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https://issues.apache.org/jira/browse/SOLR-12155?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16438877#comment-16438877
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Andrey Kudryavtsev commented on SOLR-12155:
-------------------------------------------

Request object is not thread safe I guess. Try 
{code:java}
final SolrQueryRequest req = req("*:*");
final SolrIndexSearcher solrIndexSearcher = req.getSearcher();
.....

initCallables.add(()-> UnInvertedField.getUnInvertedField(proto.field(), 
solrIndexSearcher));

.....{code}

> Solr 7.2.1 deadlock in UnInvertedField.getUnInvertedField() 
> ------------------------------------------------------------
>
>                 Key: SOLR-12155
>                 URL: https://issues.apache.org/jira/browse/SOLR-12155
>             Project: Solr
>          Issue Type: Bug
>      Security Level: Public(Default Security Level. Issues are Public) 
>    Affects Versions: 7.2.1
>            Reporter: Kishor gandham
>            Assignee: Mikhail Khludnev
>            Priority: Major
>             Fix For: 7.4, master (8.0)
>
>         Attachments: 21832-consoleText.txt.zip, SOLR-12155.patch, 
> SOLR-12155.patch, SOLR-12155.patch, SOLR-12155.patch, SOLR-12155.patch, 
> stack.txt
>
>
> I am attaching a stack trace from our production Solr (7.2.1). Occasionally, 
> we are seeing SOLR becoming unresponsive. We are then forced to kill the JVM 
> and start solr again.
> We have a lot of facet queries and our index has approximately 15 million 
> documents. We have recently started using json.facet queries and some of the 
> facet fields use DocValues.



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