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https://issues.apache.org/jira/browse/LUCENE-1232?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12578904#action_12578904
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Yonik Seeley commented on LUCENE-1232:
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A nice thing about version is that it has relatively high uniqueness.
If we use generation for version, one could blow away an index, rebuild it with
slight changes, and get the same version number.... so version becomes less
useful.
> Use segments generation instead of version
> ------------------------------------------
>
> Key: LUCENE-1232
> URL: https://issues.apache.org/jira/browse/LUCENE-1232
> Project: Lucene - Java
> Issue Type: Improvement
> Components: Index
> Affects Versions: 2.1, 2.2, 2.3, 2.3.1
> Reporter: Michael McCandless
> Assignee: Michael McCandless
> Priority: Minor
> Fix For: 2.4
>
> Attachments: check.version.vs.gen.diff, LUCENE-1232.dc.patch,
> LUCENE-1232.patch
>
>
> Right now the segments file stores generation, a long starting with 0
> that increments by 1 with each commit, and version, a long starting
> with System.currentTimeMillis() that also increments by 1 with each
> commit.
> I think they are redundant so we can replace all methods/uses of
> version with generation instead.
> Spinoff from LUCENE-1228.
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