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Posted to dev@lucene.apache.org by "Simon Willnauer (JIRA)" <ji...@apache.org> on 2013/08/20 15:59:52 UTC
[jira] [Commented] (LUCENE-5182) FVH can end in very very long
running recursion on phrase highlight
[ https://issues.apache.org/jira/browse/LUCENE-5182?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13744978#comment-13744978 ]
Simon Willnauer commented on LUCENE-5182:
-----------------------------------------
this patch really doesn't fix the actual issue that this alg is freaking crazy and somehow n! of all the positions etc. I am not even sure what the Big-O of this is but this patch just tires to prevent this thing from going totally nuts.
> FVH can end in very very long running recursion on phrase highlight
> -------------------------------------------------------------------
>
> Key: LUCENE-5182
> URL: https://issues.apache.org/jira/browse/LUCENE-5182
> Project: Lucene - Core
> Issue Type: Bug
> Affects Versions: 5.0, 4.4
> Reporter: Simon Willnauer
> Assignee: Simon Willnauer
> Fix For: 5.0, 4.5
>
> Attachments: LUCENE-5182.patch
>
>
> due to the nature of FVH extract logic a simple phrase query can put a FHV into a super long running recursion. I had documents taking literally days to return form the extract phrases logic. I have a test that reproduces the problem and a possible fix. The reason for this is that the FVH never tries to early terminate if a phrase is already way beyond the slop coming from the phrase query. If there is a document with lot of occurrences or two or more terms in the phrase this literally tries to match all possible combinations of the terms in the doc.
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