[jira] [Created] (SOLR-7803) Classloading deadlock in TrieField

["Markus Heiden (JIRA)" <ji...@apache.org>]

Markus Heiden created SOLR-7803:
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             Summary: 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


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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