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From "Uwe Schindler (JIRA)" <j...@apache.org>
Subject [jira] Commented: (LUCENE-2142) FieldCache.getStringIndex should not throw exception if term count exceeds doc count
Date Thu, 24 Jun 2010 10:42:52 GMT

    [ https://issues.apache.org/jira/browse/LUCENE-2142?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12882119#action_12882119
] 

Uwe Schindler commented on LUCENE-2142:
---------------------------------------

Committed in trunk, 3x, 3.0, 2.9 branches.

Trunk is still missing the escape-branch when term count exceeds doc count.

> FieldCache.getStringIndex should not throw exception if term count exceeds doc count
> ------------------------------------------------------------------------------------
>
>                 Key: LUCENE-2142
>                 URL: https://issues.apache.org/jira/browse/LUCENE-2142
>             Project: Lucene - Java
>          Issue Type: Bug
>          Components: Search
>            Reporter: Michael McCandless
>            Assignee: Michael McCandless
>            Priority: Minor
>             Fix For: 2.9.4, 3.0.3, 3.1, 4.0
>
>         Attachments: LUCENE-2142-fix-3x.patch, LUCENE-2142-fix-trunk.patch
>
>
> Spinoff of LUCENE-2133/LUCENE-831.
> Currently FieldCache cannot handle more than one value per field.
> We may someday want to fix that... but until that day:
> FieldCache.getStringIndex currently does a simplistic check to try to
> catch when you've accidentally allowed more than one term per field,
> by testing if the number of unique terms exceeds the number of
> documents.
> The problem is, this is not a perfect check, in that it allows false
> negatives (you could have more than one term per field for some docs
> and the check won't catch you).
> Further, the exception thrown is the unchecked RuntimeException.
> So this means... you could happily think all is good, until some day,
> well into production, once you've updated enough docs, suddenly the
> check will catch you and throw an unhandled exception, stopping all
> searches [that need to sort by this string field] in their tracks.
> It's not gracefully degrading.
> I think we should simply remove the test, ie, if you have more terms
> than docs then the terms simply overwrite one another.

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