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https://issues.apache.org/jira/browse/LUCENE-7891?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16068244#comment-16068244
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Jan-Willem van den Broek commented on LUCENE-7891:
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As discussed on the mailing list:
http://mail-archives.apache.org/mod_mbox/lucene-dev/201706.mbox/%3CCAPz8bx0%3Dtg_DnPCdjFoVi1R8x-PaEv2TffdGudvLvjVz%2BCJgKw%40mail.gmail.com%3E
> Default LRUType of LruTaxonomyWriterCache should be guaranteed to be correct
> ----------------------------------------------------------------------------
>
> Key: LUCENE-7891
> URL: https://issues.apache.org/jira/browse/LUCENE-7891
> Project: Lucene - Core
> Issue Type: Improvement
> Components: core/other
> Affects Versions: 6.4, 6.5, 6.4.1, 6.4.2, 6.6, 6.5.1
> Reporter: Jan-Willem van den Broek
> Attachments: LUCENE-7891.patch
>
>
> LruTaxonomyWriterCache uses LRUType.LRU_HASHED by default. This has a very
> small but non-zero chance of producing incorrect results due to collisions in
> the longHashCode of FacetLabel. If such a collision occurs, then an affected
> document will get an incorrect facet.
> This has happened to us in production. While it is a rare occurrence, the
> consequences could be significant, and it was not immediately obvious what
> caused the problem. Therefore I think it is better if the default is changed
> to LRUType.LRU_STRING, which is guaranteed to be correct.
> I will add a patch containing this change as well as a test for the issue.
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