Jan-Willem van den Broek created LUCENE-7891:
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Summary: 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: 6.5.1, 6.6, 6.4.2, 6.4.1, 6.5, 6.4
Reporter: Jan-Willem van den Broek
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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