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https://issues.apache.org/jira/browse/SOLR-12233?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16502340#comment-16502340
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ASF subversion and git services commented on SOLR-12233:
--------------------------------------------------------
Commit 0c6f38a315d0df5abd01e7d4efe481bc53444a49 in lucene-solr's branch
refs/heads/master from Jeff
[ https://git-wip-us.apache.org/repos/asf?p=lucene-solr.git;h=0c6f38a ]
SOLR-12233: QParserPlugin's static registry of builtins can be optimized
to avoid needless ClassLoader activity on SolrCore load.
> QParserPlugin maintains a list of classes recreated every time a Solrcore
> object is created
> -------------------------------------------------------------------------------------------
>
> Key: SOLR-12233
> URL: https://issues.apache.org/jira/browse/SOLR-12233
> Project: Solr
> Issue Type: Improvement
> Security Level: Public(Default Security Level. Issues are Public)
> Affects Versions: 7.1.1
> Reporter: Jeff Miller
> Assignee: David Smiley
> Priority: Minor
> Attachments: SOLR-12233.patch
>
> Time Spent: 10m
> Remaining Estimate: 0h
>
> QParserPlugin maintains a static map of Class Names to Class objects and
> everytime we create a SolrCore object this causes a lot of overhead doing
> classloader lookups. Our system runs a lot of cores and the classloader gets
> bogged down when a lot of threads are creating solrcore objects.
> There's no need to create these objects every time, similar classes such as
> TransformerFactory store the object one time and reference it over and over
> again
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