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https://issues.apache.org/jira/browse/SOLR-6846?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=14556278#comment-14556278
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Yonik Seeley commented on SOLR-6846:
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It's not clear from the description what the problem is.
bq. because cache.wait() is synchronized with the same monitor object.
This is how wait/notify are supposed to work - use the same monitor. The call
to wait() will release the monitor while the thread that called it is blocked.
> deadlock in UninvertedField#getUninvertedField()
> ------------------------------------------------
>
> Key: SOLR-6846
> URL: https://issues.apache.org/jira/browse/SOLR-6846
> Project: Solr
> Issue Type: Bug
> Components: search
> Affects Versions: 4.10.2
> Reporter: Avishai Ish-Shalom
> Fix For: 5.0, Trunk
>
> Attachments: SOLR-6846.patch
>
>
> Multiple concurrent calls to UninvertedField#getUninvertedField may deadlock:
> if a call gets to {{cache.wait()}} before another thread gets to the
> synchronized block around {{cache.notifyAll()}} code will deadlock because
> {{cache.wait()}} is synchronized with the same monitor object.
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