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https://issues.apache.org/jira/browse/SOLR-14576?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=17142500#comment-17142500
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Noble Paul commented on SOLR-14576:
-----------------------------------

This was reported by a client and unfortunately I do not have the heap dump.

> HttpCacheHeaderUti.etagCoreCache should not use a SolrCore as key
> -----------------------------------------------------------------
>
>                 Key: SOLR-14576
>                 URL: https://issues.apache.org/jira/browse/SOLR-14576
>             Project: Solr
>          Issue Type: Bug
>      Security Level: Public(Default Security Level. Issues are Public) 
>            Reporter: Noble Paul
>            Priority: Minor
>          Time Spent: 10m
>  Remaining Estimate: 0h
>
> GC performance is affected when the key is a complex data structure. We can 
> make it
> {code}
> private static WeakIdentityMap<String, EtagCacheVal> etagCoreCache = 
> WeakIdentityMap.newConcurrentHashMap();
> {code}
> instead of
>  {code}
> private static WeakIdentityMap<SolrCore, EtagCacheVal> etagCoreCache = 
> WeakIdentityMap.newConcurrentHashMap();
> {code}
>  



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