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https://issues.apache.org/jira/browse/SOLR-1513?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Jason Rutherglen updated SOLR-1513:
-----------------------------------

    Attachment: SOLR-1513.patch

The additional parameters, concurencyLevel, softKeys, softValues, may be passed 
as config parameters.  There's a sample solrconfig that needs to be included in 
the test case.  I wasn't sure how TestFastLRUCache is supposed to work.

> Use Google Collections in ConcurrentLRUCache
> --------------------------------------------
>
>                 Key: SOLR-1513
>                 URL: https://issues.apache.org/jira/browse/SOLR-1513
>             Project: Solr
>          Issue Type: Improvement
>          Components: search
>    Affects Versions: 1.4
>            Reporter: Jason Rutherglen
>            Priority: Minor
>             Fix For: 1.5
>
>         Attachments: google-collect-snapshot.jar, SOLR-1513.patch, 
> SOLR-1513.patch
>
>
> ConcurrentHashMap is used in ConcurrentLRUCache.  The Google Colletions 
> concurrent map implementation allows for soft values that are great for 
> caches that potentially exceed the allocated heap.  Though I suppose Solr 
> caches usually don't use too much RAM?
> http://code.google.com/p/google-collections/

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