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https://issues.apache.org/jira/browse/LUCENE-10228?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Julie Tibshirani resolved LUCENE-10228.
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Fix Version/s: 9.1
9.0
Resolution: Fixed
> PerFieldKnnVectorsFormat can write to wrong format name
> -------------------------------------------------------
>
> Key: LUCENE-10228
> URL: https://issues.apache.org/jira/browse/LUCENE-10228
> Project: Lucene - Core
> Issue Type: Bug
> Reporter: Julie Tibshirani
> Priority: Major
> Fix For: 9.1, 9.0
>
> Time Spent: 50m
> Remaining Estimate: 0h
>
> Currently when creating a KnnVectorsWriter for merging, we consult the
> existing "PER_FIELD_SUFFIX_KEY" attribute to determine the format's per-field
> suffix. This isn't correct since we could be using a new codec (that produces
> different formats/ suffixes).
> The attached PR modifies TestPerFieldDocValuesFormat#testMergeUsesNewFormat
> to trigger the problem. Without the fix we get an error like
> "java.nio.file.FileAlreadyExistsException: File
> "_3_Lucene90HnswVectorsFormat_0.vem" was already written to."
>
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