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https://issues.apache.org/jira/browse/SOLR-7836?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=14644312#comment-14644312
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Erick Erickson commented on SOLR-7836:
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OK, the patch doesn't address the real issue. I still think it's bad to leave
those dangling pauseWriters around, but the _real_ issue appears to be over in
DirectUpdateHandler2. There's a ref counted index writer obtained in addDoc0.
But then addDoc0 calls addAndDelete which tries to get a ref counted index
writer again. If another thread sets pauseWriter in between, then it's
deadlocked.
I think the solution is to just pass the IndexWriter down to addAndDelete, but
won't have time to really look until this evening.
> Possible deadlock when closing refcounted index writers.
> --------------------------------------------------------
>
> Key: SOLR-7836
> URL: https://issues.apache.org/jira/browse/SOLR-7836
> Project: Solr
> Issue Type: Bug
> Reporter: Erick Erickson
> Assignee: Erick Erickson
> Attachments: SOLR-7836.patch
>
>
> Preliminary patch for what looks like a possible race condition between
> writerFree and pauseWriter in DefaultSorlCoreState.
> Looking for comments and/or why I'm completely missing the boat.
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