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https://issues.apache.org/jira/browse/SOLR-2180?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12923491#action_12923491
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Yonik Seeley commented on SOLR-2180:
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My reading of it was that it was only on an exception would the request not be
closed (which is still a serious bug though).
I was cranking on tests and overlooked that this change had a broader impact.
> Requests to Embedded Solr (often) leave old Searchers open
> ----------------------------------------------------------
>
> Key: SOLR-2180
> URL: https://issues.apache.org/jira/browse/SOLR-2180
> Project: Solr
> Issue Type: Bug
> Components: search
> Affects Versions: 1.4.2, 1.5, 3.1, 4.0
> Reporter: Lance Norskog
>
> SolrEmbeddedServer.request() fails to call SolrQueryRequest.close() at the
> very end of a successful request. This (in some situations) causes
> EmbeddedSolr to leave old Searchers open until the Solr core stops (core
> unload, the JVM restarts). This leaves old Solr and Lucene caches in place,
> which causes a memory leak.
> A fix for this was committed on the trunk on Sunday, Oct/15/2010.
> [Revision r1023599 to
> SolrEmbeddedServer|http://svn.apache.org/viewvc/lucene/dev/trunk/solr/src/webapp/src/org/apache/solr/client/solrj/embedded/EmbeddedSolrServer.java?diff_format=h&revision=1023599&view=markup]
> This should be backported, or the problem checked for, in 1.4.2 and 3.1.
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