Re: Questions about OODT

[Christian Alan Mattmann <ma...@usc.edu>]

Hi Kang,

Thanks for your questions. They are answered below:


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Chris Mattmann, Ph.D.
Adjunct Associate Professor, Computer Science Department
University of Southern California
Los Angeles, CA 90089 USA
Email: mattmann@usc.edu
WWW: http://sunset.usc.edu/~mattmann/
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-----Original Message-----
From: Kang Wang <ka...@usc.edu>
Date: Wednesday, October 29, 2014 at 12:16 AM
To: Chris Mattmann <ma...@usc.edu>
Subject: Questions about OODT

>Hi, pf Chris
>
>
>I have two questions about using OODT.
>
>
>1. What is product in OODT?
>    Is a single json file is a product or whole dataset is a product?
>    I don't know for --productStructure we should use Flat file or
>directory.

For the purposes of this assignment, consider a ³product² to be a JSON
file,
a single instance of it. Just use the Flat structure.

>
>
>2. Should we create .met metadata file?
>    I means in job posting josn file, it has already contained job
>posting metadata, 
>    why we need to establish metadata file again?
>    Does metadata file is for mapping metadata of job posting json to
>elements defined in product-type?
>    If we need to create .met file, how to customize metadata file? I
>just see the following
>    snippet about .met file.
>blah.txt.met
><cas:metadata
> xmlns:cas="http://oodt.jpl.nasa.gov/1.0/cas"
><http://oodt.jpl.nasa.gov/1.0/cas>>
></cas:metadata>
>

Yep you need this .met file since OODT uses that to index it in the File
Manager.

Cheers,
Chris

>
>
>
>
>
>Best Regards,
>Kang
>
>
>