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https://issues.apache.org/jira/browse/LUCENE-3601?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13157990#comment-13157990
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Michael McCandless commented on LUCENE-3601:
--------------------------------------------
That exception is due to a real (latent) bug!
IW.addIndexes(Dir[]) just copies files over, converting them to 4.0 style CFS
(_X.cfe and _X.cfs files), if necessary. But the original SI for the added
segment has "version" still set to 3.1, so when SI.files() is called it thinks
this segment does not have an _X.cfe file and so that file gets (incorrectly,
leading to corruption) removed.
Not quite sure how to fix this...
> testIWondiskfull unreferenced files failure
> -------------------------------------------
>
> Key: LUCENE-3601
> URL: https://issues.apache.org/jira/browse/LUCENE-3601
> Project: Lucene - Java
> Issue Type: Bug
> Reporter: Robert Muir
> Attachments: LUCENE-3601.patch
>
>
> NOTE: reproduce with: ant test -Dtestcase=TestIndexWriterOnDiskFull
> -Dtestmethod=testAddDocumentOnDiskFull
> -Dtests.seed=aff9b14dd518cfb:4d2f112726e2947f:-2b03094a43a947ee
> -Dtests.multiplier=3 -Dargs="-Dfile.encoding=ISO8859-1"
> Reproduces some of the time...
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