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From "Robert Muir (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (LUCENE-4084) unable to generate a 4.x back compat test index
Date Tue, 29 May 2012 17:28:23 GMT

    [ https://issues.apache.org/jira/browse/LUCENE-4084?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13284948#comment-13284948
] 

Robert Muir commented on LUCENE-4084:
-------------------------------------

{noformat}
  [junit4] ERROR   0.23s | TestBackwardsCompatibility.testCreateCFS
   [junit4]    > Throwable #1: org.apache.lucene.util.SetOnce$AlreadySetException: The
object cannot be set twice!
   [junit4]    > 	at __randomizedtesting.SeedInfo.seed([2ADDAAF27DE7C63D:38D013F5650FDD60]:0)
   [junit4]    > 	at org.apache.lucene.util.SetOnce.set(SetOnce.java:69)
   [junit4]    > 	at org.apache.lucene.index.DocumentsWriterPerThreadPool.initialize(DocumentsWriterPerThreadPool.java:139)
   [junit4]    > 	at org.apache.lucene.index.DocumentsWriter.<init>(DocumentsWriter.java:145)
   [junit4]    > 	at org.apache.lucene.index.IndexWriter.<init>(IndexWriter.java:668)
   [junit4]    > 	at org.apache.lucene.index.TestBackwardsCompatibility.createIndex(TestBackwardsCompatibility.java:464)
   [junit4]    > 	at org.apache.lucene.index.TestBackwardsCompatibility.testCreateCFS(TestBackwardsCompatibility.java:78)
{noformat}
                
> unable to generate a 4.x back compat test index
> -----------------------------------------------
>
>                 Key: LUCENE-4084
>                 URL: https://issues.apache.org/jira/browse/LUCENE-4084
>             Project: Lucene - Java
>          Issue Type: Bug
>          Components: core/index
>            Reporter: Robert Muir
>             Fix For: 4.0
>
>
> It seems the issue is an IWC cannot be used across 2 different indexwriters, because
the DWPTThreadPool is created on the IndexWriterConfig, and you hit a SetOnce exception...
seems like the exception is correct and it would be bad to have two indexwriters sharing the
same DWPTThreadPool?
> stacktrace to follow in a comment.

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