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https://issues.apache.org/jira/browse/LUCENE-10482?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=17523464#comment-17523464
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Gautam Worah commented on LUCENE-10482:
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Got it. My apologies for introducing this error. I had switched to using
Instant.now() during testing because when the single test case was failing
midway it was not able to delete the temporary folder. Subsequent runs of the
test would fail because a folder with the particular name was already existing.
Submitting a fix right now
> Allow users to create their own DirectoryTaxonomyReaders with empty
> taxoArrays instead of letting the taxoEpoch decide
> ----------------------------------------------------------------------------------------------------------------------
>
> Key: LUCENE-10482
> URL: https://issues.apache.org/jira/browse/LUCENE-10482
> Project: Lucene - Core
> Issue Type: Improvement
> Components: modules/facet
> Affects Versions: 9.1
> Reporter: Gautam Worah
> Priority: Minor
> Time Spent: 6h 50m
> Remaining Estimate: 0h
>
> I was experimenting with the taxonomy index and {{DirectoryTaxonomyReaders}}
> in my day job where we were trying to replace the index underneath a reader
> asynchronously and then call the {{doOpenIfChanged}} call on it.
> It turns out that the taxonomy index uses its own index based counter (the
> {{{}taxonomyIndexEpoch{}}}) to determine if the index was opened in write
> mode after the last time it was written and if not, it directly tries to
> reuse the previous {{taxoArrays}} it had created. This logic fails in a
> scenario where both the old and new index were opened just once but the index
> itself is completely different in both the cases.
> In such a case, it would be good to give the user the flexibility to inform
> the DTR to recreate its {{{}taxoArrays{}}}, {{ordinalCache}} and
> {{{}categoryCache{}}} (not refreshing these arrays causes it to fail in
> various ways). Luckily, such a constructor already exists! But it is private
> today! The idea here is to allow subclasses of DTR to use this constructor.
> Curious to see what other folks think about this idea.
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