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https://issues.apache.org/jira/browse/LUCENE-4481?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13610654#comment-13610654
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Commit Tag Bot commented on LUCENE-4481:
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[branch_4x commit] Michael McCandless
http://svn.apache.org/viewvc?view=revision&revision=1400635
LUCENE-4481: add back some optos
> AnalyzingSuggester may fail to return correct topN suggestions
> --------------------------------------------------------------
>
> Key: LUCENE-4481
> URL: https://issues.apache.org/jira/browse/LUCENE-4481
> Project: Lucene - Core
> Issue Type: Bug
> Reporter: Michael McCandless
> Assignee: Michael McCandless
> Fix For: 4.1, 5.0
>
> Attachments: LUCENE-4481.patch, LUCENE-4481.patch, LUCENE-4481.patch,
> LUCENE-4481.patch, LUCENE-4481.patch
>
>
> I hit this when working on LUCENE-4480.
> Because AnalyzingSuggester may prune some of the topN paths found by FST's
> Util.TopNSearcher, this means the queue size limit of topN makes the overall
> search inadmissible, ie it may incorrectly prune paths that would have lead
> to a competitive path.
> However, such pruning is rare: it happens only for graph token streams, and
> even then only when competitive analyzed forms share the same surface forms.
> The simplest way to fix this is to make the queue unbounded but this is
> likely a sizable performance hit ... I haven't tested yet. It's even
> possible the way the dups happen (always at the "end" of the suggestion,
> because we tack on 0 byte followed by ord dedup byte) prevent this bug from
> even occurring and so this could all be a false alarm! I have to try to make
> a test case showing it ...
> A cop-out solution would be to expose a separate queueSize or queueMultiplier
> (over the topN) so that if users are affected by this they could crank up the
> queue size or multiplier.
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