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