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From "Robert Muir (JIRA)" <>
Subject [jira] [Commented] (LUCENE-5850) Constants#LUCENE_MAIN_VERSION can have broken values
Date Mon, 28 Jul 2014 21:49:39 GMT


Robert Muir commented on LUCENE-5850:

But we cannot get the minor version for each segment. So we have to decide if we write the
bugfix version number to index file (x.y.z.a.b.c... as many as you like). If we do this, we
need the validation of LUCENE_MAIN_VERSION (smoker and -> see below).

I think we should: because its the version of lucene that wrote the segment. It is possible
we may need to differentiate 4.8.1 from 4.8 for some hackedy-hack in the future because of
say, a bug unrelated to the format (perhaps in indexwriter or something). So if we write the
correct version we always have the possibility to add workarounds for such things.

> Constants#LUCENE_MAIN_VERSION can have broken values 
> -----------------------------------------------------
>                 Key: LUCENE-5850
>                 URL:
>             Project: Lucene - Core
>          Issue Type: Bug
>          Components: general/build
>    Affects Versions: 4.3.1, 4.5.1
>            Reporter: Simon Willnauer
>             Fix For: 5.0, 4.10
>         Attachments: LUCENE-5850.patch, LUCENE-5850_bomb.patch, LUCENE-5850_smoketester.patch
> Constants#LUCENE_MAIN_VERSION is set to the Lucene Main version and should not contain
minor versions. Well this is at least what I thought and to my knowledge what the comments
say too. Yet in for instance 4.3.1 and 4.5.1 we broke this such that the version from SegmentsInfo
can not be parsed with Version#parseLeniently. IMO we should really add an assertion that
this constant doesn't throw an error and / or make the smoketester catch this. to me this
is actually a index BWC break. Note that 4.8.1 doesn't have this problem...

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