Ethan Tao created SOLR-3484:
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             Summary: LogUpdateProcessor throws ConcurrentModificationException 
under multi-threading calls 
                 Key: SOLR-3484
                 URL: https://issues.apache.org/jira/browse/SOLR-3484
             Project: Solr
          Issue Type: Bug
          Components: update
    Affects Versions: 4.0
         Environment: linux
            Reporter: Ethan Tao


Using the LogUpdateProcessor in a singleton chain for concurrent processing 
throws exception. The issue has been reported in SOLR-2694 (closed), and an 
unoffical patch can be found in related bug-id SOLR-2804 patch dated 1/1/12.

If the patch won't become official for LogUpdateProcessor, suggested to have 
new class "ConcurrentLogUpdateProcessorFactory" to address the thread safe 
issue.

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