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From "Chris A. Mattmann (JIRA)" <j...@apache.org>
Subject [jira] [Assigned] (TIKA-2520) OptimaizeLangDetector#loadModels() should not be called for every single langdetect HTTP request
Date Thu, 24 May 2018 20:55:00 GMT

     [ https://issues.apache.org/jira/browse/TIKA-2520?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
]

Chris A. Mattmann reassigned TIKA-2520:
---------------------------------------

    Assignee: Chris A. Mattmann

> OptimaizeLangDetector#loadModels() should not be called for every single langdetect HTTP
request
> ------------------------------------------------------------------------------------------------
>
>                 Key: TIKA-2520
>                 URL: https://issues.apache.org/jira/browse/TIKA-2520
>             Project: Tika
>          Issue Type: Improvement
>          Components: server
>    Affects Versions: 1.16
>            Reporter: Vincent van Donselaar
>            Assignee: Chris A. Mattmann
>            Priority: Minor
>              Labels: performance
>   Original Estimate: 2h
>  Remaining Estimate: 2h
>
> Tika REST server's `/language` resource invokes the relatively heavy `loadModels` operation
for every language detect call:
> {code:title=LanguageResource.java}
> public String detect(final String string) throws IOException {
> 	LanguageResult language = new OptimaizeLangDetector().loadModels().detect(string);
> 	String detectedLang = language.getLanguage();
> 	LOG.info("Detecting language for incoming resource: [{}]", detectedLang);
> 	return detectedLang;
> }
> {code}
> This could be optimized by (lazy?) loading the models only once and keep them in memory.
I assume the `LanguageDetector` is not thread safe, so I expect this requires an ExecutorService
with language detectors.



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