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https://issues.apache.org/jira/browse/LUCENE-5492?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13921398#comment-13921398
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Tim Smith commented on LUCENE-5492:
-----------------------------------
to the best of my knowledge, i don't think its something crazy or wrong i'm
doing on my part
still trying to get to the bottom of it
seems to be related to the accounting files in a SegmentInfos not behaving
properly for legacy 3.x segments
> IndexFileDeleter AssertionError in presence of *_upgraded.si files
> ------------------------------------------------------------------
>
> Key: LUCENE-5492
> URL: https://issues.apache.org/jira/browse/LUCENE-5492
> Project: Lucene - Core
> Issue Type: Bug
> Affects Versions: 4.7
> Reporter: Tim Smith
>
> When calling IndexWriter.deleteUnusedFiles against an index that contains 3.x
> segments, i am seeing the following exception:
> {code}
> java.lang.AssertionError: failAndDumpStackJunitStatment: RefCount is 0
> pre-decrement for file "_0_upgraded.si"
> at
> org.apache.lucene.index.IndexFileDeleter$RefCount.DecRef(IndexFileDeleter.java:630)
> at
> org.apache.lucene.index.IndexFileDeleter.decRef(IndexFileDeleter.java:514)
> at
> org.apache.lucene.index.IndexFileDeleter.deleteCommits(IndexFileDeleter.java:286)
> at
> org.apache.lucene.index.IndexFileDeleter.revisitPolicy(IndexFileDeleter.java:393)
> at
> org.apache.lucene.index.IndexWriter.deleteUnusedFiles(IndexWriter.java:4617)
> {code}
> I believe this is caused by IndexFileDeleter not being aware of the Lucene3x
> Segment Infos Format (notably the _upgraded.si files created to "upgrade" an
> old index)
> This is new in 4.7 and did not occur in 4.6.1
> Still trying to track down a workaround/fix
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