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https://issues.apache.org/jira/browse/LUCENE-4633?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13533324#comment-13533324
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Gilad Barkai commented on LUCENE-4633:
--------------------------------------
+1 patch looks good.
> DirectoryTaxonomyWriter.replaceTaxonomy should refresh the reader
> -----------------------------------------------------------------
>
> Key: LUCENE-4633
> URL: https://issues.apache.org/jira/browse/LUCENE-4633
> Project: Lucene - Core
> Issue Type: Bug
> Components: modules/facet
> Affects Versions: 4.0
> Reporter: Shai Erera
> Assignee: Shai Erera
> Fix For: 4.1, 5.0
>
> Attachments: LUCENE-4633.patch
>
>
> While migrating code to Lucene 4.0 I tripped it. If you call
> replaceTaxonomy() with e.g. a taxonomy index that contains category "a", and
> then you try to add category "a" to the new taxonomy, it receives a new
> ordinal!
> The reason is that replaceTaxo doesn't refresh the internal IndexReader, but
> does clear the cache (as it should). This causes the next addCategory to not
> find category "a" in the cache, and not in the reader instance at hand.
> Simple fix, I'll attach a patch with it and a test exposing the bug.
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