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From "James Dyer (JIRA)" <j...@apache.org>
Subject [jira] [Updated] (SOLR-2462) Using spellcheck.collate can result in extremely high memory usage
Date Mon, 06 Jun 2011 15:10:58 GMT

     [ https://issues.apache.org/jira/browse/SOLR-2462?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
]

James Dyer updated SOLR-2462:
-----------------------------

    Attachment: SOLR-2462.patch

I guess I should have run that one myself too.  This test is very similar to the ones in SpellCheckCollatorTest.
 I guess while the ones in SCCT test whether or not it can collate properly, TSCR checks that
the response it sends back is proper.

In any case, this is just another one of my brittle tests!  Because we're using a different
comparator, results with tied scores don't come back exactly the same as before.  So now this
test needs more than 5 tries to find the 2nd valid collation.  I up'ed it from 5 to 10 and
now it passes.

> 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
>            Assignee: Robert Muir
>            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.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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