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https://issues.apache.org/jira/browse/LUCENE-8584?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16707076#comment-16707076
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Robert Muir commented on LUCENE-8584:
-------------------------------------
I don't think so. App can pay the cost of going thru the file, keeping refs to
line numbers/content in RAM, and making pretty errors like that.
> Japanese UserDictionary should remove duplicate entries
> -------------------------------------------------------
>
> Key: LUCENE-8584
> URL: https://issues.apache.org/jira/browse/LUCENE-8584
> Project: Lucene - Core
> Issue Type: Improvement
> Reporter: Jim Ferenczi
> Priority: Minor
> Attachments: LUCENE-8584.patch
>
>
> The Japanese's UserDictionary in the kuromoji module fails to load the
> dictionary if the file contains duplicate entries:
> {noformat}
> java.lang.UnsupportedOperationException
> at
> __randomizedtesting.SeedInfo.seed([C340BE6DB5DF33E8:A804576E05DF86DF]:0)
> at org.apache.lucene.util.fst.Outputs.merge(Outputs.java:97)
> at org.apache.lucene.util.fst.Builder.add(Builder.java:445)
> at
> org.apache.lucene.analysis.ja.dict.UserDictionary.<init>(UserDictionary.java:135)
> at
> org.apache.lucene.analysis.ja.dict.UserDictionary.open(UserDictionary.java:81)
> at
> org.apache.lucene.analysis.ja.TestJapaneseTokenizer.readDict(TestJapaneseTokenizer.java:55)
> at
> org.apache.lucene.analysis.ja.dict.UserDictionaryTest.testLookup(UserDictionaryTest.java:30)
> at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
> {noformat}
> Duplicate entries should be ignored or a more descriptive error should be
> thrown.
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