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https://issues.apache.org/jira/browse/SOLR-5386?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=17943341#comment-17943341
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ASF subversion and git services commented on SOLR-5386:
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Commit 17510244b214036ad9365019c5053c1711140da8 in solr's branch
refs/heads/main from Chris M. Hostetter
[ https://gitbox.apache.org/repos/asf?p=solr.git;h=17510244b21 ]
SOLR-5386: Fix various methods of invoking "local" solr requests to re-use the
same searcher as the original request.
This notably fixes the use of spellcheck.maxCollationTries in firstSearcher
warming queries to prevent deadlock
> firstSearcher warming can deadlock on queries that use LocalSolrQueryRequest
> internally -- notably spellcheck.maxCollationTries
> -------------------------------------------------------------------------------------------------------------------------------
>
> Key: SOLR-5386
> URL: https://issues.apache.org/jira/browse/SOLR-5386
> Project: Solr
> Issue Type: Bug
> Components: spellchecker
> Affects Versions: 4.4, 4.5
> Reporter: Jeroen Steggink
> Assignee: Chris M. Hostetter
> Priority: Major
> Labels: collate, maxCollationTries, spellcheck
> Attachments: SOLR-5386-1.patch, SOLR-5386.patch,
> Solr5386SpellCheckerHangThreadDump.txt, threaddump.log
>
>
>
> Any Solr search related code that uses {{LocalSolrQueryRequest}} to create a
> "sub request" (notably spellcheck with {{maxCollationTries}}) can cause
> deadlock on core load if it is used in a {{firstSearcher}} warming query,
> because {{LocalSolrQueryRequest}} (via inheritance from
> {{SolrQueryRequestBase}} ) attempts to get the latest registered searcher
> from the {{SolrCore}} -- but this will block until the {{firstSearcher}} is
> registered, creating a deadlock loop.
> {panel:title=Original Bug Report}
> When spellcheck.maxCollationTries is set (>0) Solr hangs in combination with
> that requestHandler set to default="true".
> When I make another requestHandler default, one without the
> maxCollationTries, all requestHandlers work just fine.
> {panel}
>
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