR-667?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12635221#action_12635221
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Fuad Efendi commented on SOLR-667:
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Paul, Yonik, thanks for your efforts; BTW 'Concurrent'HashMap uses spinloops
for 'safe' updates in order to avoid synchronization (instead of giving up CPU
cycles); there are always cases when it is not faster that simple HashMap with
synchronization.
LingPipe uses different approach, see last comment at SOLR-665.
Also, why are you in-a-loop with LRU? LFU is logically better.
+1 and thanks for sharing.
> 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
> Fix For: 1.4
>
> Attachments: ConcurrentLRUCache.java, ConcurrentLRUCache.java,
> ConcurrentLRUCache.java, SOLR-667.patch, SOLR-667.patch, SOLR-667.patch,
> SOLR-667.patch
>
>
> 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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