Running TAP/async jobs immediately

[Brian Major]

Hi grid, dal,

I'm restarting the conversation originally posted by Walter here:

    http://mail.ivoa.net/pipermail/dal/2016-September/007593.html

The request is for this to be a requirement for TAP services.

UWS mentions this ability as a "possibility", but has no strong wording on
the matter.

I believe that having the ability to start asynchronous jobs on the initial
job posting could be useful when one is uncertain about the amount of time
it will take to execute the job.  This applies to TAP because queries are
tough to estimate.  However, there are some questions to be answered:

1)  Would this use case be applicable to all applications of UWS, or is it
more of a TAP specific issue?

2)  Similarly, would such a feature belong in UWS or TAP?

2)  How do implementers feel about possibly updating their TAP (and perhaps
other) services to do this?

3)  Does having such a feature outweigh having more required functionality
in UWS (or TAP) services?  Or is it too small a change to cause
inconvenience?

Your thoughts on this would be appreciated.

Regards,
Brian
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