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https://issues.apache.org/jira/browse/LUCENE-5934?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=14128469#comment-14128469
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Michael McCandless commented on LUCENE-5934:
--------------------------------------------
I built a 4.0.0 index and copied forward to 4.x's TestBackwardsCompatibility,
and the test fails with this:
{noformat}
java.io.IOException: file _0.si already exists
at
__randomizedtesting.SeedInfo.seed([DC4E59ED2DE3E60F:6D2FC24DAADD029A]:0)
at
org.apache.lucene.store.MockDirectoryWrapper.createOutput(MockDirectoryWrapper.java:552)
at
org.apache.lucene.index.SegmentInfos.write3xInfo(SegmentInfos.java:610)
at org.apache.lucene.index.SegmentInfos.write(SegmentInfos.java:535)
at
org.apache.lucene.index.SegmentInfos.prepareCommit(SegmentInfos.java:1033)
at
org.apache.lucene.index.IndexWriter.startCommit(IndexWriter.java:4560)
at
org.apache.lucene.index.IndexWriter.prepareCommitInternal(IndexWriter.java:3067)
at
org.apache.lucene.index.IndexWriter.commitInternal(IndexWriter.java:3174)
at org.apache.lucene.index.IndexWriter.shutdown(IndexWriter.java:916)
at org.apache.lucene.index.IndexWriter.close(IndexWriter.java:987)
at org.apache.lucene.index.IndexWriter.close(IndexWriter.java:957)
{noformat}
It's slightly different than what Ian saw because MDW catches earlier that
something is wrong since we are supposed to be write-once.
But without MDW, we would create the output (overwriting the correct one from
the index), then inside a try/finally we throw that IllegalStateExc, then in
the finally clause we close that .si file and delete it. So I suspect exactly
one .si file is deleted from Ian's index, causing the corruption.
bq. Can we move it before we do anything destructive for additional safety?
We should definitely move up this check, after adding the missing indices to
TestBackCompat.
> 4.10 broke backwards compatibility for 4.0 indexes
> --------------------------------------------------
>
> Key: LUCENE-5934
> URL: https://issues.apache.org/jira/browse/LUCENE-5934
> Project: Lucene - Core
> Issue Type: Bug
> Components: core/codecs, core/index
> Affects Versions: 4.10
> Reporter: Robert Muir
> Priority: Blocker
> Fix For: 4.10.1, 4.11, 5.0
>
> Attachments: LUCENE-5934.patch
>
>
> As reported by Ian on the user list:
> Its trying to treat them as 3.x
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