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https://issues.apache.org/jira/browse/SOLR-647?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12617435#action_12617435
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Yonik Seeley commented on SOLR-647:
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I took a quick peek.... looks like there are probably race conditions.
A core could be obtained in thread A, then decRef() could be called in thread B
that triggers a real close, then incRef() would be called in thread A (oops).
> Do SolrCore.close() in a refcounted way
> ---------------------------------------
>
> Key: SOLR-647
> URL: https://issues.apache.org/jira/browse/SOLR-647
> Project: Solr
> Issue Type: Improvement
> Affects Versions: 1.3
> Reporter: Noble Paul
> Priority: Minor
> Attachments: SOLR-647.patch
>
>
> The method _SolrCore.close()_ directly closes the core . It can cause
> Exceptions for in-flight requests. The _close()_ method should just do a
> decrement on refcount and the actual close must happen when the last request
> being processed by that core instance is completed
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