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https://issues.apache.org/jira/browse/LUCENENET-135?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12615034#action_12615034
 ] 

Digy commented on LUCENENET-135:
--------------------------------

Same bug also exists in ConcurrentMergeScheduler(Sync) which causes 
TestAddIndexOnDiskFull

{code}

public virtual void  Sync()
{
        lock (this) //<-------
        {
                while (MergeThreadCount() > 0)
                {
                        Message("now wait for threads; currently " + 
mergeThreads.Count + " still running");
                        int count = mergeThreads.Count;
                        for (int i = 0; i < count; i++)
                                Message("    " + i + ": " + ((MergeThread) 
mergeThreads[i]));
                                
                        try
                        {
                                System.Threading.Monitor.Wait(this); //<-------
                        }
                        catch (System.Threading.ThreadInterruptedException)
                        {
                        }
                }
        }
}
{code}

> Race condition in DocumentsWriter.UpdateDocument
> ------------------------------------------------
>
>                 Key: LUCENENET-135
>                 URL: https://issues.apache.org/jira/browse/LUCENENET-135
>             Project: Lucene.Net
>          Issue Type: Bug
>         Environment: 2.3.1
>            Reporter: Digy
>         Attachments: DocumentsWriter-Temp.patch
>
>
> There is a race condition in DocumentsWriter.UpdateDocument. Locking the 
> whole method solves the problem but this is not what  is intended in java 
> version
> (testcase:  Index/TestIndexWriter/TestDocumentsWriterExceptionThreads)
> I am working on it.
> DIGY

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