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https://issues.apache.org/jira/browse/LUCENE-3672?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13179083#comment-13179083
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Yonik Seeley commented on LUCENE-3672:
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bq. This bug leads to an unexpected behavior when the only change to be
committed is in userData - we get two commits then that are declared equal,
they have the same version but they have different generation numbers.
Hmmm, why is the version not bumped? That seems like the bug here (the index
changed but the version didn't).
> IndexCommit.equals() bug
> ------------------------
>
> Key: LUCENE-3672
> URL: https://issues.apache.org/jira/browse/LUCENE-3672
> Project: Lucene - Java
> Issue Type: Bug
> Components: core/index
> Affects Versions: 4.0
> Reporter: Andrzej Bialecki
>
> IndexCommit.equals() checks for equality of Directories and versions, but it
> doesn't check IMHO the more important generation numbers. It looks like
> commits are really identified by a combination of directory and segments_XXX,
> which means the generation number, because that's what the
> DirectoryReader.open() checks for.
> This bug leads to an unexpected behavior when the only change to be committed
> is in userData - we get two commits then that are declared equal, they have
> the same version but they have different generation numbers. I have no idea
> how this situation is treated in a few dozen references to
> IndexCommit.equals() across Lucene...
> On the surface the fix is trivial - either add the gen number to equals(), or
> use gen number instead of version. However, it's puzzling why these two would
> ever get out of sync??? and if they are always supposed to be in sync then
> maybe we don't need both of them at all, maybe just generation or version is
> sufficient?
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