[jira] [Resolved] (TIKA-2520) OptimaizeLangDetector#loadModels() should not be called for every single langdetect HTTP request

["Chris A. Mattmann (JIRA)" <ji...@apache.org>]

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

Chris A. Mattmann resolved TIKA-2520.
-------------------------------------
       Resolution: Fixed
    Fix Version/s: 1.19

{noformat}

nonas:tika2.0.0 mattmann$ git push -u origin branch_1x

Counting objects: 14, done.

Delta compression using up to 4 threads.

Compressing objects: 100% (10/10), done.

Writing objects: 100% (14/14), 1.72 KiB | 252.00 KiB/s, done.

Total 14 (delta 4), reused 0 (delta 0)

remote: Resolving deltas: 100% (4/4), completed with 4 local objects.

To github.com:/apache/tika.git

   cdca0f726..7e3e34caf  branch_1x -> branch_1x

Branch 'branch_1x' set up to track remote branch 'branch_1x' from 'origin'.

nonas:tika2.0.0 mattmann${noformat}

> 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
>             Fix For: 1.19
>
>   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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