Robert Muir created LUCENE-4291:
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Summary: consider reducing jflex buffer sizes
Key: LUCENE-4291
URL: https://issues.apache.org/jira/browse/LUCENE-4291
Project: Lucene - Core
Issue Type: Task
Components: modules/analysis
Reporter: Robert Muir
Spinoff from SOLR-3684.
Most lucene tokenizers have some buffer size, e.g. in
CharTokenizer/ICUTokenizer its char[4096].
But the jflex tokenizers use char[16384] by default, which seems overkill. I'm
not sure we really see any performance bonus by having such a huge buffer size
as a default.
There is a jflex parameter to set this: I think we should consider reducing it.
In a configuration like solr, tokenizers are reused per-thread-per-field,
so these can easily stack up in RAM.
Additionally CharFilters are not reused so the configuration in e.g.
HtmlStripCharFilter might not be great since its per-document garbage.
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