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https://issues.apache.org/jira/browse/LUCENE-4455?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13466992#comment-13466992
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Uwe Schindler commented on LUCENE-4455:
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Thanks for fixing!
> CheckIndex shows wrong segment size in 4.0 because
> SegmentInfoPerCommit.sizeInBytes counts every file 2 times; check for
> deletions is negated and results in wrong output
> -------------------------------------------------------------------------------------------------------------------------------------------------------------------------
>
> Key: LUCENE-4455
> URL: https://issues.apache.org/jira/browse/LUCENE-4455
> Project: Lucene - Core
> Issue Type: Bug
> Components: core/index
> Affects Versions: 4.0-BETA
> Reporter: Uwe Schindler
> Assignee: Michael McCandless
> Priority: Blocker
> Fix For: 4.0
>
> Attachments: LUCENE-4455.patch
>
>
> I found this bug in 4.0-RC1 when I compared the checkindex outputs for 4.0
> and 3.6.1:
> - The segment size is twice as big as reported by "ls -lh". The reason is
> that SegmentInfoPerCommit.sizeInBytes counts every file 2 times. This seems
> to be not so serious (it is just statistics), *but*: MergePolicy chooses
> merges because of this. On the other hand if all segments are twice as big it
> should not affect merging behaviour (unless absolute sizes in megabytes are
> used). So we should really fix this - sorry for investigating this so late!
> - The deletions in the segments are inverted. Segments that have no
> deleteions are reported as those *with deletions* but delGen=-1, and those
> with deletions show "no deletions", this is not serious, but should be fixed,
> too.
> There is one "bug" in sizeInBytes (which we should NOT fix), is that for 3.x
> indexes, if they are from 3.0 and have shared doc stores they are
> overestimated. But that's fine. For this case, the index was a 3.6.1 segment
> and a 4.0 segment, both showed double size.
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