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https://issues.apache.org/jira/browse/SOLR-7803?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Markus Heiden updated SOLR-7803:
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Attachment: TrieField.patch
> Classloading deadlock in TrieField
> ----------------------------------
>
> Key: SOLR-7803
> URL: https://issues.apache.org/jira/browse/SOLR-7803
> Project: Solr
> Issue Type: Bug
> Affects Versions: 5.2.1
> Environment: OSX
> Reporter: Markus Heiden
> Priority: Critical
> Labels: patch
> Attachments: TrieField.patch
>
>
> When starting a Solr our instance lock up sometimes. We took a thread dump
> and all thread are trying to load classes via Class.forName() and are stuck
> in that method. One of these the threads got one step further into the
> <clinit> of TrieField where it creates an internal static instance of
> TrieDateField (circular dependency). I don't know why this locks up exactly,
> but this code smells anyway. So I removed that instance and made the used
> methods static.
> This does not completely remove the circular dependency, but at least it is
> no more in <clinit>. For the future someone may extract a util class to
> remove the circular dependency.
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