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https://issues.apache.org/jira/browse/SOLR-2462?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13043992#comment-13043992
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Robert Muir commented on SOLR-2462:
-----------------------------------
{quote}
Maybe we can just put a hard limit on the number of possibilities it will
evaluate? It could be really high like a million or something. We could make it
a configurable parameter, something like
"spellcheck.maxCollationPossibilitiesToEval" , but then again that seems silly.
Who would really change it if a million was the default ?
{quote}
Well, I think this sounds much better than being time-based? And you know, use
your best judgement as a default, definitely I'm ok with it as long as its
configurable and has good defaults.
> Using spellcheck.collate can result in extremely high memory usage
> ------------------------------------------------------------------
>
> Key: SOLR-2462
> URL: https://issues.apache.org/jira/browse/SOLR-2462
> Project: Solr
> Issue Type: Bug
> Components: spellchecker
> Affects Versions: 3.1
> Reporter: James Dyer
> Priority: Critical
> Fix For: 3.1.1, 4.0
>
> Attachments: SOLR-2462.patch, SOLR-2462.patch, SOLR-2462.patch,
> SOLR-2462.patch, SOLR-2462.patch, SOLR-2462.patch, SOLR-2462.patch,
> SOLR-2462_3_1.patch
>
>
> When using "spellcheck.collate", class SpellPossibilityIterator creates a
> ranked list of *every* possible correction combination. But if returning
> several corrections per term, and if several words are misspelled, the
> existing algorithm uses a huge amount of memory.
> This bug was introduced with SOLR-2010. However, it is triggered anytime
> "spellcheck.collate" is used. It is not necessary to use any features that
> were added with SOLR-2010.
> We were in Production with Solr for 1 1/2 days and this bug started taking
> our Solr servers down with "infinite" GC loops. It was pretty easy for this
> to happen as occasionally a user will accidently paste the URL into the
> Search box on our app. This URL results in a search with ~12 misspelled
> words. We have "spellcheck.count" set to 15.
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