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https://issues.apache.org/jira/browse/LUCENE-1175?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12567880#action_12567880
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Yonik Seeley commented on LUCENE-1175:
--------------------------------------

OK, not much info to reproduce at this point, except to put the iteratons to 
1000000 on testMultiConfig and let it run for a while.  Here is an example 
exception:

{code}
Exception in thread "Lucene Merge Thread #1" 
org.apache.lucene.index.MergePolicy$MergeException: 
java.io.FileNotFoundException: _5_1.del
        at 
org.apache.lucene.index.ConcurrentMergeScheduler.handleMergeException(ConcurrentMergeScheduler.java:320)
        at 
org.apache.lucene.index.ConcurrentMergeScheduler$MergeThread.run(ConcurrentMergeScheduler.java:297)
Caused by: java.io.FileNotFoundException: _5_1.del
        at 
org.apache.lucene.store.RAMDirectory.fileLength(RAMDirectory.java:167)
        at org.apache.lucene.index.SegmentInfo.sizeInBytes(SegmentInfo.java:216)
        at 
org.apache.lucene.index.IndexWriter.mergeMiddle(IndexWriter.java:3750)
        at org.apache.lucene.index.IndexWriter.merge(IndexWriter.java:3354)
        at 
org.apache.lucene.index.ConcurrentMergeScheduler.doMerge(ConcurrentMergeScheduler.java:211)
        at 
org.apache.lucene.index.ConcurrentMergeScheduler$MergeThread.run(ConcurrentMergeScheduler.java:266)
{code}

It could potentially either be a problem in indexing, or in RAMDirectory.


> occasional MergeException while indexing
> ----------------------------------------
>
>                 Key: LUCENE-1175
>                 URL: https://issues.apache.org/jira/browse/LUCENE-1175
>             Project: Lucene - Java
>          Issue Type: Bug
>    Affects Versions: 2.3
>            Reporter: Yonik Seeley
>
> TestStressIndexing2.testMultiConfig occasionally hits merge exceptions

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