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https://issues.apache.org/jira/browse/SOLR-667?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Yonik Seeley updated SOLR-667:
------------------------------

    Attachment: SOLR-667-updates.patch

Some minor updates:
 - fix thread saftey issue in finalizer (background thread may never see stop 
being set)
 - fix tracking of size in put() to only increment if oldValue != null
 - optimize cleaning check in put() since it will be called for every put until 
the size is back down.


> 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
>            Assignee: Shalin Shekhar Mangar
>             Fix For: 1.4
>
>         Attachments: ConcurrentLRUCache.java, ConcurrentLRUCache.java, 
> ConcurrentLRUCache.java, SOLR-667-updates.patch, SOLR-667.patch, 
> SOLR-667.patch, SOLR-667.patch, 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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