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https://issues.apache.org/jira/browse/LUCENE-3226?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13053248#comment-13053248
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Shai Erera commented on LUCENE-3226:
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We can print "pre-3.1".
But, if somebody opened a 3.0 / 2.x index w/ 3.1+ and all segments were
'touched' by the 3.1+ code, then their version would be "3.0" or "2.x" (i.e.,
not null). So it could be that someone opens two indexes, and CheckIndex
reports "oldVersion=pre-3.1" for one and "oldVersion=2.x" for the other. I
think it's acceptable though.
> rename SegmentInfos.FORMAT_3_1 and improve description in CheckIndex
> --------------------------------------------------------------------
>
> Key: LUCENE-3226
> URL: https://issues.apache.org/jira/browse/LUCENE-3226
> Project: Lucene - Java
> Issue Type: Improvement
> Affects Versions: 3.1, 3.2
> Reporter: Hoss Man
> Fix For: 3.3, 4.0
>
> Attachments: LUCENE-3226.patch
>
>
> A 3.2 user recently asked if something was wrong because CheckIndex was
> reporting his (newly built) index version as...
> {noformat}
> Segments file=segments_or numSegments=1 version=FORMAT_3_1 [Lucene 3.1]
> {noformat}
> It seems like there are two very confusing pieces of information here...
> 1) the variable name of SegmentInfos.FORMAT_3_1 seems like poor choice. All
> other FORMAT_* constants in SegmentInfos are descriptive of the actual change
> made, and not specific to the version when they were introduced.
> 2) whatever the name of the FORMAT_* variable, CheckIndex is labeling it
> "Lucene 3.1", which is missleading since that format is alwasy used in 3.2
> (and probably 3.3, etc...).
> I suggest:
> a) rename FORMAT_3_1 to something like "FORMAT_SEGMENT_RECORDS_VERSION"
> b) change CheckIndex so that the label for the "newest" format always ends
> with " and later" (ie: "Lucene 3.1 and later") so when we release versions
> w/o a format change we don't have to remember to manual list them in
> CheckIndex. when we *do* make format changes and update CheckIndex " and
> later" can be replaced with " to X.Y" and the new format can be added
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