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Posted to dev@lucenenet.apache.org by GitBox <gi...@apache.org> on 2020/07/30 16:24:30 UTC

[GitHub] [lucenenet] mlaufer commented on issue #296: IndexOutOfRangeException when searching

mlaufer commented on issue #296:
URL: https://github.com/apache/lucenenet/issues/296#issuecomment-666504940


   Hi @NightOwl888,
   
   I can basically confirm the behavior described here when using FuzzyQuery, most of the times it works, but sometimes searches fail with a pretty similar exception tho: 
   
   `System.IndexOutOfRangeException: Index was outside the bounds of the array.
      at Lucene.Net.Util.Automaton.UTF32ToUTF8.Convert(Automaton utf32)
      at Lucene.Net.Util.Automaton.CompiledAutomaton..ctor(Automaton automaton, Nullable`1 finite, Boolean simplify)
      at Lucene.Net.Search.FuzzyTermsEnum.InitAutomata(Int32 maxDistance)
      at Lucene.Net.Search.FuzzyTermsEnum.GetAutomatonEnum(Int32 editDistance, BytesRef lastTerm)
      at Lucene.Net.Search.FuzzyTermsEnum.MaxEditDistanceChanged(BytesRef lastTerm, Int32 maxEdits, Boolean init)
      at Lucene.Net.Search.FuzzyTermsEnum..ctor(Terms terms, AttributeSource atts, Term term, Single minSimilarity, Int32 prefixLength, Boolean transpositions)
      at Lucene.Net.Search.FuzzyQuery.GetTermsEnum(Terms terms, AttributeSource atts)
      at Lucene.Net.Search.TermCollectingRewrite`1.CollectTerms(IndexReader reader, MultiTermQuery query, TermCollector collector)
      at Lucene.Net.Search.TopTermsRewrite`1.Rewrite(IndexReader reader, MultiTermQuery query)
      at Lucene.Net.Search.BooleanQuery.Rewrite(IndexReader reader)
      at Lucene.Net.Search.BooleanQuery.Rewrite(IndexReader reader)
      at Lucene.Net.Search.BooleanQuery.Rewrite(IndexReader reader)
      at Lucene.Net.Search.IndexSearcher.Rewrite(Query original)
      at Lucene.Net.Search.IndexSearcher.CreateNormalizedWeight(Query query)
      at Lucene.Net.Search.IndexSearcher.Search(Query query, Int32 n, Sort sort)`
   
   We are using Lucene 4.8. For now, we are "solving" this by using a try catch around the Search() and catch it to do retry of the search, which greatly reduces the amount of failed searches.


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