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https://issues.apache.org/jira/browse/LUCENE-3607?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13158760#comment-13158760
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Michael McCandless commented on LUCENE-3607:
--------------------------------------------
This hasn't yet been fixed... when Lucene makes a new index, it sets the
"version" field in SegmentInfos to System.currentTimeMillis().
The comment says this:
{noformat}
/**
* counts how often the index has been changed by adding or deleting docs.
* starting with the current time in milliseconds forces to create unique
version numbers.
*/
{noformat}
But... I don't see why we need unique version numbers across different indices.
I don't think we advertise (nor, should) that the version number you get out
of IR is comparable across indices created anew... so I think we can change
this to set initial version to 0 instead.
> Lucene Index files can not be reproduced faithfully (due to timestamps
> embedded)
> --------------------------------------------------------------------------------
>
> Key: LUCENE-3607
> URL: https://issues.apache.org/jira/browse/LUCENE-3607
> Project: Lucene - Java
> Issue Type: Bug
> Components: core/index
> Affects Versions: 2.9.1
> Environment: Eclipse 3.7
> Reporter: Martin Oberhuber
>
> Eclipse 3.7 uses Lucene 2.9.1 for indexing online help content. A
> pre-generated help index can be shipped together with online content. As per
> [[https://bugs.eclipse.org/bugs/show_bug.cgi?id=364979 ]]
> it turns out that the help index can not be faithfully reproduced during a
> build, because there are timestamps embedded in the index files, and the
> "NameCounter" field in segments_2 contains different contents on every build.
> Not being able to faithfully reproduce the index from identical source bits
> undermines trust in the index (and software delivery) being correct.
> I'm wondering whether this is a known issue and/or has been addressed in a
> newer Lucene version already ?
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