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20050527: LDM questions

This archive contains answers to questions sent to Unidata support through mid-2025. Note that the archive is no longer being updated. We provide the archive for reference; many of the answers presented here remain technically correct, even if somewhat outdated. For the most up-to-date information on the use of NSF Unidata software and data services, please consult the Software Documentation first.

  • Subject: 20050527: LDM questions
  • Date: Fri, 27 May 2005 10:54:42 -0600
Gary,

> To: address@hidden
> From: "Gary Skaggs" <address@hidden>
> Subject: LDM questions
> Organization: NOAA-NSSL / OU-CIMMS
> Keywords: 200505241448.j4OEmfP3001417

The above message contained the following:

> I have some neophyte quesitons for you regarding LDM stats. This relates 
> to version 6.0.14.
> 
> In regards to rtstats, it is my understanding that "time of ingestion of 
> recently received product" is the original timestamp of the ingesting 
> system.

That's correct.

> It is unclear to me what the "Time of queue insertion of received 
> product" really means. Is that the time of completion on the local 
> machine receiving the stream? Is it the time of completion of ingestion 
> on the originating machine? Or is it something in between?

The "time of queue insertion of received product" is the time at which
the data-product was inserted into the local product-queue on the local
system.  This time is kept in the product-queue and is only available on
the local system.  This time should increase as a data-product is
distributed.

> For instance, using the current NWS Level II implementation, the data is 
> ingested at the local forecast office, routed through a server at the 
> Regional Headquarters offices and then on the IRaDS at OU, to Purdue and 
> to ERC. If I am looking at logs for IRaDS, would the "ingest" time be 
> when it was ingested at the Local FO

Yes.

> and the "insertion" time be when 
> the file has been received complete at IRaDS?

Yes, if the "insertion time" that's being observed is from the IRaDS system.

> I really did look through the documentation on the Unidata website, but 
> at the end of my search, I was still uncertain. Thanks for helping a 
> beginner.

No problem.  It's why we're here.

Feel free to contact me if this doesn't clear things up.

> Gary Skaggs
> NSSL
> 
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Regards,
Steve Emmerson
LDM Developer

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