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https://issues.apache.org/jira/browse/SOLR-9116?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15337037#comment-15337037
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ASF subversion and git services commented on SOLR-9116:
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Commit e86eb9d1ecd6f63b15068b368819e31c4c3e1203 in lucene-solr's branch
refs/heads/branch_5_5 from [~shalinmangar]
[ https://git-wip-us.apache.org/repos/asf?p=lucene-solr.git;h=e86eb9d ]
SOLR-9116: Race condition causing occasional SolrIndexSearcher leak when
SolrCore is reloaded
(cherry picked from commit d6a5c5a)
> Race condition causing occasional SolrIndexSearcher leak when SolrCore is
> reloaded
> ----------------------------------------------------------------------------------
>
> Key: SOLR-9116
> URL: https://issues.apache.org/jira/browse/SOLR-9116
> Project: Solr
> Issue Type: Bug
> Reporter: Jessica Cheng Mallet
> Assignee: Shalin Shekhar Mangar
> Labels: leak, searcher
> Fix For: 5.6, 6.0.1, 6.1, 5.5.2, master (7.0)
>
> Attachments: SOLR-9116.patch
>
>
> Fix a leak of SolrIndexSearcher when a SolrCore is reloaded. Added a test to
> expose this leak when run in many iterations (pretty reliable failure with
> iters=1K), which passes with the fix (ran iters=10K twice).
> The fundamental issue is that when an invocation of SolrCore#openNewSearcher
> is racing with SolrCore#close, if this synchronized block
> (https://github.com/apache/lucene-solr/blob/master/solr/core/src/java/org/apache/solr/core/SolrCore.java#L1611)
> in openNewSearcher doesn't check for whether or not the core is closed, it
> can possibly run after the core runs closeSearcher and assign the newly
> constructed searcher to realtimeSearcher again, which will never be cleaned
> up. The fix is to check if the SolrCore is closed inside the synchronized
> block, and if so, clean up the newly constructed searcher and throw an
> Exception.
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