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https://issues.apache.org/jira/browse/LUCENE-6213?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=14518485#comment-14518485
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Hoss Man commented on LUCENE-6213:
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bq. Eg. For M.0.0, expect a test index "(M)x-with-(M-1)x-segments". I think
this is essentially what you were saying?
My point was that for a sanity check like this, where the focus is on major
versions, we can go even farther then just looking at the list of existing
releases.
In your example, i think that even if there is no official "M" release, the
smoketester for "M+1" should fail if a test for "(M)x-with-(M-1)x-segments can
not be found.
Example: if the trunk version property is set to "8.Y" (where the value of Y is
irrelevant) then it should be expected that the a "7x-with-6x-segments" index
is tested -- even if there is no 7.X release yet according to jira /
archive.apache.org.
that way, in the first few days after a "7x_branch" is created, and trunk's
version property is updated to "8.0" it will be clear from the smokeTester
failures on trunk that trunk is not in a state suitable to be released -- by
definittion trunk won't be suitable for release until a 7.0 release is final
and the 7x index format is used to create the "7x-with-6x-segments" index for
the trunk test.
> Add test for IndexFormatTooOldException if a commit has a 3.x segment
> ---------------------------------------------------------------------
>
> Key: LUCENE-6213
> URL: https://issues.apache.org/jira/browse/LUCENE-6213
> Project: Lucene - Core
> Issue Type: Bug
> Reporter: Robert Muir
> Assignee: Ryan Ernst
> Attachments: LUCENE-6213.patch, LUCENE-6213.patch, LUCENE-6213.patch,
> unsupported.4x-with-3x-segments.zip
>
>
> We should add a 4.x index (4.x commit) with some 3.x segment(s) to our
> backwards tests.
> I don't think we throw IndexFormatTooOldException correctly in this case. I
> think instead the user will get a confusing SPI error about a missing codec
> "Lucene3x".
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