FSTSuggester shouldn't OOM on large inputs
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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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