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From "Robert Muir (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (LUCENE-5850) Constants#LUCENE_MAIN_VERSION can have broken values
Date Wed, 30 Jul 2014 16:04:39 GMT

    [ https://issues.apache.org/jira/browse/LUCENE-5850?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=14079419#comment-14079419
] 

Robert Muir commented on LUCENE-5850:
-------------------------------------

Right, to be clear, here we have calmed the symptoms (the back compat time-bomb bugs in SegmentReader
and codec).
But to me this isn't enough, i am afraid of what would happen if we released such code in
a bugfix release.
We need to cure the disease, and prevent such bugs from being easy to do.

Additionally we should probably change the release instructions to generate back compat index
for *every release*  bugfix or not, index format change or not, and retroactively generate
them for all 4.x releases. This would provide additional protection.

> Constants#LUCENE_MAIN_VERSION can have broken values 
> -----------------------------------------------------
>
>                 Key: LUCENE-5850
>                 URL: https://issues.apache.org/jira/browse/LUCENE-5850
>             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.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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