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https://issues.apache.org/jira/browse/LUCENE-4291?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13429198#comment-13429198
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Steven Rowe commented on LUCENE-4291:
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+1.
For tokenizers, the buffer needs to be able to hold a token (and its trailing
context, if lookahead is used), but nothing more. 16k tokens are likely
extremely rare. 4k seems reasonable to me - it's still way bigger than most
people are likely to hit over normal text input.
{{HTMLStripCharFilter}} is a bit different, since it buffers HTML constructs
rather than tokens. In the face of malformed input (e.g. an opening angle
bracket '<' with no closing angle bracket '>'), the scanner might buffer the
entire remaining input. In contrast, {{LegacyHTMLStripCharFilter}}, the
pre-JFlex implementation, limits this kind of buffering, to 8k max chars IIRC.
> 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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