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From "Mattmann, Chris A (388J)" <chris.a.mattm...@jpl.nasa.gov>
Subject Re: Query-CAS thread
Date Sun, 15 Jan 2012 19:06:06 GMT
Hi BW,

On Jan 15, 2012, at 8:33 AM, B W wrote:

> What are the circumstances for which CAS becomes is involved in a Query?

Typically CAS is queried by any of the following use cases:

1. An operator/user is searching for data to download, browse metadata for, etc.
They typically do this through our web applications (CAS Browser, CAS Curator, 
OPSUI, etc.).

2. In an automated fashion, the CAS PGE task wrapper queries the File Manager
portion of CAS to determine files to stage, deliver, and their associated metadata.

3. By the Push Pull system and by the Crawler to determine Product uniqueness.

...and some others.

> When the Query includes observation events that have been registered with
> CAS in some time frame in the past?

That's one of the use cases, yes, per the above.


Chris Mattmann, Ph.D.
Senior Computer Scientist
NASA Jet Propulsion Laboratory Pasadena, CA 91109 USA
Office: 171-266B, Mailstop: 171-246
Email: chris.a.mattmann@nasa.gov
WWW:   http://sunset.usc.edu/~mattmann/
Adjunct Assistant Professor, Computer Science Department
University of Southern California, Los Angeles, CA 90089 USA

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