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https://issues.apache.org/jira/browse/SOLR-1513?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12766422#action_12766422
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Shalin Shekhar Mangar commented on SOLR-1513:
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bq. Actually google collections is a 600KB jar and I guess it is good to add it
solr
Google Collections is already checked in as a dependency of Carrot clustering.
> 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
>
>
> 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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