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https://issues.apache.org/jira/browse/SOLR-2887?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13147897#comment-13147897
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Simon Willnauer commented on SOLR-2887:
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thanks david for moving forward with this. i haven't had time to look closer
into that but my usecase actually needs tons of memory just for building the
fst. - I'd be awesome if we can make this more efficient!
> FSTSuggester shouldn't OOM on large inputs
> ------------------------------------------
>
> Key: SOLR-2887
> URL: https://issues.apache.org/jira/browse/SOLR-2887
> Project: Solr
> Issue Type: Improvement
> Components: spellchecker
> Reporter: Dawid Weiss
> Assignee: Dawid Weiss
> Fix For: 3.5, 4.0
>
>
> Currently the input to FSTSuggester needs to be re-sorted and this is done
> in-memory. Kind of defeats the purpose of the component since everything else
> is super-efficient but we don't even get to that part because of OOMs during
> construction.
> Robert suggested using a spill-to-disk and merge sort on-disk. I suggested
> creating a lucene index and then enumerating terms for automaton construction
> or taking the automaton directly from the index structure (if it isn't
> pruned).
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