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https://issues.apache.org/jira/browse/LUCENE-5182?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13744984#comment-13744984
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Robert Muir commented on LUCENE-5182:
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It seems to me this patch will solve the issue for low slop values, but for
higher slop values there might be the same trouble right?
Maybe there can be a hard upper bound on this: is there some existing limit in
this highlighter that can bound the slop (e.g. like the maximum number of words
that can be in a snippet or something?) Failing that, maybe a separate
configurable limit?
> 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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