[jira] [Resolved] (TIKA-780) Optimize loading of the media type registry

["Jukka Zitting (Resolved) (JIRA)" <ji...@apache.org>]

     [ https://issues.apache.org/jira/browse/TIKA-780?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]

Jukka Zitting resolved TIKA-780.
--------------------------------

       Resolution: Fixed
    Fix Version/s: 1.1
         Assignee: Jukka Zitting

With various refactorings I was able to significantly speed up the following benchmark:

{code}
long a = System.nanoTime();
new Tika();
long b = System.nanoTime();
for (int i = 0; i < 100; i++) {
    new Tika();
}
long c = System.nanoTime();
{code}

The average time between a and b (i.e. initial loading of the default configuration) is down from 655ms to 377ms on my computer. It looks like any further improvements would probably require precompiling the tika-mimetypes.xml file to another format to avoid the XML parsing overhead. That's a topic for another issue.

And thanks to the fact that the default media type registry is now memorized at first load, the average time for creating a hundred more default Tika instances went down from 4277ms to just 43ms!
                
> Optimize loading of the media type registry
> -------------------------------------------
>
>                 Key: TIKA-780
>                 URL: https://issues.apache.org/jira/browse/TIKA-780
>             Project: Tika
>          Issue Type: Improvement
>          Components: mime
>            Reporter: Jukka Zitting
>            Assignee: Jukka Zitting
>             Fix For: 1.1
>
>
> Parsing of our pretty large media type registry takes quite a while (hundreds of milliseconds), which can be a problem for some applications. There's a lot of ways in which we could optimize the loading of the type registry.

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