Using spellcheck.collate can result in extremely high memory usage
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Key: SOLR-2462
URL: https://issues.apache.org/jira/browse/SOLR-2462
Project: Solr
Issue Type: Bug
Components: spellchecker
Affects Versions: 3.1, 4.0
Reporter: James Dyer
Priority: Critical
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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